opt_phis2.mir
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# RUN: llc -run-pass opt-phis -march=x86-64 -o - %s | FileCheck %s
# All PHIs should be removed since they can be securely replaced
# by %8 register.
# CHECK-NOT: PHI
--- |
define void @test() {
ret void
}
...
---
name: test
alignment: 16
tracksRegLiveness: true
jumpTable:
kind: block-address
entries:
- id: 0
blocks: [ '%bb.3', '%bb.2', '%bb.1', '%bb.4' ]
body: |
bb.0:
liveins: $edi, $ymm0, $rsi
%9:gr64 = COPY $rsi
%8:vr256 = COPY $ymm0
%7:gr32 = COPY $edi
%11:gr32 = SAR32ri %7, 31, implicit-def dead $eflags
%12:gr32 = SHR32ri %11, 30, implicit-def dead $eflags
%13:gr32 = ADD32rr %7, killed %12, implicit-def dead $eflags
%14:gr32 = AND32ri8 %13, -4, implicit-def dead $eflags
%15:gr32 = SUB32rr %7, %14, implicit-def dead $eflags
%10:gr64_nosp = SUBREG_TO_REG 0, %15, %subreg.sub_32bit
%16:gr32 = SUB32ri8 %15, 3, implicit-def $eflags
JCC_1 %bb.8, 7, implicit $eflags
bb.9:
JMP64m $noreg, 8, %10, %jump-table.0, $noreg :: (load 8 from jump-table)
bb.1:
%0:vr256 = COPY %8
JMP_1 %bb.5
bb.2:
%1:vr256 = COPY %8
JMP_1 %bb.6
bb.3:
%2:vr256 = COPY %8
JMP_1 %bb.7
bb.4:
%3:vr256 = COPY %8
%17:vr128 = VEXTRACTF128rr %8, 1
VPEXTRDmr %9, 1, $noreg, 12, $noreg, killed %17, 2
bb.5:
%4:vr256 = PHI %0, %bb.1, %3, %bb.4
%18:vr128 = VEXTRACTF128rr %4, 1
VPEXTRDmr %9, 1, $noreg, 8, $noreg, killed %18, 1
bb.6:
%5:vr256 = PHI %1, %bb.2, %4, %bb.5
%19:vr128 = VEXTRACTF128rr %5, 1
VMOVPDI2DImr %9, 1, $noreg, 4, $noreg, killed %19
bb.7:
%6:vr256 = PHI %2, %bb.3, %5, %bb.6
%20:vr128 = COPY %6.sub_xmm
VPEXTRDmr %9, 1, $noreg, 0, $noreg, killed %20, 3
bb.8:
RET 0
...