derek.holloway
7502bf64a4
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50 lines
982 B
YAML
50 lines
982 B
YAML
# RUN: llc -mtriple=x86_64 -run-pass=implicit-null-checks %s -o - | FileCheck %s
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--- |
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define i32 @reg-rewrite(ptr %x, i1 %arg) {
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entry:
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br i1 %arg, label %is_null, label %not_null, !make.implicit !0
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is_null:
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ret i32 42
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not_null:
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ret i32 100
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}
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!0 = !{}
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...
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---
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# Check that the TEST instruction is replaced with
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# FAULTING_OP only if there are no instructions
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# between the TEST and conditional jump
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# that clobber the register used in TEST.
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name: reg-rewrite
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alignment: 16
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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi' }
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body: |
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bb.0.entry:
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liveins: $rdi
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TEST64rr $rdi, $rdi, implicit-def $eflags
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; CHECK-LABEL: bb.0.entry
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; CHECK-NOT: FAULTING_OP
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renamable $rdi = MOV64ri 5000
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JCC_1 %bb.2, 4, implicit $eflags
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bb.1.not_null:
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liveins: $rdi, $rsi
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$rax = MOV64rm renamable $rdi, 1, $noreg, 4, $noreg
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RET64 $eax
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bb.2.is_null:
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$eax = MOV32ri 200
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RET64 $eax
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...
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