[llvm-commits] CVS: llvm/lib/Target/X86/InstSelectSimple.cpp
Misha Brukman
brukman at cs.uiuc.edu
Wed Dec 4 13:24:01 PST 2002
Changes in directory llvm/lib/Target/X86:
InstSelectSimple.cpp updated: 1.49 -> 1.50
---
Log message:
Adjust the stack pointer after a function call, proportional to the number of
arguments pushed onto the stack.
---
Diffs of the changes:
Index: llvm/lib/Target/X86/InstSelectSimple.cpp
diff -u llvm/lib/Target/X86/InstSelectSimple.cpp:1.49 llvm/lib/Target/X86/InstSelectSimple.cpp:1.50
--- llvm/lib/Target/X86/InstSelectSimple.cpp:1.49 Wed Dec 4 11:18:30 2002
+++ llvm/lib/Target/X86/InstSelectSimple.cpp Wed Dec 4 13:22:53 2002
@@ -393,6 +393,9 @@
void
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
// the ABI.
for (unsigned i = CI.getNumOperands()-1; i >= 1; --i)
@@ -406,11 +409,13 @@
// then push EAX.
promote32 (X86::EAX, v);
BuildMI (BB, X86::PUSHr32, 1).addReg (X86::EAX);
+ bytesPushed += 4;
break;
case cInt:
case cFloat: {
unsigned Reg = getReg(v);
BuildMI (BB, X86::PUSHr32, 1).addReg(Reg);
+ bytesPushed += 4;
break;
}
default:
@@ -421,6 +426,10 @@
}
// Emit a CALL instruction with PC-relative displacement.
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...
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