e2a855def5
There was a discrepancy between how SimplifyDemandedBits and computeKnownBits handled the Argument case. computeKnownBits() would use information from range attributes even once the recursion limit has been reached. Fixes https://github.com/llvm/llvm-project/issues/110631.
26 lines
923 B
LLVM
26 lines
923 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -passes=instcombine -instcombine-verify-known-bits < %s | FileCheck %s
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define i16 @pr110631(i32 range(i32 0, 256) %arg, i64 %arg1) {
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; CHECK-LABEL: define i16 @pr110631(
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; CHECK-SAME: i32 range(i32 0, 256) [[ARG:%.*]], i64 [[ARG1:%.*]]) {
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; CHECK-NEXT: [[BB:.*:]]
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; CHECK-NEXT: [[I:%.*]] = xor i32 [[ARG]], 48991
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; CHECK-NEXT: [[TMP0:%.*]] = trunc i64 [[ARG1]] to i32
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; CHECK-NEXT: [[I4:%.*]] = and i32 [[I]], [[TMP0]]
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; CHECK-NEXT: [[TMP1:%.*]] = trunc nuw i32 [[I4]] to i16
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; CHECK-NEXT: [[I8:%.*]] = xor i16 [[TMP1]], 1
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; CHECK-NEXT: ret i16 [[I8]]
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;
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bb:
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%i = xor i32 %arg, 48991
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%i2 = zext i32 %i to i64
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%i3 = and i64 %arg1, %i2
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%i4 = trunc i64 %i3 to i32
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%i5 = trunc i32 %i4 to i16
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%i6 = sext i16 %i5 to i32
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%i7 = xor i32 %i6, 1
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%i8 = trunc i32 %i7 to i16
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ret i16 %i8
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}
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