628 lines
16 KiB
LLVM
628 lines
16 KiB
LLVM
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; REQUIRES: asserts
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; RUN: opt -S -basic-aa -licm -ipt-expensive-asserts=true < %s | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -passes='require<opt-remark-emit>,loop(licm)' -ipt-expensive-asserts=true -S %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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declare void @f() nounwind
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declare void @llvm.experimental.guard(i1,...)
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; constant fold on first ieration
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define i32 @test1(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test1(
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entry:
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; CHECK: %i1 = load i32, i32* %a, align 4
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; CHECK-NEXT: br label %for.body
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br label %for.body
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for.body:
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%iv = phi i32 [ 0, %entry ], [ %inc, %continue ]
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%acc = phi i32 [ 0, %entry ], [ %add, %continue ]
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%r.chk = icmp ult i32 %iv, 2000
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br i1 %r.chk, label %continue, label %fail
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continue:
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%inc = add nuw nsw i32 %iv, 1
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%exitcond = icmp eq i32 %inc, 1000
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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; Same as test1, but with a floating point IR and fcmp
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define i32 @test_fcmp(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test_fcmp(
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entry:
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; CHECK: %i1 = load i32, i32* %a, align 4
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; CHECK-NEXT: br label %for.body
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br label %for.body
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for.body:
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%iv = phi float [ 0.0, %entry ], [ %inc, %continue ]
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%acc = phi i32 [ 0, %entry ], [ %add, %continue ]
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%r.chk = fcmp olt float %iv, 2000.0
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br i1 %r.chk, label %continue, label %fail
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continue:
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%inc = fadd float %iv, 1.0
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%exitcond = fcmp ogt float %inc, 1000.0
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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; Count down from a.length w/entry guard
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; TODO: currently unable to prove the following:
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; ule i32 (add nsw i32 %len, -1), %len where len is [0, 512]
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define i32 @test2(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test2(
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entry:
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%len = load i32, i32* %a, align 4, !range !{i32 0, i32 512}
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%is.non.pos = icmp eq i32 %len, 0
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br i1 %is.non.pos, label %fail, label %preheader
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preheader:
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%lenminusone = add nsw i32 %len, -1
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br label %for.body
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for.body:
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%iv = phi i32 [ %lenminusone, %preheader ], [ %dec, %continue ]
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%acc = phi i32 [ 0, %preheader ], [ %add, %continue ]
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%r.chk = icmp ule i32 %iv, %len
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br i1 %r.chk, label %continue, label %fail
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continue:
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; CHECK-LABEL: continue
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; CHECK: %i1 = load i32, i32* %a, align 4
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%dec = add nsw i32 %iv, -1
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%exitcond = icmp eq i32 %dec, 0
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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; trivially true for zero
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define i32 @test3(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test3(
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entry:
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%len = load i32, i32* %a, align 4, !range !{i32 0, i32 512}
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%is.zero = icmp eq i32 %len, 0
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br i1 %is.zero, label %fail, label %preheader
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preheader:
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; CHECK: %i1 = load i32, i32* %a, align 4
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; CHECK-NEXT: br label %for.body
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br label %for.body
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for.body:
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%iv = phi i32 [ 0, %preheader ], [ %inc, %continue ]
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%acc = phi i32 [ 0, %preheader ], [ %add, %continue ]
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%r.chk = icmp ule i32 %iv, %len
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br i1 %r.chk, label %continue, label %fail
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continue:
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%inc = add nuw nsw i32 %iv, 1
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%exitcond = icmp eq i32 %inc, 1000
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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; requires fact length is non-zero
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define i32 @test4(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[A:%.*]], align 4, !range !0
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; CHECK-NEXT: [[IS_ZERO:%.*]] = icmp eq i32 [[LEN]], 0
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; CHECK-NEXT: br i1 [[IS_ZERO]], label [[FAIL:%.*]], label [[PREHEADER:%.*]]
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; CHECK: preheader:
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; CHECK-NEXT: [[I1:%.*]] = load i32, i32* [[A]], align 4
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[PREHEADER]] ], [ [[INC:%.*]], [[CONTINUE:%.*]] ]
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; CHECK-NEXT: [[ACC:%.*]] = phi i32 [ 0, [[PREHEADER]] ], [ [[ADD:%.*]], [[CONTINUE]] ]
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; CHECK-NEXT: [[R_CHK:%.*]] = icmp ult i32 [[IV]], [[LEN]]
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; CHECK-NEXT: br i1 [[R_CHK]], label [[CONTINUE]], label [[FAIL_LOOPEXIT:%.*]]
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; CHECK: continue:
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; CHECK-NEXT: [[ADD]] = add nsw i32 [[I1]], [[ACC]]
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; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[IV]], 1
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; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], 1000
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; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]]
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; CHECK: for.cond.cleanup:
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; CHECK-NEXT: [[ADD_LCSSA:%.*]] = phi i32 [ [[ADD]], [[CONTINUE]] ]
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; CHECK-NEXT: ret i32 [[ADD_LCSSA]]
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; CHECK: fail.loopexit:
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; CHECK-NEXT: br label [[FAIL]]
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; CHECK: fail:
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; CHECK-NEXT: call void @f()
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; CHECK-NEXT: ret i32 -1
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;
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entry:
