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target/arm: Use clmul_64

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Use generic routine for 64-bit carry-less multiply.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-11 10:13:45 +01:00
parent 00f463b38a
commit a50cfdf0be
1 changed files with 4 additions and 18 deletions
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22
target/arm/tcg/vec_helper.c
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@ -2003,28 +2003,14 @@ void HELPER(gvec_pmul_b)(void *vd, void *vn, void *vm, uint32_t desc)
*/ */
void HELPER(gvec_pmull_q)(void *vd, void *vn, void *vm, uint32_t desc) void HELPER(gvec_pmull_q)(void *vd, void *vn, void *vm, uint32_t desc)
{ {
intptr_t i, j, opr_sz = simd_oprsz(desc); intptr_t i, opr_sz = simd_oprsz(desc);
intptr_t hi = simd_data(desc); intptr_t hi = simd_data(desc);
uint64_t *d = vd, *n = vn, *m = vm; uint64_t *d = vd, *n = vn, *m = vm;
for (i = 0; i < opr_sz / 8; i += 2) { for (i = 0; i < opr_sz / 8; i += 2) {
uint64_t nn = n[i + hi]; Int128 r = clmul_64(n[i + hi], m[i + hi]);
uint64_t mm = m[i + hi]; d[i] = int128_getlo(r);
uint64_t rhi = 0; d[i + 1] = int128_gethi(r);
uint64_t rlo = 0;
/* Bit 0 can only influence the low 64-bit result. */
if (nn & 1) {
rlo = mm;
}
for (j = 1; j < 64; ++j) {
uint64_t mask = -((nn >> j) & 1);
rlo ^= (mm << j) & mask;
rhi ^= (mm >> (64 - j)) & mask;
}
d[i] = rlo;
d[i + 1] = rhi;
} }
clear_tail(d, opr_sz, simd_maxsz(desc)); clear_tail(d, opr_sz, simd_maxsz(desc));
} }