319 lines
7.7 KiB
LLVM
319 lines
7.7 KiB
LLVM
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; RUN: opt < %s -basic-aa -licm -S | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' -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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; Make sure we don't hoist the store out of the loop; %a would
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; have the wrong value if f() unwinds
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define void @test1(i32* nocapture noalias %a, i1 zeroext %y) uwtable {
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entry:
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br label %for.body
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for.body:
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%i.03 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%0 = load i32, i32* %a, align 4
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%add = add nsw i32 %0, 1
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store i32 %add, i32* %a, align 4
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br i1 %y, label %if.then, label %for.inc
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; CHECK: define void @test1
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; CHECK: load i32, i32*
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; CHECK-NEXT: add
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; CHECK-NEXT: store i32
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if.then:
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tail call void @f()
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br label %for.inc
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for.inc:
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%inc = add nuw nsw i32 %i.03, 1
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%exitcond = icmp eq i32 %inc, 10000
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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 void
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}
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; We can hoist the store out of the loop here; if f() unwinds,
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; the lifetime of %a ends.
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define void @test2(i1 zeroext %y) uwtable {
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entry:
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%a = alloca i32
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br label %for.body
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for.body:
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%i.03 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%0 = load i32, i32* %a, align 4
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%add = add nsw i32 %0, 1
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store i32 %add, i32* %a, align 4
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br i1 %y, label %if.then, label %for.inc
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if.then:
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tail call void @f()
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br label %for.inc
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for.inc:
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%inc = add nuw nsw i32 %i.03, 1
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%exitcond = icmp eq i32 %inc, 10000
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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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; CHECK: define void @test2
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; CHECK: store i32
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; CHECK-NEXT: ret void
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ret void
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}
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;; We can promote if the load can be proven safe to speculate, and the
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;; store safe to sink, even if the the store *isn't* must execute.
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define void @test3(i1 zeroext %y) uwtable {
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; CHECK-LABEL: @test3
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entry:
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; CHECK-LABEL: entry:
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; CHECK-NEXT: %a = alloca i32
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; CHECK-NEXT: %a.promoted = load i32, i32* %a, align 4
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%a = alloca i32
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br label %for.body
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for.body:
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%i.03 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%0 = load i32, i32* %a, align 4
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%add = add nsw i32 %0, 1
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tail call void @f()
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store i32 %add, i32* %a, align 4
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%inc = add nuw nsw i32 %i.03, 1
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%exitcond = icmp eq i32 %inc, 10000
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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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; CHECK-LABEL: for.cond.cleanup:
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; CHECK: store i32 %add.lcssa, i32* %a, align 4
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; CHECK-NEXT: ret void
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ret void
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}
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;; Same as test3, but with unordered atomics
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define void @test3b(i1 zeroext %y) uwtable {
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; CHECK-LABEL: @test3
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entry:
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; CHECK-LABEL: entry:
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; CHECK-NEXT: %a = alloca i32
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; CHECK-NEXT: %a.promoted = load atomic i32, i32* %a unordered, align 4
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%a = alloca i32
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br label %for.body
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for.body:
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%i.03 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%0 = load atomic i32, i32* %a unordered, align 4
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%add = add nsw i32 %0, 1
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tail call void @f()
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store atomic i32 %add, i32* %a unordered, align 4
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%inc = add nuw nsw i32 %i.03, 1
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%exitcond = icmp eq i32 %inc, 10000
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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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; CHECK-LABEL: for.cond.cleanup:
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; CHECK: store atomic i32 %add.lcssa, i32* %a unordered, align 4
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; CHECK-NEXT: ret void
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ret void
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}
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@_ZTIi = external constant i8*
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; In this test, the loop is within a try block. There is an explicit unwind edge out of the loop.
