prelegalizercombiner-trivial-arith.mir
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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple aarch64 -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs %s -o - | FileCheck %s
name: right_ident_sub
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x - 0) -> x
;
; CHECK-LABEL: name: right_ident_sub
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: $w0 = COPY %x(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_SUB %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: right_ident_add
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x + 0) -> x
;
; CHECK-LABEL: name: right_ident_add
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: $w0 = COPY %x(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_ADD %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: mul_0
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x * 0) -> 0
;
; CHECK-LABEL: name: mul_0
; CHECK: liveins: $w0
; CHECK: %cst:_(s32) = G_CONSTANT i32 0
; CHECK: $w0 = COPY %cst(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_MUL %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
# FIXME: Probably should be able to replace this.
---
name: mul_0_cant_replace
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x * 0) -> 0
;
; CHECK-LABEL: name: mul_0_cant_replace
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: %cst:_(s32) = G_CONSTANT i32 0
; CHECK: %op:gpr(s32) = G_MUL %x, %cst
; CHECK: $w0 = COPY %op(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:gpr(s32) = G_MUL %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: sdiv_0
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (0 / x) -> 0
;
; CHECK-LABEL: name: sdiv_0
; CHECK: liveins: $w0
; CHECK: %cst:_(s32) = G_CONSTANT i32 0
; CHECK: $w0 = COPY %cst(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_SDIV %cst, %x
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: udiv_0
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (0 / x) -> 0
;
; CHECK-LABEL: name: udiv_0
; CHECK: liveins: $w0
; CHECK: %cst:_(s32) = G_CONSTANT i32 0
; CHECK: $w0 = COPY %cst(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_UDIV %cst, %x
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: srem_0
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (0 % x) -> 0
;
; CHECK-LABEL: name: srem_0
; CHECK: liveins: $w0
; CHECK: %cst:_(s32) = G_CONSTANT i32 0
; CHECK: $w0 = COPY %cst(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_SREM %cst, %x
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: urem_0
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (0 % x) -> 0
;
; CHECK-LABEL: name: urem_0
; CHECK: liveins: $w0
; CHECK: %cst:_(s32) = G_CONSTANT i32 0
; CHECK: $w0 = COPY %cst(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_UREM %cst, %x
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: right_ident_or
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x || 0) -> x
;
; CHECK-LABEL: name: right_ident_or
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: $w0 = COPY %x(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_OR %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: right_ident_xor
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x | 0) -> x
;
; CHECK-LABEL: name: right_ident_xor
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: $w0 = COPY %x(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_XOR %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: right_ident_shl
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x << 0) -> x
;
; CHECK-LABEL: name: right_ident_shl
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: $w0 = COPY %x(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_SHL %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: right_ident_ashr
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x ashr 0) -> x
;
; CHECK-LABEL: name: right_ident_ashr
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: $w0 = COPY %x(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_ASHR %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: right_ident_lshr
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Fold (x lshr 0) -> x
;
; CHECK-LABEL: name: right_ident_lshr
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: $w0 = COPY %x(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 0
%op:_(s32) = G_LSHR %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: dont_fold_sub
tracksRegLiveness: true
body: |
bb.1.entry:
liveins: $w0
; Not an identity, no folding.
;
; CHECK-LABEL: name: dont_fold_sub
; CHECK: liveins: $w0
; CHECK: %x:_(s32) = COPY $w0
; CHECK: %cst:_(s32) = G_CONSTANT i32 1
; CHECK: %op:_(s32) = G_SUB %x, %cst
; CHECK: $w0 = COPY %op(s32)
; CHECK: RET_ReallyLR implicit $w0
%x:_(s32) = COPY $w0
%cst:_(s32) = G_CONSTANT i32 1
%op:_(s32) = G_SUB %x(s32), %cst
$w0 = COPY %op(s32)
RET_ReallyLR implicit $w0
...
---
name: look_through_zext
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0
; CHECK-LABEL: name: look_through_zext
; CHECK: liveins: $x0
; CHECK: %zero:_(s8) = G_CONSTANT i8 0
; CHECK: %zext_zero:_(s64) = G_ZEXT %zero(s8)
; CHECK: $x0 = COPY %zext_zero(s64)
; CHECK: RET_ReallyLR implicit $x0
%zero:_(s8) = G_CONSTANT i8 0
%zext_zero:_(s64) = G_ZEXT %zero(s8)
%c:_(s64) = G_CONSTANT i64 72340172838076673
%mul:_(s64) = G_MUL %c, %zext_zero
$x0 = COPY %mul(s64)
RET_ReallyLR implicit $x0
...