derek.holloway
7502bf64a4
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35 lines
1.4 KiB
LLVM
35 lines
1.4 KiB
LLVM
; RUN: llc -mtriple=thumbv4t-linux-gnueabi -o - %s | FileCheck %s
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; Functions may have more features than the base triple; code generation and
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; instruction selection may be performed based on this information. This test
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; makes sure that the MC layer performs instruction relaxation based on the
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; target-features of the function. The relaxation for tail call is particularly
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; important on Thumb2 as the 16-bit Thumb branch instruction has an extremely
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; short range.
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declare dso_local void @g(...) local_unnamed_addr #2
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define dso_local void @f() local_unnamed_addr #0 {
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entry:
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tail call void @g() #3
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ret void
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}
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; Function has thumb2 target-feature, tail call is allowed and must be widened.
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; CHECK: f:
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; CHECK: b g
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define dso_local void @h() local_unnamed_addr #2 {
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entry:
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tail call void @g() #3
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ret void
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}
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; Function does not have thumb2 target-feature, tail call should not be
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; generated as it cannot be widened.
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; CHECK: h:
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; CHECK: bl g
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attributes #0 = { nounwind "disable-tail-calls"="false" "target-cpu"="cortex-a53" "target-features"="+crypto,+fp-armv8,+neon,+soft-float-abi,+strict-align,+thumb-mode,-crc,-dotprod,-dsp,-hwdiv,-hwdiv-arm,-ras" "use-soft-float"="true" }
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attributes #2 = { nounwind "disable-tail-calls"="false" "target-cpu"="arm7tdmi" "target-features"="+strict-align,+thumb-mode,-crc,-dotprod,-dsp,-hwdiv,-hwdiv-arm,-ras" "use-soft-float"="true" }
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attributes #3 = { nounwind }
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