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[LoopVectorize] Ignore @llvm.assume for cost estimates and legality

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A few minor changes to prevent @llvm.assume from interfering with loop
vectorization. First, treat @llvm.assume like the lifetime intrinsics, which
are scalarized (but don't otherwise interfere with the legality checking).
Second, ignore the cost of ephemeral instructions in the loop (these will go
away anyway during CodeGen).

Alignment assumptions and other uses of @llvm.assume can often end up inside of
loops that should be vectorized (this is not uncommon for assumptions generated
by __attribute__((align_value(n))), for example).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219741 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2014-10-14 22:59:49 +00:00
parent 3a1045d8db
commit 75277b9f70
3 changed files with 133 additions and 4 deletions
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test/Transforms/LoopVectorize/X86/assume.ll
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; RUN: opt < %s -loop-vectorize -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7 -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nounwind uwtable
define void @test1(float* noalias nocapture %a, float* noalias nocapture readonly %b) #0 {
entry:
br label %for.body
; CHECK-LABEL: @test1
; CHECK: vector.body:
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: for.body:
; CHECK: ret void
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds float* %b, i64 %indvars.iv
%0 = load float* %arrayidx, align 4
%cmp1 = fcmp ogt float %0, 1.000000e+02
tail call void @llvm.assume(i1 %cmp1)
%add = fadd float %0, 1.000000e+00
%arrayidx5 = getelementptr inbounds float* %a, i64 %indvars.iv
store float %add, float* %arrayidx5, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv, 1599
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; Function Attrs: nounwind
declare void @llvm.assume(i1) #1
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind }
%struct.data = type { float*, float* }
; Function Attrs: nounwind uwtable
define void @test2(%struct.data* nocapture readonly %d) #0 {
entry:
%b = getelementptr inbounds %struct.data* %d, i64 0, i32 1
%0 = load float** %b, align 8
%ptrint = ptrtoint float* %0 to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
%a = getelementptr inbounds %struct.data* %d, i64 0, i32 0
%1 = load float** %a, align 8
%ptrint2 = ptrtoint float* %1 to i64
%maskedptr3 = and i64 %ptrint2, 31
%maskcond4 = icmp eq i64 %maskedptr3, 0
br label %for.body
; CHECK-LABEL: @test2
; CHECK: vector.body:
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: @llvm.assume
; CHECK: for.body:
; CHECK: ret void
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
tail call void @llvm.assume(i1 %maskcond)
%arrayidx = getelementptr inbounds float* %0, i64 %indvars.iv
%2 = load float* %arrayidx, align 4
%add = fadd float %2, 1.000000e+00
tail call void @llvm.assume(i1 %maskcond4)
%arrayidx5 = getelementptr inbounds float* %1, i64 %indvars.iv
store float %add, float* %arrayidx5, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv, 1599
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}