111 lines
3.3 KiB
LLVM
111 lines
3.3 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -hoist-common-insts=1 -S < %s | FileCheck %s --check-prefix=HOIST
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; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -hoist-common-insts=0 -S < %s | FileCheck %s --check-prefix=NOHOIST
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; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s --check-prefix=NOHOIST
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; This example is produced from a very basic C code:
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;
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; void f0();
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; void f1();
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; void f2();
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;
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; void loop(int width) {
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; if(width < 1)
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; return;
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; for(int i = 0; i < width - 1;+i) {
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; f0();
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; f1();
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; }
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; f0();
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; f2();
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; }
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; We have a choice here. We can either
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; * hoist the f0() call into loop header,
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; * which potentially makes loop rotation unprofitable since loop header might
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; have grown above certain threshold, and such unrotated loops will be
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; ignored by LoopVectorizer, preventing vectorization
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; * or loop rotation will succeed, resulting in some weird PHIs that will also
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; harm vectorization
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; * or not hoist f0() call before performing loop rotation,
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; at the cost of potential code bloat and/or potentially successfully rotating
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; the loops, vectorizing them at the cost of compile time.
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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declare i1 @gen1()
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declare void @f0()
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declare void @f1()
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declare void @f2()
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
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define void @_Z4loopi(i1 %cmp) {
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; HOIST-LABEL: @_Z4loopi(
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; HOIST-NEXT: entry:
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; HOIST-NEXT: br i1 [[CMP:%.*]], label [[RETURN:%.*]], label [[FOR_COND:%.*]]
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; HOIST: for.cond:
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; HOIST-NEXT: [[CMP1:%.*]] = call i1 @gen1()
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; HOIST-NEXT: call void @f0()
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; HOIST-NEXT: br i1 [[CMP1]], label [[FOR_BODY:%.*]], label [[FOR_END:%.*]]
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; HOIST: for.body:
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; HOIST-NEXT: call void @f1()
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; HOIST-NEXT: br label [[FOR_COND]]
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; HOIST: for.end:
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; HOIST-NEXT: call void @f2()
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; HOIST-NEXT: br label [[RETURN]]
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; HOIST: return:
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; HOIST-NEXT: ret void
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;
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; NOHOIST-LABEL: @_Z4loopi(
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; NOHOIST-NEXT: entry:
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; NOHOIST-NEXT: br i1 [[CMP:%.*]], label [[RETURN:%.*]], label [[FOR_COND:%.*]]
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; NOHOIST: for.cond:
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; NOHOIST-NEXT: [[CMP1:%.*]] = call i1 @gen1()
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; NOHOIST-NEXT: br i1 [[CMP1]], label [[FOR_BODY:%.*]], label [[FOR_END:%.*]]
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; NOHOIST: for.body:
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; NOHOIST-NEXT: call void @f0()
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; NOHOIST-NEXT: call void @f1()
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; NOHOIST-NEXT: br label [[FOR_COND]]
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; NOHOIST: for.end:
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; NOHOIST-NEXT: call void @f0()
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; NOHOIST-NEXT: call void @f2()
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; NOHOIST-NEXT: br label [[RETURN]]
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; NOHOIST: return:
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; NOHOIST-NEXT: ret void
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;
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entry:
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br i1 %cmp, label %if.then, label %if.end
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if.then:
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br label %return
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if.end:
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br label %for.cond
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for.cond:
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%cmp1 = call i1 @gen1()
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br i1 %cmp1, label %for.body, label %for.cond.cleanup
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for.cond.cleanup:
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br label %for.end
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for.body:
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call void @f0()
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call void @f1()
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br label %for.inc
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for.inc:
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br label %for.cond
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for.end:
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call void @f0()
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call void @f2()
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br label %return
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return:
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ret void
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}
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