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%len = load i32, i32* %a, align 4, !range !{i32 0, i32 512}
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%is.zero = icmp eq i32 %len, 0
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br i1 %is.zero, label %fail, label %preheader
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preheader:
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br label %for.body
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for.body:
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%iv = phi i32 [ 0, %preheader ], [ %inc, %continue ]
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%acc = phi i32 [ 0, %preheader ], [ %add, %continue ]
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%r.chk = icmp ult i32 %iv, %len
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br i1 %r.chk, label %continue, label %fail
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continue:
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%inc = add nuw nsw i32 %iv, 1
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%exitcond = icmp eq i32 %inc, 1000
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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; variation on test1 with branch swapped
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define i32 @test-brswap(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test-brswap(
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entry:
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; CHECK: %i1 = load i32, i32* %a, align 4
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; CHECK-NEXT: br label %for.body
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br label %for.body
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for.body:
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%iv = phi i32 [ 0, %entry ], [ %inc, %continue ]
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%acc = phi i32 [ 0, %entry ], [ %add, %continue ]
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%r.chk = icmp ugt i32 %iv, 2000
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br i1 %r.chk, label %fail, label %continue
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continue:
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%inc = add nuw nsw i32 %iv, 1
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%exitcond = icmp eq i32 %inc, 1000
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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define i32 @test-nonphi(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test-nonphi(
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entry:
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br label %for.body
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for.body:
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; CHECK-LABEL: continue
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; CHECK: %i1 = load i32, i32* %a, align 4
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%iv = phi i32 [ 0, %entry ], [ %inc, %continue ]
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%acc = phi i32 [ 0, %entry ], [ %add, %continue ]
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%xor = xor i32 %iv, 72
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%r.chk = icmp ugt i32 %xor, 2000
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br i1 %r.chk, label %fail, label %continue
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continue:
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%inc = add nuw nsw i32 %iv, 1
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%exitcond = icmp eq i32 %inc, 1000
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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define i32 @test-wrongphi(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test-wrongphi(
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entry:
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br label %for.body
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for.body:
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%iv = phi i32 [ 0, %entry ], [ %inc, %continue ]
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%acc = phi i32 [ 0, %entry ], [ %add, %continue ]
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%cond = icmp ult i32 %iv, 500
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br i1 %cond, label %dummy_block1, label %dummy_block2
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dummy_block1:
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br label %dummy_block2
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dummy_block2:
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%wrongphi = phi i32 [11, %for.body], [12, %dummy_block1]
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%r.chk = icmp ugt i32 %wrongphi, 2000
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br i1 %r.chk, label %fail, label %continue
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continue:
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; CHECK-LABEL: continue
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; CHECK: %i1 = load i32, i32* %a, align 4
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%inc = add nuw nsw i32 %iv, 1
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%exitcond = icmp eq i32 %inc, 1000
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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; This works because loop-simplify is run implicitly, but test for it anyways
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define i32 @test-multiple-latch(i32* noalias nocapture readonly %a) nounwind uwtable {
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; CHECK-LABEL: @test-multiple-latch(
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entry:
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; CHECK: %i1 = load i32, i32* %a, align 4
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; CHECK-NEXT: br label %for.body
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br label %for.body
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for.body:
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%iv = phi i32 [ 0, %entry ], [ %inc, %continue1 ], [ %inc, %continue2 ]
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%acc = phi i32 [ 0, %entry ], [ %add, %continue1 ], [ %add, %continue2 ]
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%r.chk = icmp ult i32 %iv, 2000
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br i1 %r.chk, label %continue1, label %fail
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continue1:
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%i1 = load i32, i32* %a, align 4
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%add = add nsw i32 %i1, %acc
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%inc = add nuw nsw i32 %iv, 1
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%cmp = icmp eq i32 %add, 0
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br i1 %cmp, label %continue2, label %for.body
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continue2:
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%exitcond = icmp eq i32 %inc, 1000
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret i32 %add
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fail:
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call void @f()
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ret i32 -1
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}
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define void @test-hoisting-in-presence-of-guards(i1 %c, i32* %p) {
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; CHECK-LABEL: @test-hoisting-in-presence-of-guards
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; CHECK: entry:
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; CHECK: %a = load i32, i32* %p
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; CHECK: %invariant_cond = icmp ne i32 %a, 100
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; CHECK: loop:
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
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%iv.next = add i32 %iv, 1
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%a = load i32, i32* %p
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%invariant_cond = icmp ne i32 %a, 100
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call void (i1, ...) @llvm.experimental.guard(i1 %invariant_cond) [ "deopt"() ]
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%loop_cond = icmp slt i32 %iv.next, 1000
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br i1 %loop_cond, label %loop, label %exit
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exit:
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ret void
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}
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declare void @may_throw() inaccessiblememonly
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|
|
; Test that we can sink a mustexecute load from loop header even in presence of
|
||
|
|
; throwing instructions after it.
