| # RUN: llc -mtriple=x86_64 -run-pass=implicit-null-checks %s -o - | FileCheck %s |
| --- | |
| |
| define i32 @reg-rewrite(i32* %x) { |
| entry: |
| br i1 undef, label %is_null, label %not_null, !make.implicit !0 |
| |
| is_null: |
| ret i32 42 |
| |
| not_null: |
| ret i32 100 |
| } |
| |
| !0 = !{} |
| |
| ... |
| --- |
| # Check that the TEST instruction is replaced with |
| # FAULTING_OP only if there are no instructions |
| # between the TEST and conditional jump |
| # that clobber the register used in TEST. |
| name: reg-rewrite |
| |
| alignment: 4 |
| tracksRegLiveness: true |
| liveins: |
| - { reg: '$rdi' } |
| |
| body: | |
| bb.0.entry: |
| liveins: $rdi |
| |
| TEST64rr $rdi, $rdi, implicit-def $eflags |
| ; CHECK-LABEL: bb.0.entry |
| ; CHECK-NOT: FAULTING_OP |
| renamable $rdi = MOV64ri 5000 |
| JE_1 %bb.2, implicit $eflags |
| |
| bb.1.not_null: |
| liveins: $rdi, $rsi |
| |
| $rax = MOV64rm renamable $rdi, 1, $noreg, 4, $noreg |
| RETQ $eax |
| |
| bb.2.is_null: |
| $eax = MOV32ri 200 |
| RETQ $eax |
| ... |
