diff options
| author | Misha Brukman <brukman+llvm@gmail.com> | 2002-12-04 19:22:53 +0000 |
|---|---|---|
| committer | Misha Brukman <brukman+llvm@gmail.com> | 2002-12-04 19:22:53 +0000 |
| commit | 0d2cf3a533572ee2f4a08f997499d18e41a37176 (patch) | |
| tree | 91f68dc5690eb2b432e47ff11ad300215b65392d | |
| parent | a17a2ac727dec57f08ff2c651fbdf3d780c5ef27 (diff) | |
Adjust the stack pointer after a function call, proportional to the number of
arguments pushed onto the stack.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4922 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/InstSelectSimple.cpp | 9 | ||||
| -rw-r--r-- | lib/Target/X86/X86ISelSimple.cpp | 9 |
2 files changed, 18 insertions, 0 deletions
diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp index 65bfb1c7ed..55bf65b2f5 100644 --- a/lib/Target/X86/InstSelectSimple.cpp +++ b/lib/Target/X86/InstSelectSimple.cpp @@ -393,6 +393,9 @@ ISel::visitBranchInst (BranchInst & BI) 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 @@ ISel::visitCallInst (CallInst & CI) // 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 @@ ISel::visitCallInst (CallInst & CI) } // 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... diff --git a/lib/Target/X86/X86ISelSimple.cpp b/lib/Target/X86/X86ISelSimple.cpp index 65bfb1c7ed..55bf65b2f5 100644 --- a/lib/Target/X86/X86ISelSimple.cpp +++ b/lib/Target/X86/X86ISelSimple.cpp @@ -393,6 +393,9 @@ ISel::visitBranchInst (BranchInst & BI) 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 @@ ISel::visitCallInst (CallInst & CI) // 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 @@ ISel::visitCallInst (CallInst & CI) } // 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... |