derek.holloway
7502bf64a4
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33 lines
1.1 KiB
LLVM
33 lines
1.1 KiB
LLVM
; RUN: llc -mtriple=i686-- -o - < %s | FileCheck %s
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; This used to be classified as a tail call because of a mismatch in the
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; arguments seen by Analysis.cpp and ISelLowering. As seen by ISelLowering, they
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; both return {i32, i32, i32} (since i64 is illegal) which is fine for a tail
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; call.
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; As seen by Analysis.cpp: i64 -> i32 is a valid trunc, second i32 passes
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; straight through and the third is undef, also OK for a tail call.
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; Analysis.cpp was wrong.
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; FIXME: in principle we *could* support some tail calls involving truncations
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; of illegal types: a single "trunc i64 %whatever to i32" is probably valid
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; because of how the extra registers are laid out.
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declare {i64, i32} @test()
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define {i32, i32, i32} @test_pair_notail(i64 %in) {
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; CHECK-LABEL: test_pair_notail
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; CHECK-NOT: jmp
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%whole = tail call {i64, i32} @test()
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%first = extractvalue {i64, i32} %whole, 0
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%first.trunc = trunc i64 %first to i32
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%second = extractvalue {i64, i32} %whole, 1
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%tmp = insertvalue {i32, i32, i32} undef, i32 %first.trunc, 0
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%res = insertvalue {i32, i32, i32} %tmp, i32 %second, 1
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ret {i32, i32, i32} %res
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}
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