[PowerPC] Support asm parsing for bc[l][a][+-] mnemonics
PowerPC assembly code in the wild, so it seems, has things like this:
bc+ 12, 28, .L9
This is a bit odd because the '+' here becomes part of the BO field, and the BO
field is otherwise the first operand. Nevertheless, the ISA specification does
clearly say that the +- hint syntax applies to all conditional-branch mnemonics
(that test either CTR or a condition register, although not the forms which
check both), both basic and extended, so this is supposed to be valid.
This introduces some asm-parser-only definitions which take only the upper
three bits from the specified BO value, and the lower two bits are implied by
the +- suffix (via some associated aliases).
Fixes PR23646.
llvm-svn: 280571
diff --git a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
index c7a871d..1bd4c27 100644
--- a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
+++ b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
@@ -545,6 +545,7 @@
&& isUInt<5>(getImm())); }
bool isCRBitMask() const { return Kind == Immediate && isUInt<8>(getImm()) &&
isPowerOf2_32(getImm()); }
+ bool isATBitsAsHint() const { return false; }
bool isMem() const override { return false; }
bool isReg() const override { return false; }