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Mips specific inline asm operand modifier 'D'

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Modifier 'D' is to use the second word of a double integer.

We had previously implemented the pure register varient of 
the modifier and this patch implements the memory reference.



#include "stdio.h"

int b[8] = {0,1,2,3,4,5,6,7};
void main()
{
    int i;
    
    // The first word. Notice, no 'D'
    {asm (
    "lw    %0,%1;"
    : "=r" (i)
    : "m" (*(b+4))
    );}
    
    printf("%d\n",i);

    // The second word
    {asm (
    "lw    %0,%D1;"
    : "=r" (i)
    : "m" (*(b+4))
    );}
    
    printf("%d\n",i);
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179135 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jack Carter 2013-04-09 23:19:50 +00:00
parent 7eb0d8148e
commit a9a5c537ad
2 changed files with 26 additions and 3 deletions
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12
lib/Target/Mips/MipsAsmPrinter.cpp
View File

@ -423,12 +423,18 @@ bool MipsAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNum, unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
int Offset = 0;
// Currently we are expecting either no ExtraCode or 'D'
if (ExtraCode) {
if (ExtraCode[0] == 'D')
Offset = 4;
else
return true; // Unknown modifier.
}
const MachineOperand &MO = MI->getOperand(OpNum);
assert(MO.isReg() && "unexpected inline asm memory operand");
O << "0($" << MipsInstPrinter::getRegisterName(MO.getReg()) << ")";
O << Offset << "($" << MipsInstPrinter::getRegisterName(MO.getReg()) << ")";
return false;
}

17
test/CodeGen/Mips/inlineasmmemop.ll
View File

@ -1,5 +1,6 @@
; RUN: llc -march=mipsel < %s | FileCheck %s
; Simple memory
@g1 = external global i32
define i32 @f1(i32 %x) nounwind {
@ -21,3 +22,19 @@ entry:
ret i32 %0
}
; "D": Second word of double word. This works for any memory element.
; CHECK: #APP
; CHECK-NEXT: lw ${{[0-9]+}},4(${{[0-9]+}});
; CHECK-NEXT: #NO_APP
@b = common global [20 x i32] zeroinitializer, align 4
define void @main() #0 {
entry:
tail call void asm sideeffect " lw $0,${1:D};", "r,*m,~{$11}"(i32 undef, i32* getelementptr inbounds ([20 x i32]* @b, i32 0, i32 3)) #1
ret void
}
attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind }