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The Mips specific inline asm operand modifier 'z' has the

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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
This commit is contained in:
Jack Carter 2012-06-28 01:33:40 +00:00
parent e441394784
commit 7c3cd4d24e
2 changed files with 25 additions and 1 deletions
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14
lib/Target/Mips/MipsAsmPrinter.cpp
View File

@ -323,6 +323,17 @@ bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
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 << "$0";
return false;
}
}
}
@ -335,11 +346,12 @@ bool MipsAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
return true; // Unknown modifier.
const MachineOperand &MO = MI->getOperand(OpNum);
assert(MO.isReg() && "unexpected inline asm memory operand");
O << "0($" << MipsInstPrinter::getRegisterName(MO.getReg()) << ")";
return false;
}

12
test/CodeGen/Mips/inlineasm-operand-code.ll
View File

@ -29,5 +29,17 @@ entry:
;CHECK: #NO_APP
tail call i32 asm sideeffect "addi $0,$1,${2:m}", "=r,r,I"(i32 7, i32 -3) nounwind
; z with -3
;CHECK: #APP
;CHECK: addi ${{[0-9]+}},${{[0-9]+}},-3
;CHECK: #NO_APP
tail call i32 asm sideeffect "addi $0,$1,${2:z}", "=r,r,I"(i32 7, i32 -3) nounwind
; z with 0
;CHECK: #APP
;CHECK: addi ${{[0-9]+}},${{[0-9]+}},$0
;CHECK: #NO_APP
tail call i32 asm sideeffect "addi $0,$1,${2:z}", "=r,r,I"(i32 7, i32 0) nounwind
ret i32 0
}