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Adjust the stack pointer after a function call, proportional to the number of

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arguments pushed onto the stack.

llvm-svn: 4922
This commit is contained in:
Misha Brukman 2002-12-04 19:22:53 +00:00
parent cf80ad35f3
commit f8634130dc
1 changed files with 9 additions and 0 deletions
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9
lib/Target/X86/InstSelectSimple.cpp
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@ -393,6 +393,9 @@ ISel::visitBranchInst (BranchInst & BI)
void void
ISel::visitCallInst (CallInst & CI) ISel::visitCallInst (CallInst & CI)
{ {
// keep a counter of how many bytes we pushed on the stack
unsigned bytesPushed = 0;
// Push the arguments on the stack in reverse order, as specified by // Push the arguments on the stack in reverse order, as specified by
// the ABI. // the ABI.
for (unsigned i = CI.getNumOperands()-1; i >= 1; --i) for (unsigned i = CI.getNumOperands()-1; i >= 1; --i)
@ -406,11 +409,13 @@ ISel::visitCallInst (CallInst & CI)
// then push EAX. // then push EAX.
promote32 (X86::EAX, v); promote32 (X86::EAX, v);
BuildMI (BB, X86::PUSHr32, 1).addReg (X86::EAX); BuildMI (BB, X86::PUSHr32, 1).addReg (X86::EAX);
bytesPushed += 4;
break; break;
case cInt: case cInt:
case cFloat: { case cFloat: {
unsigned Reg = getReg(v); unsigned Reg = getReg(v);
BuildMI (BB, X86::PUSHr32, 1).addReg(Reg); BuildMI (BB, X86::PUSHr32, 1).addReg(Reg);
bytesPushed += 4;
break; break;
} }
default: default:
@ -421,6 +426,10 @@ ISel::visitCallInst (CallInst & CI)
} }
// Emit a CALL instruction with PC-relative displacement. // Emit a CALL instruction with PC-relative displacement.
BuildMI (BB, X86::CALLpcrel32, 1).addPCDisp (CI.getCalledValue ()); BuildMI (BB, X86::CALLpcrel32, 1).addPCDisp (CI.getCalledValue ());
// Adjust the stack by `bytesPushed' amount if non-zero
if (bytesPushed > 0)
BuildMI (BB, X86::ADDri32, 2).addReg(X86::ESP).addZImm(bytesPushed);
} }
/// visitSimpleBinary - Implement simple binary operators for integral types... /// visitSimpleBinary - Implement simple binary operators for integral types...