Mercurial > hg > Members > tobaru > cbc > CbC_llvm
view test/CodeGen/X86/tail-call-legality.ll @ 33:e4204d083e25
LLVM 3.5
author | Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> |
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date | Thu, 12 Dec 2013 14:32:10 +0900 |
parents | 95c75e76d11b |
children | 803732b1fca8 |
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; RUN: llc -march=x86 -o - < %s | FileCheck %s ; This used to be classified as a tail call because of a mismatch in the ; arguments seen by Analysis.cpp and ISelLowering. As seen by ISelLowering, they ; both return {i32, i32, i32} (since i64 is illegal) which is fine for a tail ; call. ; As seen by Analysis.cpp: i64 -> i32 is a valid trunc, second i32 passes ; straight through and the third is undef, also OK for a tail call. ; Analysis.cpp was wrong. ; FIXME: in principle we *could* support some tail calls involving truncations ; of illegal types: a single "trunc i64 %whatever to i32" is probably valid ; because of how the extra registers are laid out. declare {i64, i32} @test() define {i32, i32, i32} @test_pair_notail(i64 %in) { ; CHECK-LABEL: test_pair_notail ; CHECK-NOT: jmp %whole = tail call {i64, i32} @test() %first = extractvalue {i64, i32} %whole, 0 %first.trunc = trunc i64 %first to i32 %second = extractvalue {i64, i32} %whole, 1 %tmp = insertvalue {i32, i32, i32} undef, i32 %first.trunc, 0 %res = insertvalue {i32, i32, i32} %tmp, i32 %second, 1 ret {i32, i32, i32} %res }