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ARM: Add a function to decode VFP modified immediate constants.

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This commit is contained in:
Gabe Black 2010-06-02 12:58:12 -05:00
parent 7eb4d02dd9
commit b87ebf382f
1 changed files with 19 additions and 0 deletions
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19
src/arch/arm/insts/pred_inst.hh
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@ -144,6 +144,25 @@ simd_modified_imm(bool op, uint8_t cmode, uint8_t data)
return bigData; return bigData;
} }
static inline uint64_t
vfp_modified_imm(uint8_t data, bool wide)
{
uint64_t bigData = data;
uint64_t repData;
if (wide) {
repData = bits(data, 6) ? 0xFF : 0;
bigData = (bits(bigData, 5, 0) << 48) |
(repData << 54) | (bits(~bigData, 6) << 62) |
(bits(bigData, 7) << 63);
} else {
repData = bits(data, 6) ? 0x1F : 0;
bigData = (bits(bigData, 5, 0) << 19) |
(repData << 25) | (bits(~bigData, 6) << 30) |
(bits(bigData, 7) << 31);
}
return bigData;
}
/** /**
* Base class for predicated integer operations. * Base class for predicated integer operations.