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4b218d0f3e
A sequence of additions or multiplications that is known not to wrap, may wrap if it's order is changed (i.e., reassociated). Therefore when vectorizing integer sum or product reductions, their no-wrap flags need to be removed. Fixes PR43828 Patch by Denis Antrushin Differential Revision: https://reviews.llvm.org/D69563
59 lines
1.5 KiB
LLVM
59 lines
1.5 KiB
LLVM
; RUN: opt %s -loop-vectorize -force-vector-interleave=2 -force-vector-width=4 -S | FileCheck %s
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; Fixes PR43828
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define void @test(i32* %B) {
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; CHECK-LABEL: @test(
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; CHECK: vector.body:
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; CHECK-COUNT-2: sub <4 x i32>
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entry:
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br label %outer_loop
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outer_loop:
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%local_4 = phi i32 [ 2, %entry ], [ %4, %outer_tail]
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br label %inner_loop
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inner_loop:
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%local_2 = phi i32 [ 0, %outer_loop ], [ %1, %inner_loop ]
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%local_3 = phi i32 [ -104, %outer_loop ], [ %0, %inner_loop ]
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%0 = sub nuw nsw i32 %local_3, %local_4
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%1 = add nuw nsw i32 %local_2, 1
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%2 = icmp ugt i32 %local_2, 126
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br i1 %2, label %outer_tail, label %inner_loop
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outer_tail:
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%3 = phi i32 [ %0, %inner_loop ]
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store atomic i32 %3, i32 * %B unordered, align 8
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%4 = add i32 %local_4, 1
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%5 = icmp slt i32 %4, 6
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br i1 %5, label %outer_loop, label %exit
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exit:
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ret void
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}
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define i32 @multi-instr(i32* noalias nocapture %A, i32* noalias nocapture %B, i32 %inc) {
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; CHECK-LABEL: @multi-instr(
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; CHECK: vector.body:
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; CHECK-COUNT-4: add <4 x i32>
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entry:
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv_inc, %loop]
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%redu = phi i32 [0, %entry], [%3, %loop]
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%gepa = getelementptr inbounds i32, i32* %A, i32 %iv
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%gepb = getelementptr inbounds i32, i32* %B, i32 %iv
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%0 = load i32, i32* %gepa
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%1 = load i32, i32* %gepb
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%2 = add nuw nsw i32 %redu, %0
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%3 = add nuw nsw i32 %2, %1
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%iv_inc = add nuw nsw i32 %iv, 1
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%4 = icmp ult i32 %iv_inc, 128
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br i1 %4, label %loop, label %exit
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exit:
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%lcssa = phi i32 [%3, %loop]
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ret i32 %lcssa
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}
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