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01d89eee39
Alias Analysis allows to detect real barriers for load hoisting. Review in http://reviews.llvm.org/D5991 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221091 91177308-0d34-0410-b5e6-96231b3b80d8
65 lines
2.5 KiB
LLVM
65 lines
2.5 KiB
LLVM
; Test load hoist
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; RUN: opt -basicaa -memdep -mldst-motion -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-pc_linux"
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; Function Attrs: nounwind uwtable
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define float* @foo(i32* noalias nocapture readonly %in, float* noalias %out, i32 %size, i32* nocapture readonly %trigger) {
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entry:
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%cmp11 = icmp eq i32 %size, 0
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br i1 %cmp11, label %for.end, label %for.body.lr.ph
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for.body.lr.ph: ; preds = %entry
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%0 = add i32 %size, -1
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br label %for.body
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; CHECK-LABEL: for.body
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; CHECK: load
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; CHECK: %2 = getelementptr inbounds i32* %in, i64 %indvars.iv
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; CHECK: %3 = load i32* %2, align 4
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for.body: ; preds = %for.body.lr.ph, %for.inc
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%indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.inc ]
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%arrayidx = getelementptr inbounds i32* %trigger, i64 %indvars.iv
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%1 = load i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %1, 0
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br i1 %cmp1, label %if.then, label %if.else
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; CHECK-LABEL: if.then
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if.then: ; preds = %for.body
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; This load should be hoisted
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%arrayidx3 = getelementptr inbounds i32* %in, i64 %indvars.iv
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%2 = load i32* %arrayidx3, align 4
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%conv = sitofp i32 %2 to float
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%add = fadd float %conv, 5.000000e-01
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%arrayidx5 = getelementptr inbounds float* %out, i64 %indvars.iv
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store float %add, float* %arrayidx5, align 4
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br label %for.inc
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if.else: ; preds = %for.body
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%arrayidx7 = getelementptr inbounds float* %out, i64 %indvars.iv
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%3 = load float* %arrayidx7, align 4
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%div = fdiv float %3, 3.000000e+00
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store float %div, float* %arrayidx7, align 4
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; This load should be hoisted in spite of store
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%arrayidx9 = getelementptr inbounds i32* %in, i64 %indvars.iv
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%4 = load i32* %arrayidx9, align 4
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%conv10 = sitofp i32 %4 to float
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%add13 = fadd float %div, %conv10
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store float %add13, float* %arrayidx7, align 4
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br label %for.inc
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for.inc: ; preds = %if.then, %if.else
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv to i32
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%exitcond = icmp ne i32 %lftr.wideiv, %0
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br i1 %exitcond, label %for.body, label %for.cond.for.end_crit_edge
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for.cond.for.end_crit_edge: ; preds = %for.inc
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br label %for.end
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for.end: ; preds = %entry, %for.cond.for.end_crit_edge
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ret float* %out
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}
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