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The inline asm operand modifier 'n' is suppose

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to be generic across architectures. It has the
following description in the gnu sources:

    Negate the immediate constant

Several Architectures such as x86 have local implementations
of operand modifier 'n' which go beyond the above description
slightly. This won't affect them.

Affected files:

    lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
        Added 'n' to the switch cases.

    test/CodeGen/Generic/asm-large-immediate.ll
        Generic compiled test (x86 for me)

    test/CodeGen/Mips/asm-large-immediate.ll
        Mips compiled version of the generic one

Contributer: Jack Carter



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158939 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jack Carter 2012-06-21 21:37:54 +00:00
parent 2b3e958053
commit 4db98becf7
3 changed files with 12 additions and 4 deletions
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7
lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
View File

@ -420,10 +420,15 @@ bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
default:
return true; // Unknown modifier.
case 'c': // Substitute immediate value without immediate syntax
if ((MO.getType()) != MachineOperand::MO_Immediate)
if (MO.getType() != MachineOperand::MO_Immediate)
return true;
O << MO.getImm();
return false;
case 'n': // Negate the immediate constant.
if (MO.getType() != MachineOperand::MO_Immediate)
return true;
O << -MO.getImm();
return false;
}
}
return true;

5
test/CodeGen/Generic/asm-large-immediate.ll
View File

@ -1,8 +1,11 @@
; RUN: llc < %s | grep 68719476738
; RUN: llc < %s | FileCheck %s
define void @test() {
entry:
; CHECK: /* result: 68719476738 */
tail call void asm sideeffect "/* result: ${0:c} */", "i,~{dirflag},~{fpsr},~{flags}"( i64 68719476738 )
; CHECK: /* result: -68719476738 */
tail call void asm sideeffect "/* result: ${0:n} */", "i,~{dirflag},~{fpsr},~{flags}"( i64 68719476738 )
ret void
}

4
test/CodeGen/Mips/asm-large-immediate.ll
View File

@ -1,10 +1,10 @@
; RUNx: llc -march=mipsel < %s | grep 68719476738
; RUN: llc -march=mipsel < %s | FileCheck %s
define void @test() {
entry:
; CHECK: /* result: 68719476738 */
tail call void asm sideeffect "/* result: ${0:c} */", "i,~{dirflag},~{fpsr},~{flags}"( i64 68719476738 )
; CHECK: /* result: -68719476738 */
tail call void asm sideeffect "/* result: ${0:n} */", "i,~{dirflag},~{fpsr},~{flags}"( i64 68719476738 )
ret void
}