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Don't kill the base register when expanding strd.

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When an strd instruction doesn't get the registers it wants, it can be
expanded into two str instructions. Make sure the first str doesn't kill
the base register in the case where the base and data registers are
identical:

  t2STRi12 %R0<kill>, %R0, 4, pred:14, pred:%noreg
  t2STRi12 %R2<kill>, %R0, 8, pred:14, pred:%noreg

<rdar://problem/11101911>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153611 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-03-28 23:07:03 +00:00
parent dc909bf46b
commit 892143ff70
2 changed files with 19 additions and 0 deletions
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4
lib/Target/ARM/ARMLoadStoreOptimizer.cpp
View File

@ -1184,6 +1184,10 @@ bool ARMLoadStoreOpt::FixInvalidRegPairOp(MachineBasicBlock &MBB,
EvenDeadKill = false;
OddDeadKill = true;
}
// Never kill the base register in the first instruction.
// <rdar://problem/11101911>
if (EvenReg == BaseReg)
EvenDeadKill = false;
InsertLDR_STR(MBB, MBBI, OffImm, isLd, dl, NewOpc,
EvenReg, EvenDeadKill, EvenUndef,
BaseReg, false, BaseUndef, false, OffUndef,

15
test/CodeGen/Thumb2/crash.ll
View File

@ -61,3 +61,18 @@ entry:
declare <4 x float> @llvm.arm.neon.vld1.v4f32(i8*, i32) nounwind readonly
declare void @llvm.arm.neon.vst1.v4f32(i8*, <4 x float>, i32) nounwind
; <rdar://problem/11101911>
; When an strd is expanded into two str instructions, make sure the first str
; doesn't kill the base register. This can happen if the base register is the
; same as the data register.
%class = type { i8*, %class*, i32 }
define void @f11101911(%class* %this, i32 %num) ssp align 2 {
entry:
%p1 = getelementptr inbounds %class* %this, i32 0, i32 1
%p2 = getelementptr inbounds %class* %this, i32 0, i32 2
tail call void asm sideeffect "", "~{r1},~{r3},~{r5},~{r11},~{r13}"() nounwind
store %class* %this, %class** %p1, align 4
store i32 %num, i32* %p2, align 4
ret void
}