4a8e6ed2f7
This patch makes SLP and LV emit operations with initial vectors set to poison constant instead of undef. This is a part of efforts for using poison vector instead of undef to represent "doesn't care" vector. The goal is to make nice shufflevector optimizations valid that is currently incorrect due to the tricky interaction between undef and poison (see https://bugs.llvm.org/show_bug.cgi?id=44185 ). Reviewed By: fhahn Differential Revision: https://reviews.llvm.org/D94061
73 lines
2.6 KiB
LLVM
73 lines
2.6 KiB
LLVM
; RUN: opt -S -mtriple=s390x-unknown-linux -mcpu=z13 -loop-vectorize -dce \
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; RUN: -instcombine -force-vector-width=2 < %s | FileCheck %s
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;
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; Test that loop vectorizer does not generate vector addresses that must then
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; always be extracted.
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; Check that the addresses for a scalarized memory access is not extracted
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; from a vector register.
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define i32 @foo(i32* nocapture %A) {
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;CHECK-LABEL: @foo(
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;CHECK: %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
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;CHECK: %0 = shl nsw i64 %index, 2
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;CHECK: %1 = shl i64 %index, 2
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;CHECK: %2 = or i64 %1, 4
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;CHECK: %3 = getelementptr inbounds i32, i32* %A, i64 %0
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;CHECK: %4 = getelementptr inbounds i32, i32* %A, i64 %2
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;CHECK: store i32 4, i32* %3, align 4
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;CHECK: store i32 4, i32* %4, align 4
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entry:
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br label %for.body
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for.body:
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%0 = shl nsw i64 %indvars.iv, 2
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%arrayidx = getelementptr inbounds i32, i32* %A, i64 %0
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store i32 4, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 10000
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret i32 undef
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}
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; Check that a load of address is scalarized.
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define i32 @foo1(i32* nocapture noalias %A, i32** nocapture %PtrPtr) {
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;CHECK-LABEL: @foo1(
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;CHECK: %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
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;CHECK: %0 = or i64 %index, 1
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;CHECK: %1 = getelementptr inbounds i32*, i32** %PtrPtr, i64 %index
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;CHECK: %2 = getelementptr inbounds i32*, i32** %PtrPtr, i64 %0
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;CHECK: %3 = load i32*, i32** %1, align 8
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;CHECK: %4 = load i32*, i32** %2, align 8
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;CHECK: %5 = load i32, i32* %3, align 4
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;CHECK: %6 = load i32, i32* %4, align 4
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;CHECK: %7 = insertelement <2 x i32> poison, i32 %5, i32 0
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;CHECK: %8 = insertelement <2 x i32> %7, i32 %6, i32 1
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;CHECK: %9 = getelementptr inbounds i32, i32* %A, i64 %index
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;CHECK: %10 = bitcast i32* %9 to <2 x i32>*
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;CHECK: store <2 x i32> %8, <2 x i32>* %10, align 4
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entry:
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br label %for.body
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for.body:
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%ptr = getelementptr inbounds i32*, i32** %PtrPtr, i64 %indvars.iv
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%el = load i32*, i32** %ptr
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%v = load i32, i32* %el
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%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
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store i32 %v, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 10000
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret i32 undef
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}
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