derek.holloway
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34 lines
1.1 KiB
LLVM
34 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -O1 -mtriple i686-unknown-linux-gnu -o - %s | FileCheck %s
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@foo = global i16 0, align 1
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@aliasFoo = alias i16, ptr @foo
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@bar = global i16 0, align 1
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; This used to miscompile due to not realizing that the store to @aliasFoo
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; clobbered @foo (see PR51878).
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;
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; With some improvements to codegen it should be possible to detect that @foo
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; and @aliasFoo are aliases, and that @aliasFoo isn't aliasing with @bar. So
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; ideally we would end up with three movw instructions here. Running opt
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; before llc on this test case would take care of that, but llc is not smart
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; enough to deduce that itself yet.
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define i16 @main() {
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; CHECK-LABEL: main:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: movw $1, foo
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; CHECK-NEXT: movw $2, bar
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; CHECK-NEXT: movw $4, aliasFoo
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; CHECK-NEXT: movzwl foo, %eax
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; CHECK-NEXT: addw bar, %ax
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; CHECK-NEXT: retl
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entry:
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store i16 1, ptr @foo
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store i16 2, ptr @bar
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store i16 4, ptr @aliasFoo
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%foo = load i16, ptr @foo
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%bar = load i16, ptr @bar
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%res = add i16 %foo, %bar
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ret i16 %res
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}
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