diff options
| -rw-r--r-- | lib/Target/ARM/ARMInstrInfo.td | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td index 7e00b4bedd..761434b4f8 100644 --- a/lib/Target/ARM/ARMInstrInfo.td +++ b/lib/Target/ARM/ARMInstrInfo.td @@ -1567,8 +1567,12 @@ defm UXTH : AI_unary_rrot<0b01101111, defm UXTB16 : AI_unary_rrot<0b01101100, "uxtb16", UnOpFrag<(and node:$Src, 0x00FF00FF)>>; -def : ARMV6Pat<(and (shl GPR:$Src, (i32 8)), 0xFF00FF), - (UXTB16r_rot GPR:$Src, 24)>; +// FIXME: This pattern incorrectly assumes the shl operator is a rotate. +// The transformation should probably be done as a combiner action +// instead so we can include a check for masking back in the upper +// eight bits of the source into the lower eight bits of the result. +//def : ARMV6Pat<(and (shl GPR:$Src, (i32 8)), 0xFF00FF), +// (UXTB16r_rot GPR:$Src, 24)>; def : ARMV6Pat<(and (srl GPR:$Src, (i32 8)), 0xFF00FF), (UXTB16r_rot GPR:$Src, 8)>; |