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Reapply "Fix crash on inline asm with 64bit matching input in 32bit GPR" 

This reapplies commit r338206 reverted by r338214 since the bug that
r338206 uncovered has been fixed in r338268.

Add support for inline assembly with matching input operand that do not
naturally go in the register class it is constrained to (eg. double in a
32-bit GPR). Note that regular input is already handled by existing
code.

llvm-svn: 338269
This commit is contained in:
Thomas Preud'homme 2018-07-30 16:48:39 +00:00
parent 6c1b075299
commit 196149c943
2 changed files with 103 additions and 9 deletions
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32
llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -7198,10 +7198,11 @@ static SDValue getAddressForMemoryInput(SDValue Chain, const SDLoc &Location,
/// uses features that we can't model on machineinstrs, we have SDISel do the
/// allocation. This produces generally horrible, but correct, code.
///
/// OpInfo describes the operand.
/// OpInfo describes the operand
/// RefOpInfo describes the matching operand if any, the operand otherwise
static void GetRegistersForValue(SelectionDAG &DAG, const TargetLowering &TLI,
const SDLoc &DL,
SDISelAsmOperandInfo &OpInfo) {
const SDLoc &DL, SDISelAsmOperandInfo &OpInfo,
SDISelAsmOperandInfo &RefOpInfo) {
LLVMContext &Context = *DAG.getContext();
MachineFunction &MF = DAG.getMachineFunction();
@ -7211,8 +7212,8 @@ static void GetRegistersForValue(SelectionDAG &DAG, const TargetLowering &TLI,
// If this is a constraint for a single physreg, or a constraint for a
// register class, find it.
std::pair<unsigned, const TargetRegisterClass *> PhysReg =
TLI.getRegForInlineAsmConstraint(&TRI, OpInfo.ConstraintCode,
OpInfo.ConstraintVT);
TLI.getRegForInlineAsmConstraint(&TRI, RefOpInfo.ConstraintCode,
RefOpInfo.ConstraintVT);
unsigned NumRegs = 1;
if (OpInfo.ConstraintVT != MVT::Other) {
@ -7254,6 +7255,11 @@ static void GetRegistersForValue(SelectionDAG &DAG, const TargetLowering &TLI,
NumRegs = TLI.getNumRegisters(Context, OpInfo.ConstraintVT);
}
// No need to allocate a matching input constraint since the constraint it's
// matching to has already been allocated.
if (OpInfo.isMatchingInputConstraint())
return;
MVT RegVT;
EVT ValueVT = OpInfo.ConstraintVT;
@ -7502,19 +7508,27 @@ void SelectionDAGBuilder::visitInlineAsm(ImmutableCallSite CS) {
// If this constraint is for a specific register, allocate it before
// anything else.
if (OpInfo.ConstraintType == TargetLowering::C_Register)
GetRegistersForValue(DAG, TLI, getCurSDLoc(), OpInfo);
SDISelAsmOperandInfo &RefOpInfo =
OpInfo.isMatchingInputConstraint()
? ConstraintOperands[OpInfo.getMatchedOperand()]
: ConstraintOperands[i];
if (RefOpInfo.ConstraintType == TargetLowering::C_Register)
GetRegistersForValue(DAG, TLI, getCurSDLoc(), OpInfo, RefOpInfo);
}
// Third pass - Loop over all of the operands, assigning virtual or physregs
// to register class operands.
for (unsigned i = 0, e = ConstraintOperands.size(); i != e; ++i) {
SDISelAsmOperandInfo &OpInfo = ConstraintOperands[i];
SDISelAsmOperandInfo &RefOpInfo =
OpInfo.isMatchingInputConstraint()
? ConstraintOperands[OpInfo.getMatchedOperand()]
: ConstraintOperands[i];
// C_Register operands have already been allocated, Other/Memory don't need
// to be.
if (OpInfo.ConstraintType == TargetLowering::C_RegisterClass)
GetRegistersForValue(DAG, TLI, getCurSDLoc(), OpInfo);
if (RefOpInfo.ConstraintType == TargetLowering::C_RegisterClass)
GetRegistersForValue(DAG, TLI, getCurSDLoc(), OpInfo, RefOpInfo);
}
// AsmNodeOperands - The operands for the ISD::INLINEASM node.