|
||
|
|
define void @test_hoist_from_header_01(i32* %p, i32 %n) {
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test_hoist_from_header_01(
|
||
|
|
; CHECK: entry:
|
||
|
|
; CHECK-NEXT: %load = load i32, i32* %p
|
||
|
|
; CHECK-NOT: load i32
|
||
|
|
|
||
|
|
entry:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
|
||
|
|
%dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
|
||
|
|
%load = load i32, i32* %p
|
||
|
|
call void @may_throw()
|
||
|
|
%cond = icmp slt i32 %iv, %n
|
||
|
|
br i1 %cond, label %if.true, label %if.false
|
||
|
|
|
||
|
|
if.true:
|
||
|
|
%a = add i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
if.false:
|
||
|
|
%b = mul i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
backedge:
|
||
|
|
%merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
|
||
|
|
%iv.next = add i32 %iv, %merge
|
||
|
|
%loop.cond = icmp ult i32 %iv.next, %load
|
||
|
|
br i1 %loop.cond, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
define void @test_hoist_from_header_02(i32* %p, i32 %n) {
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test_hoist_from_header_02(
|
||
|
|
; CHECK: entry:
|
||
|
|
; CHECK-NEXT: %load = load i32, i32* %p
|
||
|
|
; CHECK-NOT: load i32
|
||
|
|
|
||
|
|
entry:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
|
||
|
|
%dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
|
||
|
|
%load = load i32, i32* %p
|
||
|
|
%cond = icmp slt i32 %iv, %n
|
||
|
|
br i1 %cond, label %if.true, label %if.false
|
||
|
|
|
||
|
|
if.true:
|
||
|
|
call void @may_throw()
|
||
|
|
%a = add i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
if.false:
|
||
|
|
%b = mul i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
backedge:
|
||
|
|
%merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
|
||
|
|
%iv.next = add i32 %iv, %merge
|
||
|
|
%loop.cond = icmp ult i32 %iv.next, %load
|
||
|
|
br i1 %loop.cond, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
define void @test_hoist_from_header_03(i32* %p, i32 %n) {
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test_hoist_from_header_03(
|
||
|
|
; CHECK: entry:
|
||
|
|
; CHECK-NEXT: %load = load i32, i32* %p
|
||
|
|
; CHECK-NOT: load i32
|
||
|
|
|
||
|
|
entry:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
|
||
|
|
%dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
|
||
|
|
%load = load i32, i32* %p
|
||
|
|
%cond = icmp slt i32 %iv, %n
|
||
|
|
br i1 %cond, label %if.true, label %if.false
|
||
|
|
|
||
|
|
if.true:
|
||
|
|
%a = add i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
if.false:
|
||
|
|
%b = mul i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
backedge:
|
||
|
|
%merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
|
||
|
|
call void @may_throw()
|
||
|
|
%iv.next = add i32 %iv, %merge
|
||
|
|
%loop.cond = icmp ult i32 %iv.next, %load
|
||
|
|
br i1 %loop.cond, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Check that a throwing instruction prohibits hoisting across it.
|
||
|
|
define void @test_hoist_from_header_04(i32* %p, i32 %n) {
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test_hoist_from_header_04(
|
||
|
|
; CHECK: entry:
|
||
|
|
; CHECK: loop:
|
||
|
|
; CHECK: %load = load i32, i32* %p
|
||
|
|
|
||
|
|
entry:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
|
||
|
|
%dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
|
||
|
|
call void @may_throw()
|
||
|
|
%load = load i32, i32* %p
|
||
|
|
%cond = icmp slt i32 %iv, %n
|
||
|
|
br i1 %cond, label %if.true, label %if.false
|
||
|
|
|
||
|
|
if.true:
|
||
|
|
%a = add i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
if.false:
|
||
|
|
%b = mul i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
backedge:
|
||
|
|
%merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
|
||
|
|
%iv.next = add i32 %iv, %merge
|
||
|
|
%loop.cond = icmp ult i32 %iv.next, %load
|
||
|
|
br i1 %loop.cond, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Check that we can hoist a mustexecute load from backedge even if something
|
||
|
|
; throws after it.
