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Bug 772830 - Add some regalloc asserts. r=dvander

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This commit is contained in:
Jan de Mooij 2012-11-20 14:08:59 +01:00
parent a8948f4232
commit 03090b1247
1 changed files with 40 additions and 0 deletions
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40
js/src/ion/LinearScan.cpp
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@ -470,6 +470,29 @@ NextInstructionHasFixedUses(LBlock *block, LInstruction *ins)
}
return false;
}
// Returns true iff ins has a def/temp reusing the input allocation.
static bool
IsInputReused(LInstruction *ins, LUse *use)
{
for (size_t i = 0; i < ins->numDefs(); i++) {
if (ins->getDef(i)->policy() == LDefinition::MUST_REUSE_INPUT &&
ins->getOperand(ins->getDef(i)->getReusedInput())->toUse() == use)
{
return true;
}
}
for (size_t i = 0; i < ins->numTemps(); i++) {
if (ins->getTemp(i)->policy() == LDefinition::MUST_REUSE_INPUT &&
ins->getOperand(ins->getTemp(i)->getReusedInput())->toUse() == use)
{
return true;
}
}
return false;
}
#endif
/*
@ -618,6 +641,9 @@ LinearScanAllocator::buildLivenessInfo()
}
}
DebugOnly<bool> hasUseRegister = false;
DebugOnly<bool> hasUseRegisterAtStart = false;
for (LInstruction::InputIterator alloc(**ins); alloc.more(); alloc.next()) {
if (alloc->isUse()) {
LUse *use = alloc->toUse();
@ -637,6 +663,20 @@ LinearScanAllocator::buildLivenessInfo()
for (size_t i = 0; i < ins->numTemps(); i++)
JS_ASSERT(vregs[ins->getTemp(i)].isDouble() != vregs[use].isDouble());
}
// If there are both useRegisterAtStart(x) and useRegister(y)
// uses, we may assign the same register to both operands due to
// interval splitting (bug 772830). Don't allow this for now.
if (use->policy() == LUse::REGISTER) {
if (use->usedAtStart()) {
if (!IsInputReused(*ins, use))
hasUseRegisterAtStart = true;
} else {
hasUseRegister = true;
}
}
JS_ASSERT(!(hasUseRegister && hasUseRegisterAtStart));
#endif
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