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[BreakFalseDeps] Respect dead blocks.
The pass uses ReachingDefAnalysis which has no information about instructions in dead blocks. So do not process them. Reviewed By: pengfei Differential Revision: https://reviews.llvm.org/D148329
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Serguei Katkov
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Apr 21, 2023
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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 2 | ||
# RUN: llc -run-pass=break-false-deps -verify-machineinstrs %s -o - | FileCheck %s | ||
# | ||
# Check that BreakFalseDeps pass does not crash in presense of dead blocks. | ||
--- | | ||
; ModuleID = 'repro.ll' | ||
target datalayout = "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-f64:32:64-f80:32-n8:16:32-S128" | ||
target triple = "i686-unknown-unknown" | ||
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declare fastcc void @hoge() #0 | ||
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; Function Attrs: nounwind | ||
define fastcc void @widget(i32 %arg) #1 { | ||
bb: | ||
br label %bb1 | ||
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bb1: ; preds = %bb1, %bb | ||
%phi = phi i1 [ true, %bb ], [ false, %bb1 ] | ||
br i1 %phi, label %bb1, label %bb2 | ||
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bb2: ; preds = %bb1 | ||
br i1 %phi, label %bb4, label %bb3 | ||
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bb3: ; preds = %bb2 | ||
ret void | ||
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bb4: ; preds = %bb2 | ||
br label %bb5 | ||
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bb5: ; preds = %bb5, %bb4 | ||
%phi6 = phi double [ 0.000000e+00, %bb4 ], [ %fmul, %bb5 ] | ||
%fptosi = fptosi double %phi6 to i32 | ||
%icmp = icmp slt i32 %fptosi, %arg | ||
%select = select i1 %icmp, i32 %fptosi, i32 0 | ||
%sitofp = sitofp i32 %select to double | ||
%fsub = fsub double 0.000000e+00, %sitofp | ||
%fmul = fmul double 0.000000e+00, %fsub | ||
br label %bb5 | ||
} | ||
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declare fastcc void @quux() #0 | ||
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declare fastcc void @hoge.1() #0 | ||
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declare fastcc void @barney() #0 | ||
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declare fastcc void @ham() #0 | ||
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declare fastcc void @wombat() #0 | ||
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attributes #0 = { "target-features"="+sse2" } | ||
attributes #1 = { nounwind "target-features"="+sse2" } | ||
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... | ||
--- | ||
name: widget | ||
alignment: 16 | ||
exposesReturnsTwice: false | ||
legalized: false | ||
regBankSelected: false | ||
selected: false | ||
failedISel: false | ||
tracksRegLiveness: true | ||
hasWinCFI: false | ||
callsEHReturn: false | ||
callsUnwindInit: false | ||
hasEHCatchret: false | ||
hasEHScopes: false | ||
hasEHFunclets: false | ||
isOutlined: false | ||
debugInstrRef: false | ||
failsVerification: false | ||
tracksDebugUserValues: true | ||
registers: [] | ||
liveins: | ||
- { reg: '$ecx', virtual-reg: '' } | ||
frameInfo: | ||
