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e4be55bce7
Canonicalize the case when a scalar extracted from a vector is truncated. Transform such cases to bitcast-then-extractelement. This will enable erasing the truncate operation. This commit fixes PR45314. reviewers: spatel Differential revision: https://reviews.llvm.org/D76983
26 lines
767 B
LLVM
26 lines
767 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S -o - | FileCheck %s
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define i32 @a(<4 x i64> %I) {
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; CHECK-LABEL: @a(
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast <4 x i64> [[I:%.*]] to <8 x i32>
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; CHECK-NEXT: [[K:%.*]] = extractelement <8 x i32> [[TMP1]], i32 6
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; CHECK-NEXT: ret i32 [[K]]
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;
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%J = trunc <4 x i64> %I to <4 x i32>
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%K = extractelement <4 x i32> %J, i32 3
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ret i32 %K
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}
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define i32 @b(<4 x float> %I) {
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; CHECK-LABEL: @b(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x float> [[I:%.*]], i32 3
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; CHECK-NEXT: [[K:%.*]] = fptosi float [[TMP1]] to i32
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; CHECK-NEXT: ret i32 [[K]]
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;
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%J = fptosi <4 x float> %I to <4 x i32>
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%K = extractelement <4 x i32> %J, i32 3
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ret i32 %K
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}
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