diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp index 59fae27..502a48b 100644 --- a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp +++ b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp @@ -146,11 +146,13 @@ bool ARMAsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, const MCInstFragment *DF, const MCAsmLayout &Layout) const { - // FIXME: This isn't correct for ARM. Just moving the "generic" logic - // into the targets for now. + // Relaxing tBcc to t2Bcc. tBcc has a signed 9-bit displacement with the + // low bit being an implied zero. There's an implied +4 offset for the + // branch, so we adjust the other way here to determine what's + // encodable. // // Relax if the value is too big for a (signed) i8. - return int64_t(Value) != int64_t(int8_t(Value)); + return int64_t((Value - 4)>>1) != int64_t(int8_t((Value - 4)>>1)); } void ARMAsmBackend::RelaxInstruction(const MCInst &Inst, MCInst &Res) const { |