80
llvm/test/CodeGen/ARM/inline-asm-operand-implicit-cast.ll
View File

@ -17,6 +17,42 @@ define arm_aapcscc double @zerobits_double_soft() #0 {
ret double %1
}
; Check support for returning a float in GPR with matching float input with
; soft float ABI
define arm_aapcscc float @flt_gpr_matching_in_op_soft(float %f) #0 {
; CHECK-LABEL: flt_gpr_matching_in_op_soft
; CHECK: mov r0, r0
%1 = call float asm "mov $0, $1", "=&r,0"(float %f)
ret float %1
}
; Check support for returning a double in GPR with matching double input with
; soft float ABI
define arm_aapcscc double @dbl_gpr_matching_in_op_soft(double %d) #0 {
; CHECK-LABEL: dbl_gpr_matching_in_op_soft
; CHECK: mov r1, r0
%1 = call double asm "mov ${0:R}, ${1:Q}", "=&r,0"(double %d)
ret double %1
}
; Check support for returning a float in specific GPR with matching float input
; with soft float ABI
define arm_aapcscc float @flt_gpr_matching_spec_reg_in_op_soft(float %f) #0 {
; CHECK-LABEL: flt_gpr_matching_spec_reg_in_op_soft
; CHECK: mov r3, r3
%1 = call float asm "mov $0, $1", "=&{r3},0"(float %f)
ret float %1
}
; Check support for returning a double in specific GPR with matching double
; input with soft float ABI
define arm_aapcscc double @dbl_gpr_matching_spec_reg_in_op_soft(double %d) #0 {
; CHECK-LABEL: dbl_gpr_matching_spec_reg_in_op_soft
; CHECK: mov r3, r2
%1 = call double asm "mov ${0:R}, ${1:Q}", "=&{r2},0"(double %d)
ret double %1
}
attributes #0 = { nounwind "target-features"="+d16,+vfp2,+vfp3,-fp-only-sp" "use-soft-float"="true" }
@ -39,4 +75,48 @@ define double @zerobits_double_hard() #1 {
ret double %1
}
; Check support for returning a float in GPR with matching float input with
; hard float ABI
define float @flt_gpr_matching_in_op_hard(float %f) #1 {
; CHECK-LABEL: flt_gpr_matching_in_op_hard
; CHECK: vmov r0, s0
; CHECK: mov r0, r0
; CHECK: vmov s0, r0
%1 = call float asm "mov $0, $1", "=&r,0"(float %f)
ret float %1
}
; Check support for returning a double in GPR with matching double input with
; hard float ABI
define double @dbl_gpr_matching_in_op_hard(double %d) #1 {
; CHECK-LABEL: dbl_gpr_matching_in_op_hard
; CHECK: vmov r0, r1, d0
; CHECK: mov r1, r0
; CHECK: vmov d0, r0, r1
%1 = call double asm "mov ${0:R}, ${1:Q}", "=&r,0"(double %d)
ret double %1
}
; Check support for returning a float in specific GPR with matching float
; input with hard float ABI
define float @flt_gpr_matching_spec_reg_in_op_hard(float %f) #1 {
; CHECK-LABEL: flt_gpr_matching_spec_reg_in_op_hard
; CHECK: vmov r3, s0
; CHECK: mov r3, r3
; CHECK: vmov s0, r3
%1 = call float asm "mov $0, $1", "=&{r3},0"(float %f)
ret float %1
}
; Check support for returning a double in specific GPR with matching double
; input with hard float ABI
define double @dbl_gpr_matching_spec_reg_in_op_hard(double %d) #1 {
; CHECK-LABEL: dbl_gpr_matching_spec_reg_in_op_hard
; CHECK: vmov r2, r3, d0
; CHECK: mov r3, r2
; CHECK: vmov d0, r2, r3
%1 = call double asm "mov ${0:R}, ${1:Q}", "=&{r2},0"(double %d)
ret double %1
}
attributes #1 = { nounwind "target-features"="+d16,+vfp2,+vfp3,-fp-only-sp" "use-soft-float"="false" }