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[mips][microMIPS] Fix issue with delay slot filler and microMIPS

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Differential Revision: http://reviews.llvm.org/D6193


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221612 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zoran Jovanovic 2014-11-10 17:27:56 +00:00
parent d2c5947a4c
commit c63c935a80
2 changed files with 37 additions and 11 deletions
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30
lib/Target/Mips/MipsDelaySlotFiller.cpp
View File

@ -497,24 +497,32 @@ getUnderlyingObjects(const MachineInstr &MI,
/// We assume there is only one delay slot per delayed instruction.
bool Filler::runOnMachineBasicBlock(MachineBasicBlock &MBB) {
bool Changed = false;
bool InMicroMipsMode = TM.getSubtarget<MipsSubtarget>().inMicroMipsMode();
for (Iter I = MBB.begin(); I != MBB.end(); ++I) {
if (!hasUnoccupiedSlot(&*I))
continue;
++FilledSlots;
Changed = true;
// For microMIPS, at the moment, do not fill delay slots of call
// instructions.
//
// TODO: Support for replacing regular call instructions with corresponding
// short delay slot instructions should be implemented.
if (!InMicroMipsMode || !I->isCall()) {
++FilledSlots;
Changed = true;
// Delay slot filling is disabled at -O0.
if (!DisableDelaySlotFiller && (TM.getOptLevel() != CodeGenOpt::None)) {
if (searchBackward(MBB, I))
continue;
if (I->isTerminator()) {
if (searchSuccBBs(MBB, I))
// Delay slot filling is disabled at -O0.
if (!DisableDelaySlotFiller && (TM.getOptLevel() != CodeGenOpt::None)) {
if (searchBackward(MBB, I))
continue;
} else if (searchForward(MBB, I)) {
continue;
if (I->isTerminator()) {
if (searchSuccBBs(MBB, I))
continue;
} else if (searchForward(MBB, I)) {
continue;
}
}
}

18
test/CodeGen/Mips/micromips-delay-slot.ll Normal file
View File

@ -0,0 +1,18 @@
; RUN: llc -march=mipsel -mcpu=mips32r2 -mattr=+micromips \
; RUN: -relocation-model=pic -O3 < %s | FileCheck %s
; Function Attrs: nounwind uwtable
define i32 @foo(i32 %a) #0 {
entry:
%a.addr = alloca i32, align 4
store i32 %a, i32* %a.addr, align 4
%0 = load i32* %a.addr, align 4
%shl = shl i32 %0, 2
%call = call i32 @bar(i32 %shl)
ret i32 %call
}
declare i32 @bar(i32) #1
; CHECK: nop