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Don't try to replace physical registers when doing CSE.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97360 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-02-28 01:33:43 +00:00
parent 8772f5041c
commit 6ac33b4533
2 changed files with 51 additions and 1 deletions
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13
lib/CodeGen/MachineLICM.cpp
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@ -458,9 +458,20 @@ bool MachineLICM::EliminateCSE(MachineInstr *MI,
if (const MachineInstr *Dup = LookForDuplicate(MI, CI->second)) {
DEBUG(dbgs() << "CSEing " << *MI << " with " << *Dup);
// Replace virtual registers defined by MI by their counterparts defined
// by Dup.
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
if (MO.isReg() && MO.isDef())
// Physical registers may not differ here.
assert((!MO.isReg() || MO.getReg() == 0 ||
!TargetRegisterInfo::isPhysicalRegister(MO.getReg()) ||
MO.getReg() == Dup->getOperand(i).getReg()) &&
"Instructions with different phys regs are not identical!");
if (MO.isReg() && MO.isDef() &&
!TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
RegInfo->replaceRegWith(MO.getReg(), Dup->getOperand(i).getReg());
}
MI->eraseFromParent();

39
test/CodeGen/X86/licm-symbol.ll Normal file
View File

@ -0,0 +1,39 @@
; RUN: llc < %s | FileCheck %s
; MachineLICM should be able to hoist the sF reference out of the loop.
; CHECK: pushl %esi
; CHECK: subl $8, %esp
; CHECK: movl $176, %esi
; CHECK: addl L___sF$non_lazy_ptr, %esi
; CHECK: .align 4, 0x90
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
target triple = "i386-apple-darwin8"
%struct.FILE = type { i8*, i32, i32, i16, i16, %struct.__sbuf, i32, i8*, i32 (i8*)*, i32 (i8*, i8*, i32)*, i64 (i8*, i64, i32)*, i32 (i8*, i8*, i32)*, %struct.__sbuf, %struct.__sFILEX*, i32, [3 x i8], [1 x i8], %struct.__sbuf, i32, i64 }
%struct.__sFILEX = type opaque
%struct.__sbuf = type { i8*, i32 }
%struct.gcov_ctr_summary = type { i32, i32, i64, i64, i64 }
%struct.gcov_summary = type { i32, [1 x %struct.gcov_ctr_summary] }
@__sF = external global [0 x %struct.FILE] ; <[0 x %struct.FILE]*> [#uses=1]
declare i32 @fprintf(%struct.FILE* nocapture) nounwind
define void @gcov_exit() nounwind {
entry:
br label %bb151
bb151: ; preds = %bb59, %bb56, %bb14
br i1 undef, label %bb56, label %bb59
bb56: ; preds = %bb151
%t0 = call i32 (%struct.FILE*)* @fprintf(%struct.FILE* getelementptr inbounds ([0 x %struct.FILE]* @__sF, i32 0, i32 2)) nounwind
br label %bb151
bb59: ; preds = %bb151
%t1 = call i32 (%struct.FILE*)* @fprintf(%struct.FILE* getelementptr inbounds ([0 x %struct.FILE]* @__sF, i32 0, i32 2)) nounwind
br label %bb151
}