[llvm-dev] InstAlias with tied operands - can it be supported?
via llvm-dev
llvm-dev at lists.llvm.org
Thu Dec 14 18:12:48 PST 2017
Hello,
InstAlias does not allow tied operands (repeated operands) in the asm
string to be matched.
It seems this situation is explicitly prevented in
AsmMatcherEmitter.cpp:
if (!Hack)
PrintFatalError(TheDef->getLoc(),
"ERROR: matchable with tied operand '" + Tok +
"' can never be matched!");
// FIXME: Should reject these. The ARM backend hits this with
$lane in a
// bunch of instructions. It is unclear what the right answer is.
…
Is there a way to fix this limitation?
I would like to express: InstAlias<(opcode $rd, $rd, $rs1), (newopcode
$rd, $rs1)>
Thank you,
Ana.
--
Ana Pazos
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project.
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