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X86: teach X86TargetLowering about L,M,O constraints

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Teach the ISelLowering for X86 about the L,M,O target specific constraints.
Although, for the moment, clang performs constraint validation and prevents
passing along inline asm which may have immediate constant constraints violated,
the backend should be able to cope with the invalid inline asm a bit better.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225596 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool 2015-01-11 04:39:24 +00:00
parent 5e3c87ee1a
commit 776673ea09
2 changed files with 59 additions and 0 deletions
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25
lib/Target/X86/X86ISelLowering.cpp
View File

@ -26255,6 +26255,23 @@ void X86TargetLowering::LowerAsmOperandForConstraint(SDValue Op,
}
}
return;
case 'L':
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (C->getZExtValue() == 0xff || C->getZExtValue() == 0xffff ||
(Subtarget->is64Bit() && C->getZExtValue() == 0xffffffff)) {
Result = DAG.getTargetConstant(C->getSExtValue(), Op.getValueType());
break;
}
}
return;
case 'M':
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (C->getZExtValue() <= 3) {
Result = DAG.getTargetConstant(C->getZExtValue(), Op.getValueType());
break;
}
}
return;
case 'N':
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (C->getZExtValue() <= 255) {
@ -26263,6 +26280,14 @@ void X86TargetLowering::LowerAsmOperandForConstraint(SDValue Op,
}
}
return;
case 'O':
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (C->getZExtValue() <= 127) {
Result = DAG.getTargetConstant(C->getZExtValue(), Op.getValueType());
break;
}
}
return;
case 'e': {
// 32-bit signed value
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {

34
test/CodeGen/X86/x86-inline-asm-validation.ll Normal file
View File

@ -0,0 +1,34 @@
; RUN: llc -mtriple i686-gnu -filetype asm -o - %s 2>&1 | FileCheck %s
define void @test_L_ff() {
entry:
call void asm "", "L,~{dirflag},~{fpsr},~{flags}"(i32 255)
ret void
}
; CHECK-NOT: error: invalid operand for inline asm constraint 'L'
define void @test_L_ffff() {
entry:
call void asm "", "L,~{dirflag},~{fpsr},~{flags}"(i32 65535)
ret void
}
; CHECK-NOT: error: invalid operand for inline asm constraint 'L'
define void @test_M_1() {
entry:
call void asm "", "M,~{dirflag},~{fpsr},~{flags}"(i32 1)
ret void
}
; CHECK-NOT: error: invalid operand for inline asm constraint 'M'
define void @test_O_64() {
entry:
call void asm "", "O,~{dirflag},~{fpsr},~{flags}"(i32 64)
ret void
}
; CHECK-NOT: error: invalid operand for inline asm constraint 'O'