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Mark physregs defined by inline asm as implicit.

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This is a bit of a hack to make inline asm look more like call instructions.
It would be better to produce correct dead flags during isel.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105749 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-06-09 20:05:00 +00:00
parent 68fc2daf8f
commit 3013a20684
2 changed files with 23 additions and 2 deletions
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8
lib/CodeGen/SelectionDAG/InstrEmitter.cpp
View File

@ -821,14 +821,18 @@ EmitSpecialNode(SDNode *Node, bool IsClone, bool IsCloned,
case InlineAsm::Kind_RegDef:
for (; NumVals; --NumVals, ++i) {
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();
MI->addOperand(MachineOperand::CreateReg(Reg, true));
// FIXME: Add dead flags for physical and virtual registers defined.
// For now, mark physical register defs as implicit to help fast
// regalloc. This makes inline asm look a lot like calls.
MI->addOperand(MachineOperand::CreateReg(Reg, true,
/*isImp=*/ TargetRegisterInfo::isPhysicalRegister(Reg)));
}
break;
case InlineAsm::Kind_RegDefEarlyClobber:
for (; NumVals; --NumVals, ++i) {
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();
MI->addOperand(MachineOperand::CreateReg(Reg, /*isDef=*/ true,
/*isImp=*/ false,
/*isImp=*/ TargetRegisterInfo::isPhysicalRegister(Reg),
/*isKill=*/ false,
/*isDead=*/ false,
/*isUndef=*/false,

17
test/CodeGen/X86/2010-06-09-FastAllocRegisters.ll Normal file
View File

@ -0,0 +1,17 @@
; RUN: llc < %s -O0 -disable-fp-elim -relocation-model=pic
; PR7313
;
; The inline asm in this function clobbers almost all allocatable registers.
; Make sure that the register allocator recovers.
;
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
declare void @snapshot()
define void @test_too_many_longs() nounwind {
entry:
call void asm sideeffect "xor %rax, %rax\0A\09xor %rbx, %rbx\0A\09xor %rcx, %rcx\0A\09xor %rdx, %rdx\0A\09xor %rsi, %rsi\0A\09xor %rdi, %rdi\0A\09xor %r8, %r8\0A\09xor %r9, %r9\0A\09xor %r10, %r10\0A\09xor %r11, %r11\0A\09xor %r12, %r12\0A\09xor %r13, %r13\0A\09xor %r14, %r14\0A\09xor %r15, %r15\0A\09", "~{fpsr},~{flags},~{r15},~{r14},~{r13},~{r12},~{r11},~{r10},~{r9},~{r8},~{rdi},~{rsi},~{rdx},~{rcx},~{rbx},~{rax}"() nounwind
call void bitcast (void ()* @snapshot to void (i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64, i64)*)(i64 32, i64 33, i64 34, i64 35, i64 36, i64 37, i64 38, i64 39, i64 40, i64 41, i64 42, i64 43) nounwind
ret void
}