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We have decided not to support inline asm where an output operand with a matching input operand with incompatible type (i.e. either one is a floating point and the other is an integer or the sizes of the types differ). SelectionDAGBuild will catch these and exit with an error.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61092 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-12-16 18:21:39 +00:00
parent 8069f28a5d
commit 09dc9c0c83
2 changed files with 13 additions and 11 deletions
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23
lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
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@ -5048,20 +5048,21 @@ void SelectionDAGLowering::visitInlineAsm(CallSite CS) {
SDISelAsmOperandInfo &OpInfo = ConstraintOperands[i];
// If this is an output operand with a matching input operand, look up the
// matching input. It might have a different type (e.g. the output might be
// i32 and the input i64) and we need to pick the larger width to ensure we
// reserve the right number of registers.
// matching input. If their types mismatch, e.g. one is an integer, the
// other is floating point, or their sizes are different, flag it as an
// error.
if (OpInfo.hasMatchingInput()) {
SDISelAsmOperandInfo &Input = ConstraintOperands[OpInfo.MatchingInput];
if (OpInfo.ConstraintVT != Input.ConstraintVT) {
assert(OpInfo.ConstraintVT.isInteger() &&
Input.ConstraintVT.isInteger() &&
"Asm constraints must be the same or different sized integers");
if (OpInfo.ConstraintVT.getSizeInBits() <
Input.ConstraintVT.getSizeInBits())
OpInfo.ConstraintVT = Input.ConstraintVT;
else
Input.ConstraintVT = OpInfo.ConstraintVT;
if ((OpInfo.ConstraintVT.isInteger() !=
Input.ConstraintVT.isInteger()) ||
(OpInfo.ConstraintVT.getSizeInBits() !=
Input.ConstraintVT.getSizeInBits())) {
cerr << "Unsupported asm: input constraint with a matching output "
<< "constraint of incompatible type!\n";
exit(1);
}
Input.ConstraintVT = OpInfo.ConstraintVT;
}
}

1
test/CodeGen/PowerPC/2008-10-17-AsmMatchingOperands.ll
View File

@ -1,4 +1,5 @@
; RUN: llvm-as < %s | llc
; XFAIL: *
; PR2356
target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f128:64:128"
target triple = "powerpc-apple-darwin9"