|
||
|
|
define void @test_hoist_from_backedge_01(i32* %p, i32 %n) {
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test_hoist_from_backedge_01(
|
||
|
|
; CHECK: entry:
|
||
|
|
; CHECK-NEXT: %load = load i32, i32* %p
|
||
|
|
; CHECK-NOT: load i32
|
||
|
|
|
||
|
|
entry:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
|
||
|
|
%dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
|
||
|
|
%cond = icmp slt i32 %iv, %n
|
||
|
|
br i1 %cond, label %if.true, label %if.false
|
||
|
|
|
||
|
|
if.true:
|
||
|
|
%a = add i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
if.false:
|
||
|
|
%b = mul i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
backedge:
|
||
|
|
%merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
|
||
|
|
%iv.next = add i32 %iv, %merge
|
||
|
|
%load = load i32, i32* %p
|
||
|
|
call void @may_throw()
|
||
|
|
%loop.cond = icmp ult i32 %iv.next, %load
|
||
|
|
br i1 %loop.cond, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Check that we don't hoist the load if something before it can throw.
|
||
|
|
define void @test_hoist_from_backedge_02(i32* %p, i32 %n) {
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test_hoist_from_backedge_02(
|
||
|
|
; CHECK: entry:
|
||
|
|
; CHECK: loop:
|
||
|
|
; CHECK: %load = load i32, i32* %p
|
||
|
|
|
||
|
|
entry:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
|
||
|
|
%dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
|
||
|
|
%cond = icmp slt i32 %iv, %n
|
||
|
|
br i1 %cond, label %if.true, label %if.false
|
||
|
|
|
||
|
|
if.true:
|
||
|
|
%a = add i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
if.false:
|
||
|
|
%b = mul i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
backedge:
|
||
|
|
%merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
|
||
|
|
%iv.next = add i32 %iv, %merge
|
||
|
|
call void @may_throw()
|
||
|
|
%load = load i32, i32* %p
|
||
|
|
%loop.cond = icmp ult i32 %iv.next, %load
|
||
|
|
br i1 %loop.cond, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
define void @test_hoist_from_backedge_03(i32* %p, i32 %n) {
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test_hoist_from_backedge_03(
|
||
|
|
; CHECK: entry:
|
||
|
|
; CHECK: loop:
|
||
|
|
; CHECK: %load = load i32, i32* %p
|
||
|
|
|
||
|
|
entry:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
|
||
|
|
%dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
|
||
|
|
%cond = icmp slt i32 %iv, %n
|
||
|
|
br i1 %cond, label %if.true, label %if.false
|
||
|
|
|
||
|
|
if.true:
|
||
|
|
%a = add i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
if.false:
|
||
|
|
%b = mul i32 %iv, %iv
|
||
|
|
call void @may_throw()
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
backedge:
|
||
|
|
%merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
|
||
|
|
%iv.next = add i32 %iv, %merge
|
||
|
|
%load = load i32, i32* %p
|
||
|
|
%loop.cond = icmp ult i32 %iv.next, %load
|
||
|
|
br i1 %loop.cond, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
define void @test_hoist_from_backedge_04(i32* %p, i32 %n) {
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test_hoist_from_backedge_04(
|
||
|
|
; CHECK: entry:
|
||
|
|
; CHECK: loop:
|
||
|
|
; CHECK: %load = load i32, i32* %p
|
||
|
|
|
||
|
|
entry:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
|
||
|
|
%dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
|
||
|
|
call void @may_throw()
|
||
|
|
%cond = icmp slt i32 %iv, %n
|
||
|
|
br i1 %cond, label %if.true, label %if.false
|
||
|
|
|
||
|
|
if.true:
|
||
|
|
%a = add i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
if.false:
|
||
|
|
%b = mul i32 %iv, %iv
|
||
|
|
br label %backedge
|
||
|
|
|
||
|
|
backedge:
|
||
|
|
%merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
|
||
|
|
%iv.next = add i32 %iv, %merge
|
||
|
|
%load = load i32, i32* %p
|
||
|
|
%loop.cond = icmp ult i32 %iv.next, %load
|
||
|
|
br i1 %loop.cond, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
ret void
|
||
|
|
}
|