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annotate test/CodeGen/X86/tail-call-legality.ll @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 95c75e76d11b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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121
803732b1fca8 LLVM 5.0
kono
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1 ; RUN: llc -mtriple=i686-- -o - < %s | FileCheck %s
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2
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3 ; This used to be classified as a tail call because of a mismatch in the
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4 ; arguments seen by Analysis.cpp and ISelLowering. As seen by ISelLowering, they
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5 ; both return {i32, i32, i32} (since i64 is illegal) which is fine for a tail
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6 ; call.
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8 ; As seen by Analysis.cpp: i64 -> i32 is a valid trunc, second i32 passes
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9 ; straight through and the third is undef, also OK for a tail call.
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10
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11 ; Analysis.cpp was wrong.
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13 ; FIXME: in principle we *could* support some tail calls involving truncations
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14 ; of illegal types: a single "trunc i64 %whatever to i32" is probably valid
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15 ; because of how the extra registers are laid out.
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16
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17 declare {i64, i32} @test()
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18
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19 define {i32, i32, i32} @test_pair_notail(i64 %in) {
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20 ; CHECK-LABEL: test_pair_notail
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21 ; CHECK-NOT: jmp
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22
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23 %whole = tail call {i64, i32} @test()
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24 %first = extractvalue {i64, i32} %whole, 0
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25 %first.trunc = trunc i64 %first to i32
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26
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27 %second = extractvalue {i64, i32} %whole, 1
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28
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29 %tmp = insertvalue {i32, i32, i32} undef, i32 %first.trunc, 0
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30 %res = insertvalue {i32, i32, i32} %tmp, i32 %second, 1
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31 ret {i32, i32, i32} %res
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32 }