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| author | Gabe Black <gblack@eecs.umich.edu> | 2010-06-02 12:58:12 -0500 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2010-06-02 12:58:12 -0500 |
| commit | 7eb4d02dd9a008db32449f42037d670eab41f2c4 (patch) | |
| tree | b1177b2f8bc786bc2cca87dbaa7a0c42f50ca8cf | |
| parent | abda50173cee3c8a9fc080e07040c042b57cb4aa (diff) | |
| download | gem5-7eb4d02dd9a008db32449f42037d670eab41f2c4.tar.xz | |
ARM: Add a function to decode SIMD modified immediate constants.
| -rw-r--r-- | src/arch/arm/insts/pred_inst.hh | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/arch/arm/insts/pred_inst.hh b/src/arch/arm/insts/pred_inst.hh index 8f92a2f26..76d1029e8 100644 --- a/src/arch/arm/insts/pred_inst.hh +++ b/src/arch/arm/insts/pred_inst.hh @@ -77,6 +77,73 @@ modified_imm(uint8_t ctrlImm, uint8_t dataImm) return bigData << (32 - bigCtrl); } +static inline uint64_t +simd_modified_imm(bool op, uint8_t cmode, uint8_t data) +{ + uint64_t bigData = data; + switch (cmode) { + case 0x0: + case 0x1: + bigData = (bigData << 0) | (bigData << 32); + break; + case 0x2: + case 0x3: + bigData = (bigData << 8) | (bigData << 40); + break; + case 0x4: + case 0x5: + bigData = (bigData << 16) | (bigData << 48); + break; + case 0x6: + case 0x7: + bigData = (bigData << 24) | (bigData << 56); + break; + case 0x8: + case 0x9: + bigData = (bigData << 0) | (bigData << 16) | + (bigData << 32) | (bigData << 48); + break; + case 0xa: + case 0xb: + bigData = (bigData << 8) | (bigData << 24) | + (bigData << 40) | (bigData << 56); + break; + case 0xc: + bigData = (0xffULL << 0) | (bigData << 8) | + (0xffULL << 32) | (bigData << 40); + break; + case 0xd: + bigData = (0xffffULL << 0) | (bigData << 16) | + (0xffffULL << 32) | (bigData << 48); + break; + case 0xe: + if (op) { + bigData = (bigData << 0) | (bigData << 8) | + (bigData << 16) | (bigData << 24) | + (bigData << 32) | (bigData << 40) | + (bigData << 48) | (bigData << 56); + } else { + bigData = 0; + for (int i = 7; i >= 0; i--) { + if (bits(data, i)) { + bigData |= (0xFF << (i * 8)); + } + } + } + case 0xf: + if (!op) { + uint64_t bVal = bits(bigData, 6) ? (0x1F) : (0x20); + bigData = (bits(bigData, 5, 0) << 19) | + (bVal << 25) | (bits(bigData, 7) << 31); + bigData |= (bigData << 32); + } + // Fall through + default: + panic("Illegal modified SIMD immediate parameters.\n"); + } + return bigData; +} + /** * Base class for predicated integer operations. |