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b4e63ec23a
In the code below on 32-bit targets, x would previously get forwarded to g()
without sign-extension to 32 bits as required by the parameter attribute.
void g(signed short);
void f(unsigned short x) {
g(x);
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262352 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
874 B
LLVM
41 lines
874 B
LLVM
; RUN: llc -mtriple=i686-unknown-linux-gnu -o - %s | FileCheck %s
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declare void @f(i16 signext)
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declare void @g(i32 signext)
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define void @flags_match(i16 signext %x) {
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entry:
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tail call void @f(i16 signext %x)
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ret void
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; The parameter flags match; do the tail call.
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; CHECK-LABEL: flags_match:
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; CHECK: jmp f
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}
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define void @flags_mismatch(i16 zeroext %x) {
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entry:
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tail call void @f(i16 signext %x)
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ret void
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; The parameter flags mismatch. %x has not been sign-extended,
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; so tail call is not possible.
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; CHECK-LABEL: flags_mismatch:
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; CHECK: movswl
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; CHECK: calll f
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}
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define void @mismatch_doesnt_matter(i32 zeroext %x) {
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entry:
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tail call void @g(i32 signext %x)
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ret void
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; The parameter flags mismatch, but the type is wide enough that
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; no extension takes place in practice, so do the tail call.
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; CHECK-LABEL: mismatch_doesnt_matter:
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; CHECK: jmp g
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}
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