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| # REQUIRES: asserts
# RUN: llc -mtriple=x86_64-- -run-pass=simple-register-coalescing -late-remat-update-threshold=1 -stats %s -o /dev/null 2>&1 | FileCheck %s
# Check the test will rematerialize for three copies, but will call shrinkToUses
# only once to update live range because of late rematerialization update.
# CHECK: 3 regalloc - Number of instructions re-materialized
# CHECK: 1 regalloc - Number of shrinkToUses called
--- |
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: noreturn uwtable
define void @_Z3fooi(i32 %value) local_unnamed_addr #0 {
entry:
br label %do.body
do.body: ; preds = %do.body, %sw.bb2, %entry
tail call void asm sideeffect "", "~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #2, !srcloc !3
switch i32 %value, label %do.body [
i32 0, label %sw.bb
i32 1, label %sw.bb1
i32 2, label %sw.bb2
]
sw.bb: ; preds = %do.body
tail call void @_Z3gooi(i32 2122)
br label %sw.bb1
sw.bb1: ; preds = %sw.bb, %do.body
tail call void @_Z3gooi(i32 2122)
br label %sw.bb2
sw.bb2: ; preds = %sw.bb1, %do.body
tail call void @_Z3gooi(i32 2122)
br label %do.body
}
declare void @_Z3gooi(i32) local_unnamed_addr #1
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**) #2
attributes #0 = { noreturn uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind }
!llvm.module.flags = !{!0, !1}
!llvm.ident = !{!2}
!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 7, !"PIC Level", i32 2}
!2 = !{!"clang version 7.0.0 (trunk 335057)"}
!3 = !{i32 82}
...
---
name: _Z3fooi
alignment: 16
tracksRegLiveness: true
registers:
- { id: 0, class: gr32 }
- { id: 1, class: gr32 }
- { id: 2, class: gr32 }
- { id: 3, class: gr32 }
- { id: 4, class: gr32 }
- { id: 5, class: gr32 }
liveins:
- { reg: '$edi', virtual-reg: '%0' }
frameInfo:
hasCalls: true
body: |
bb.0.entry:
liveins: $edi
%0:gr32 = COPY killed $edi
%5:gr32 = MOV32ri 2122
bb.1.do.body:
successors: %bb.6(0x15555555), %bb.2(0x6aaaaaab)
INLINEASM &"", 1, 12, implicit-def dead early-clobber $r10, 12, implicit-def dead early-clobber $r11, 12, implicit-def dead early-clobber $r12, 12, implicit-def dead early-clobber $r13, 12, implicit-def dead early-clobber $r14, 12, implicit-def dead early-clobber $r15, 12, implicit-def dead early-clobber $eflags, !3
CMP32ri8 %0, 2, implicit-def $eflags
JCC_1 %bb.6, 4, implicit killed $eflags
JMP_1 %bb.2
bb.2.do.body:
successors: %bb.5(0x19999999), %bb.3(0x66666667)
CMP32ri8 %0, 1, implicit-def $eflags
JCC_1 %bb.5, 4, implicit killed $eflags
JMP_1 %bb.3
bb.3.do.body:
successors: %bb.4(0x20000000), %bb.1(0x60000000)
TEST32rr %0, %0, implicit-def $eflags
JCC_1 %bb.1, 5, implicit killed $eflags
JMP_1 %bb.4
bb.4.sw.bb:
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
$edi = COPY %5
CALL64pcrel32 @_Z3gooi, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp
ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
bb.5.sw.bb1:
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
$edi = COPY %5
CALL64pcrel32 @_Z3gooi, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp
ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
bb.6.sw.bb2:
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
$edi = COPY %5
CALL64pcrel32 @_Z3gooi, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp
ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
JMP_1 %bb.1
...
|