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c174b92fa2
The scalarizer can cache incorrect entries when walking up a chain of insertelement instructions. This occurs when it encounters more than one instruction that it is not actively searching for, as it unconditionally caches every element it finds. The fix is to only cache the first element that it isn't searching for so we don't overwrite correct entries. Reviewers: hfinkel Differential Revision: http://reviews.llvm.org/D11559 llvm-svn: 244448
31 lines
1.0 KiB
LLVM
31 lines
1.0 KiB
LLVM
; RUN: opt -scalarizer -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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; Check that vector element 1 is scalarized correctly from a chain of
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; insertelement instructions
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define void @func(i32 %x) {
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; CHECK-LABEL: @func(
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; CHECK-NOT: phi i32 [ %x, %entry ], [ %inc.pos.y, %loop ]
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; CHECK: phi i32 [ %inc, %entry ], [ %inc.pos.y, %loop ]
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; CHECK: ret void
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entry:
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%vecinit = insertelement <2 x i32> <i32 0, i32 0>, i32 %x, i32 1
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%inc = add i32 %x, 1
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%0 = insertelement <2 x i32> %vecinit, i32 %inc, i32 1
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br label %loop
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loop:
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%pos = phi <2 x i32> [ %0, %entry ], [ %new.pos.y, %loop ]
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%i = phi i32 [ 0, %entry ], [ %new.i, %loop ]
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%pos.y = extractelement <2 x i32> %pos, i32 1
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%inc.pos.y = add i32 %pos.y, 1
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%new.pos.y = insertelement <2 x i32> %pos, i32 %inc.pos.y, i32 1
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%new.i = add i32 %i, 1
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%cmp2 = icmp slt i32 %new.i, 1
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br i1 %cmp2, label %loop, label %exit
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exit:
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ret void
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}
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