Match a few more obvious patterns to revsh. rdar://9147637.
llvm-svn: 127913
diff --git a/llvm/lib/Target/ARM/ARMInstrInfo.td b/llvm/lib/Target/ARM/ARMInstrInfo.td
index 0ac07bc..e90f5ca 100644
--- a/llvm/lib/Target/ARM/ARMInstrInfo.td
+++ b/llvm/lib/Target/ARM/ARMInstrInfo.td
@@ -2976,10 +2976,18 @@
IIC_iUNAr, "revsh", "\t$Rd, $Rm",
[(set GPR:$Rd,
(sext_inreg
- (or (srl (and GPR:$Rm, 0xFF00), (i32 8)),
+ (or (srl GPR:$Rm, (i32 8)),
(shl GPR:$Rm, (i32 8))), i16))]>,
Requires<[IsARM, HasV6]>;
+def : ARMV6Pat<(sext_inreg (or (srl (and GPR:$Rm, 0xFF00), (i32 8)),
+ (shl GPR:$Rm, (i32 8))), i16),
+ (REVSH GPR:$Rm)>;
+
+// Need the AddedComplexity or else MOVs + REV would be chosen.
+let AddedComplexity = 5 in
+def : ARMV6Pat<(sra (bswap GPR:$Rm), (i32 16)), (REVSH GPR:$Rm)>;
+
def lsl_shift_imm : SDNodeXForm<imm, [{
unsigned Sh = ARM_AM::getSORegOpc(ARM_AM::lsl, N->getZExtValue());
return CurDAG->getTargetConstant(Sh, MVT::i32);