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19ec2ce1e7
Currently we assign the same value number to two calls reading the same memory location if we do not have MemoryDependence info. Without MemDep Info we cannot guarantee that there is no store between the two calls, so we have to assign a new number to the second call. It also adds a new option EnableMemDep to enable/disable running MemoryDependenceAnalysis and also renamed NoLoads to NoMemDepAnalysis to be more explicit what it does. As it also impacts calls that read memory, NoLoads is a bit confusing. Reviewers: efriedma, sebpop, john.brawn, wmi Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D50893 llvm-svn: 340319
30 lines
1.6 KiB
LLVM
30 lines
1.6 KiB
LLVM
; RUN: opt %s -gvn -S -enable-gvn-memdep=false | FileCheck %s
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; RUN: opt %s -gvn -S -enable-gvn-memdep=true | FileCheck %s
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; Check that llvm.x86.avx2.gather.d.ps.256 intrinsic is not eliminated by GVN
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; with and without memory dependence info.
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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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; Function Attrs: nounwind readonly
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declare <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float>, i8*, <8 x i32>, <8 x float>, i8) #0
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; Function Attrs: nounwind
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define <8 x float> @foo1(i8* noalias readonly %arr.ptr, <8 x i32>* noalias readonly %vix.ptr, i8* noalias %t2.ptr) #1 {
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allocas:
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%vix = load <8 x i32>, <8 x i32>* %vix.ptr, align 4
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%t1.ptr = getelementptr i8, i8* %arr.ptr, i8 4
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%v1 = tail call <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float> undef, i8* %arr.ptr, <8 x i32> %vix, <8 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>, i8 1) #2
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store i8 1, i8* %t1.ptr, align 4
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%v2 = tail call <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float> undef, i8* %arr.ptr, <8 x i32> %vix, <8 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>, i8 1) #2
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%res = fadd <8 x float> %v1, %v2
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ret <8 x float> %res
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}
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; CHECK: foo1
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; CHECK: llvm.x86.avx2.gather.d.ps.256
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; CHECK: store
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; CHECK: llvm.x86.avx2.gather.d.ps.256
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