diff options
| -rw-r--r-- | lib/Target/ARM/ARMISelLowering.cpp | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 7f80e87..ade251d 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -1332,6 +1332,15 @@ bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM, // r + r if (((unsigned)AM.HasBaseReg + AM.Scale) <= 2) return true; + + case MVT::isVoid: + // Note, we allow "void" uses (basically, uses that aren't loads or + // stores), because arm allows folding a scale into many arithmetic + // operations. This should be made more precise and revisited later. + + // Allow r << imm, but the imm has to be a multiple of two. + if (AM.Scale & 1) return false; + return isPowerOf2_32(AM.Scale); } break; } @@ -1413,12 +1422,19 @@ bool ARMTargetLowering::isLegalAddressScale(int64_t S, const Type *Ty) const { case MVT::i1: case MVT::i8: case MVT::i32: - // r + r - if (S == 2) - return true; - // r + r << imm + // Allow: r + r + // Allow: r << imm + // Allow: r + r << imm S &= ~1; return isPowerOf2_32(S); + case MVT::isVoid: + // Note, we allow "void" uses (basically, uses that aren't loads or + // stores), because arm allows folding a scale into many arithmetic + // operations. This should be made more precise and revisited later. + + // Allow r << imm, but the imm has to be a multiple of two. + if (S & 1) return false; + return isPowerOf2_32(S); } } |