The Mips specific inline asm operand modifier 'z' has the
following description in the gnu sources:
Print $0 if operand is zero otherwise print the op normally.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159324 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsAsmPrinter.cpp b/lib/Target/Mips/MipsAsmPrinter.cpp
index 0609241..1c5bb16 100644
--- a/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -323,6 +323,17 @@
return true;
O << MO.getImm() - 1;
return false;
+ case 'z': // $0 if zero, regular printing otherwise
+ {
+ if (MO.getType() != MachineOperand::MO_Immediate)
+ return true;
+ int64_t Val = MO.getImm();
+ if (Val)
+ O << Val;
+ else
+ O << "$0";
+ return false;
+ }
}
}
@@ -335,11 +346,12 @@
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
- return true; // Unknown modifier.
+ return true; // Unknown modifier.
const MachineOperand &MO = MI->getOperand(OpNum);
assert(MO.isReg() && "unexpected inline asm memory operand");
O << "0($" << MipsInstPrinter::getRegisterName(MO.getReg()) << ")";
+
return false;
}