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Turn some fp stackifier assertion into errors to avoid silently generating bad code when assertions are off. rdar://8540457.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116368 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-10-12 23:19:28 +00:00
parent 2a6a93d542
commit 3f490f3469
1 changed files with 14 additions and 7 deletions
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21
lib/Target/X86/X86FloatingPoint.cpp
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@ -167,7 +167,8 @@ namespace {
/// getStackEntry - Return the X86::FP<n> register in register ST(i).
unsigned getStackEntry(unsigned STi) const {
assert(STi < StackTop && "Access past stack top!");
if (STi >= StackTop)
report_fatal_error("Access past stack top!");
return Stack[StackTop-1-STi];
}
@ -180,7 +181,8 @@ namespace {
// pushReg - Push the specified FP<n> register onto the stack.
void pushReg(unsigned Reg) {
assert(Reg < 8 && "Register number out of range!");
assert(StackTop < 8 && "Stack overflow!");
if (StackTop >= 8)
report_fatal_error("Stack overflow!");
Stack[StackTop] = Reg;
RegMap[Reg] = StackTop++;
}
@ -197,7 +199,8 @@ namespace {
std::swap(RegMap[RegNo], RegMap[RegOnTop]);
// Swap stack slot contents.
assert(RegMap[RegOnTop] < StackTop);
if (RegMap[RegOnTop] >= StackTop)
report_fatal_error("Access past stack top!");
std::swap(Stack[RegMap[RegOnTop]], Stack[StackTop-1]);
// Emit an fxch to update the runtime processors version of the state.
@ -824,7 +827,8 @@ void FPS::popStackAfter(MachineBasicBlock::iterator &I) {
MachineInstr* MI = I;
DebugLoc dl = MI->getDebugLoc();
ASSERT_SORTED(PopTable);
assert(StackTop > 0 && "Cannot pop empty stack!");
if (StackTop == 0)
report_fatal_error("Cannot pop empty stack!");
RegMap[Stack[--StackTop]] = ~0; // Update state
// Check to see if there is a popping version of this instruction...
@ -1016,7 +1020,8 @@ void FPS::handleOneArgFP(MachineBasicBlock::iterator &I) {
MI->getOpcode() == X86::ISTT_FP32m ||
MI->getOpcode() == X86::ISTT_FP64m ||
MI->getOpcode() == X86::ST_FP80m) {
assert(StackTop > 0 && "Stack empty??");
if (StackTop == 0)
report_fatal_error("Stack empty??");
--StackTop;
} else if (KillsSrc) { // Last use of operand?
popStackAfter(I);
@ -1047,7 +1052,8 @@ void FPS::handleOneArgFPRW(MachineBasicBlock::iterator &I) {
// If this is the last use of the source register, just make sure it's on
// the top of the stack.
moveToTop(Reg, I);
assert(StackTop > 0 && "Stack cannot be empty!");
if (StackTop == 0)
report_fatal_error("Stack cannot be empty!");
--StackTop;
pushReg(getFPReg(MI->getOperand(0)));
} else {
@ -1341,7 +1347,8 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
std::swap(RegMap[RegNo], RegMap[RegOnTop]);
// Swap stack slot contents.
assert(RegMap[RegOnTop] < StackTop);
if (RegMap[RegOnTop] >= StackTop)
report_fatal_error("Access past stack top!");
std::swap(Stack[RegMap[RegOnTop]], Stack[StackTop-1]);
break;
}