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; Make sure this edge is treated as a loop exit, and that the loads and stores are promoted as
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; expected
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define void @loop_within_tryblock() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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%a = alloca i32, align 4
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store i32 0, i32* %a, align 4
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br label %for.cond
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for.cond:
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%cmp = icmp slt i32 %i.0, 1024
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br i1 %cmp, label %for.body, label %for.end
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; CHECK: for.body:
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; CHECK-NOT: load
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; CHECK-NOT: store
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; CHECK: invoke
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for.body:
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%0 = load i32, i32* %a, align 4
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%add = add nsw i32 %0, 1
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store i32 %add, i32* %a, align 4
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invoke void @boo()
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to label %invoke.cont unwind label %lpad
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invoke.cont:
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br label %for.inc
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for.inc:
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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; CHECK: lpad:
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; CHECK: store
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; CHECK: br
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lpad:
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%1 = landingpad { i8*, i32 }
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catch i8* bitcast (i8** @_ZTIi to i8*)
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%2 = extractvalue { i8*, i32 } %1, 0
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%3 = extractvalue { i8*, i32 } %1, 1
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br label %catch.dispatch
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catch.dispatch:
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%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) #3
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%matches = icmp eq i32 %3, %4
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br i1 %matches, label %catch, label %eh.resume
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catch:
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%5 = call i8* @__cxa_begin_catch(i8* %2) #3
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%6 = bitcast i8* %5 to i32*
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%7 = load i32, i32* %6, align 4
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call void @__cxa_end_catch() #3
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br label %try.cont
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try.cont:
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ret void
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for.end:
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br label %try.cont
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eh.resume:
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%lpad.val = insertvalue { i8*, i32 } undef, i8* %2, 0
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%lpad.val3 = insertvalue { i8*, i32 } %lpad.val, i32 %3, 1
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resume { i8*, i32 } %lpad.val3
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}
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; The malloc'ed memory is not capture and therefore promoted.
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define void @malloc_no_capture() #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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%call = call i8* @malloc(i64 4)
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%0 = bitcast i8* %call to i32*
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br label %for.body
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; CHECK: for.body:
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; CHECK-NOT: load
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; CHECK-NOT: store
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; CHECK: br
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for.body:
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.latch ]
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%1 = load i32, i32* %0, align 4
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%add = add nsw i32 %1, 1
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store i32 %add, i32* %0, align 4
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br label %for.call
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for.call:
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invoke void @boo()
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to label %invoke.cont unwind label %lpad
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invoke.cont:
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br label %for.latch
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for.latch:
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%inc = add i32 %i.0, 1
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%cmp = icmp slt i32 %i.0, 1024
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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br label %fun.ret
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lpad:
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%2 = landingpad { i8*, i32 }
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catch i8* null
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%3 = extractvalue { i8*, i32 } %2, 0
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%4 = extractvalue { i8*, i32 } %2, 1
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br label %catch
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catch:
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%5 = call i8* @__cxa_begin_catch(i8* %3) #4
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%6 = bitcast i32* %0 to i8*
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call void @free(i8* %6)
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call void @__cxa_end_catch()
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br label %fun.ret
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fun.ret:
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ret void
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}
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; The malloc'ed memory can be captured and therefore not promoted.
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define void @malloc_capture(i32** noalias %A) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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%call = call i8* @malloc(i64 4)
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%0 = bitcast i8* %call to i32*
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br label %for.body
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; CHECK: for.body:
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; CHECK: load
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; CHECK: store
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; CHECK: br
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for.body:
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.latch ]
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%1 = load i32, i32* %0, align 4
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%add = add nsw i32 %1, 1
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store i32 %add, i32* %0, align 4
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br label %for.call
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for.call:
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invoke void @boo_readnone()
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to label %invoke.cont unwind label %lpad
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invoke.cont:
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br label %for.latch
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for.latch:
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store i32* %0, i32** %A
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%inc = add i32 %i.0, 1
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%cmp = icmp slt i32 %i.0, 1024
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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br label %fun.ret
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lpad:
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%2 = landingpad { i8*, i32 }
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catch i8* null
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%3 = extractvalue { i8*, i32 } %2, 0
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%4 = extractvalue { i8*, i32 } %2, 1
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br label %catch
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catch:
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%5 = call i8* @__cxa_begin_catch(i8* %3) #4
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%6 = bitcast i32* %0 to i8*
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call void @free(i8* %6)
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call void @__cxa_end_catch()
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br label %fun.ret
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fun.ret:
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ret void
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}
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; Function Attrs: nounwind
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declare noalias i8* @malloc(i64)
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; Function Attrs: nounwind
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declare void @free(i8* nocapture)
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declare void @boo()
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; This is an artifical example, readnone functions by definition cannot unwind
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; exceptions by calling the C++ exception throwing methods
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; This function should only be used to test malloc_capture.
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declare void @boo_readnone() readnone
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declare i32 @__gxx_personality_v0(...)
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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declare i32 @llvm.eh.typeid.for(i8*)
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declare void @f() uwtable
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