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2251e7272c
Turns out that there was no check for a store that truncates down to a single byte when combining a (store (bswap...)) into a byte-swapping store. This patch just adds that check. Fixes https://bugs.llvm.org/show_bug.cgi?id=39478. llvm-svn: 347288
27 lines
833 B
LLVM
27 lines
833 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=powerpc64le-unknown-unknown -verify-machineinstrs < %s | \
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; RUN: FileCheck %s
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; RUN: llc -mtriple=powerpc64-unknown-unknown -verify-machineinstrs < %s | \
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; RUN: FileCheck %s
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define void @pr39478() {
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; CHECK-LABEL: pr39478:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: lwz 3, 0(3)
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; CHECK-NEXT: stb 3, 0(3)
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; CHECK-NEXT: blr
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entry:
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%tmp32 = load i64, i64* undef, align 8
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%tmp33 = load i32, i32* undef, align 4
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%tmp34 = and i32 %tmp33, -256
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%tmp35 = lshr i64 %tmp32, 32
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%tmp36 = shl nuw nsw i64 %tmp35, 24
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%tmp37 = trunc i64 %tmp36 to i32
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%tmp38 = call i32 @llvm.bswap.i32(i32 %tmp37)
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%tmp39 = or i32 %tmp38, %tmp34
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store i32 %tmp39, i32* undef, align 4
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ret void
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}
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declare i32 @llvm.bswap.i32(i32)
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