diff options
Diffstat (limited to 'opcodes/ppc-opc.c')
| -rw-r--r-- | opcodes/ppc-opc.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/opcodes/ppc-opc.c b/opcodes/ppc-opc.c index 35f7fc6..51fcfe2 100644 --- a/opcodes/ppc-opc.c +++ b/opcodes/ppc-opc.c @@ -1004,8 +1004,13 @@ insert_fxm (unsigned long insn, /* If only one bit of the FXM field is set, we can use the new form of the instruction, which is faster. Unlike the Power4 branch hint - encoding, this is not backward compatible. */ - else if ((dialect & PPC_OPCODE_POWER4) != 0 && (value & -value) == value) + encoding, this is not backward compatible. Do not generate the + new form unless -mpower4 has been given, or -many and the two + operand form of mfcr was used. */ + else if ((value & -value) == value + && ((dialect & PPC_OPCODE_POWER4) != 0 + || ((dialect & PPC_OPCODE_ANY) != 0 + && (insn & (0x3ff << 1)) == 19 << 1))) insn |= 1 << 20; /* Any other value on mfcr is an error. */ |