126f90b252
extractelement is poison if the index is out-of-bounds, so just scalarizing the load may introduce an out-of-bounds load, which is UB. To avoid introducing new UB, we can mask the index so it only contains valid indices. Fixes PR50382. Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D103077
16 lines
504 B
LLVM
16 lines
504 B
LLVM
; Verify ReplaceExtractVectorEltOfLoadWithNarrowedLoad fixes
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
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; Test a case where a vector extraction can be simplified to a scalar load.
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; The index must be extended from i32 to i64.
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define i32 @f1(<4 x i32> *%ptr, i32 %index) {
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; CHECK-LABEL: f1:
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; CHECK: risbgn {{%r[0-5]}}, %r3, 60, 189, 2
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; CHECK: l %r2,
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; CHECK: br %r14
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%vec = load <4 x i32>, <4 x i32> *%ptr
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%res = extractelement <4 x i32> %vec, i32 %index
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ret i32 %res
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}
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