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machine-cse-deadreg.mir
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machine-cse-deadreg.mir
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# RUN: llc -mtriple thumbv6m-arm-none-eabi -run-pass=machine-cse -verify-machineinstrs -o - %s | FileCheck %s
--- |
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv6m-arm-none-eabi"
define i32 @funca(i64 %l1) {
entry:
%l2 = icmp ult i64 %l1, -177673816660004267
%l3 = add i64 %l1, 401100203
%rem.i = select i1 %l2, i64 %l1, i64 %l3
%conv = trunc i64 %rem.i to i32
ret i32 %conv
}
define i32 @funcb(i64 %l1) { ret i32 0 }
...
---
name: funca
tracksRegLiveness: true
liveins:
- { reg: '$r0', virtual-reg: '%0' }
- { reg: '$r1', virtual-reg: '%1' }
constants:
- id: 0
value: i32 401100203
alignment: 4
isTargetSpecific: false
- id: 1
value: i32 41367909
alignment: 4
isTargetSpecific: false
body: |
bb.0.entry:
successors: %bb.1(0x40000000), %bb.2(0x40000000)
liveins: $r0, $r1
%1:tgpr = COPY $r1
%0:tgpr = COPY $r0
%2:tgpr = tLDRpci %const.0, 14, $noreg :: (load 4 from constant-pool)
%3:tgpr, dead $cpsr = tADDrr %0, %2, 14, $noreg
%4:tgpr = tLDRpci %const.1, 14, $noreg :: (load 4 from constant-pool)
%5:tgpr, $cpsr = tADDrr %0, %2, 14, $noreg
%6:tgpr, $cpsr = tADC %1, killed %4, 14, $noreg, implicit $cpsr
tBcc %bb.2, 3, $cpsr
bb.1.entry:
successors: %bb.2(0x80000000)
bb.2.entry:
%7:tgpr = PHI %3, %bb.1, %0, %bb.0
$r0 = COPY %7
tBX_RET 14, $noreg, implicit $r0
# CHECK-LABEL: name: funca
# cpsr def must not be dead
# CHECK: %3:tgpr, $cpsr = tADDrr %0, %2
# CHECK-NOT: %5:tgpr, $cpsr = tADDrr %0, %2
...
---
name: funcb
tracksRegLiveness: true
liveins:
- { reg: '$r0', virtual-reg: '%0' }
- { reg: '$r1', virtual-reg: '%1' }
constants:
- id: 0
value: i32 401100203
alignment: 4
isTargetSpecific: false
- id: 1
value: i32 41367909
alignment: 4
isTargetSpecific: false
body: |
bb.0:
successors: %bb.1(0x40000000), %bb.2(0x40000000)
liveins: $r0, $r1
%1:tgpr = COPY $r1
%0:tgpr = COPY $r0
%2:tgpr = tLDRpci %const.0, 14, $noreg :: (load 4 from constant-pool)
%3:tgpr, dead $cpsr = tADDrr %0, %2, 14, $noreg
%4:tgpr = tLDRpci %const.1, 14, $noreg :: (load 4 from constant-pool)
%5:tgpr, dead $cpsr = tADDrr %0, %2, 14, $noreg
%6:tgpr, $cpsr = tADDrr %1, killed %4, 14, $noreg
tBcc %bb.2, 3, $cpsr
bb.1:
successors: %bb.2(0x80000000)
bb.2:
%7:tgpr = PHI %3, %bb.1, %0, %bb.0
$r0 = COPY %7
tBX_RET 14, $noreg, implicit $r0
# CHECK-LABEL: name: funcb
# cpsr def should be dead
# CHECK: %3:tgpr, dead $cpsr = tADDrr %0, %2
# CHECK-NOT: %5:tgpr, dead $cpsr = tADDrr %0, %2
...