isFrameAddressTaken: false | ||
isReturnAddressTaken: false | ||
hasStackMap: false | ||
hasPatchPoint: false | ||
stackSize: 0 | ||
offsetAdjustment: 0 | ||
maxAlignment: 1 | ||
adjustsStack: false | ||
hasCalls: false | ||
stackProtector: '' | ||
functionContext: '' | ||
maxCallFrameSize: 0 | ||
cvBytesOfCalleeSavedRegisters: 0 | ||
hasOpaqueSPAdjustment: false | ||
hasVAStart: false | ||
hasMustTailInVarArgFunc: false | ||
hasTailCall: false | ||
localFrameSize: 0 | ||
savePoint: '' | ||
restorePoint: '' | ||
fixedStack: [] | ||
stack: [] | ||
callSites: [] | ||
debugValueSubstitutions: [] | ||
constants: [] | ||
machineFunctionInfo: {} | ||
body: | | ||
; CHECK-LABEL: name: widget | ||
; CHECK: bb.0.bb: | ||
; CHECK-NEXT: successors: %bb.1(0x80000000) | ||
; CHECK-NEXT: liveins: $ecx | ||
; CHECK-NEXT: {{ $}} | ||
; CHECK-NEXT: renamable $al = MOV8ri 1, implicit-def $eax | ||
; CHECK-NEXT: {{ $}} | ||
; CHECK-NEXT: bb.1.bb1 (align 16): | ||
; CHECK-NEXT: successors: %bb.1(0x7c000000), %bb.2(0x04000000) | ||
; CHECK-NEXT: liveins: $eax, $ecx | ||
; CHECK-NEXT: {{ $}} | ||
; CHECK-NEXT: TEST8ri renamable $al, 1, implicit-def $eflags, implicit killed $eax | ||
; CHECK-NEXT: renamable $eax = MOV32ri 0 | ||
; CHECK-NEXT: JCC_1 %bb.1, 5, implicit $eflags | ||
; CHECK-NEXT: {{ $}} | ||
; CHECK-NEXT: bb.2.bb3: | ||
; CHECK-NEXT: RET32 | ||
; CHECK-NEXT: {{ $}} | ||
; CHECK-NEXT: bb.3.bb5: | ||
; CHECK-NEXT: successors: %bb.3(0x80000000) | ||
; CHECK-NEXT: liveins: $eax, $ecx, $xmm0, $xmm1 | ||
; CHECK-NEXT: {{ $}} | ||
; CHECK-NEXT: renamable $edx = nofpexcept CVTTSD2SIrr killed renamable $xmm1, implicit $mxcsr | ||
; CHECK-NEXT: CMP32rr renamable $edx, renamable $ecx, implicit-def $eflags | ||
; CHECK-NEXT: renamable $edx = CMOV32rr killed renamable $edx, renamable $eax, 13, implicit killed $eflags | ||
; CHECK-NEXT: renamable $xmm2 = CVTSI2SDrr killed renamable $edx | ||
; CHECK-NEXT: renamable $xmm1 = XORPSrr undef $xmm1, undef $xmm1 | ||
; CHECK-NEXT: renamable $xmm1 = nofpexcept SUBSDrr killed renamable $xmm1, killed renamable $xmm2, implicit $mxcsr | ||
; CHECK-NEXT: renamable $xmm1 = nofpexcept MULSDrr killed renamable $xmm1, renamable $xmm0, implicit $mxcsr | ||
; CHECK-NEXT: JMP_1 %bb.3 | ||
bb.0.bb: | ||
successors: %bb.1(0x80000000) | ||
liveins: $ecx | ||
renamable $al = MOV8ri 1, implicit-def $eax | ||
bb.1.bb1 (align 16): | ||
successors: %bb.1(0x7c000000), %bb.2(0x04000000) | ||
liveins: $eax, $ecx | ||
TEST8ri renamable $al, 1, implicit-def $eflags, implicit killed $eax | ||
renamable $eax = MOV32ri 0 | ||
JCC_1 %bb.1, 5, implicit $eflags | ||
bb.2.bb3: | ||
RET32 | ||
bb.3.bb5: | ||
successors: %bb.3(0x80000000) | ||
liveins: $eax, $ecx, $xmm0, $xmm1 | ||
renamable $edx = nofpexcept CVTTSD2SIrr killed renamable $xmm1, implicit $mxcsr | ||
CMP32rr renamable $edx, renamable $ecx, implicit-def $eflags | ||
renamable $edx = CMOV32rr killed renamable $edx, renamable $eax, 13, implicit killed $eflags | ||
renamable $xmm2 = CVTSI2SDrr killed renamable $edx | ||
renamable $xmm1 = XORPSrr undef $xmm1, undef $xmm1 | ||
renamable $xmm1 = nofpexcept SUBSDrr killed renamable $xmm1, killed renamable $xmm2, implicit $mxcsr | ||
renamable $xmm1 = nofpexcept MULSDrr killed renamable $xmm1, renamable $xmm0, implicit $mxcsr | ||
JMP_1 %bb.3 | ||
... |