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Crazy working permute by Rick.

This commit is contained in:
Ben Vanik 2014-01-13 22:36:51 -08:00
parent dcc0e55a90
commit 857ce4a2e2
1 changed files with 22 additions and 7 deletions
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29
src/alloy/backend/ivm/ivm_intcode.cc
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@ -3681,16 +3681,31 @@ uint32_t IntCode_PERMUTE_V128_BY_INT32(IntCodeState& ics, const IntCode* i) {
}
return IA_NEXT;
}
static const uint8_t __swap_table[16] = {
3, 2, 1, 0,
7, 6, 5, 4,
11, 10, 9, 8,
15, 14, 13, 12,
};
uint8_t grab(const vec128_t& src, uint8_t index) {
return (index < 8
? (src.low >> (__swap_table[index] << 3))
: (src.high >> ((__swap_table[index - 8]) << 3))) & 0xFF;
}
uint32_t IntCode_PERMUTE_V128_BY_V128(IntCodeState& ics, const IntCode* i) {
const vec128_t& src1 = ics.rf[i->src1_reg].v128;
const vec128_t& table = ics.rf[i->src1_reg].v128;
const vec128_t& src2 = ics.rf[i->src2_reg].v128;
const vec128_t& src3 = ics.rf[i->src3_reg].v128;
vec128_t& dest = ics.rf[i->dest_reg].v128;
for (size_t i = 0; i < 16; i++) {
size_t b = src1.b16[i] & 0x1F;
dest.b16[i] = b < 16 ?
src2.b16[b] :
src3.b16[b - 16];
vec128_t& dests = ics.rf[i->dest_reg].v128;
dests.low = dests.high = 0;
for (size_t n = 0; n < 16; n++) {
uint8_t index = table.b16[n] & 0x1F;
uint8_t value = index < 16
? grab(src2, index)
: grab(src3, index - 16);
uint64_t& dest = n < 8 ? dests.low : dests.high;
uint8_t shift = __swap_table[(n < 8 ? n : (n - 8))] << 3;
dest |= (((uint64_t)value) << shift);
}
return IA_NEXT;
}