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Add comment and fix range check in condition.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148455 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2012-01-19 01:50:30 +00:00
parent 904b7be27e
commit d26bad079d
1 changed files with 3 additions and 1 deletions
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4
lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
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@ -180,8 +180,10 @@ bool ARMAsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup,
return Offset > 254 || Offset < -256;
}
case ARM::fixup_arm_thumb_cp: {
// If the immediate is negative, greater than 1020, or not a multiple
// of four, the wide version of the instruction must be used.
int64_t Offset = int64_t(Value) - 4;
return Offset > 4095 || Offset < 0;
return Offset > 1020 || Offset < 0 || Offset & 3;
}
}
llvm_unreachable("Invalid switch/cash!?");