diff mbox series

[PULL,14/19] target/arm: Use clmul_64

Message ID 20230915164231.123580-15-richard.henderson@linaro.org
State Accepted
Commit a50cfdf0be23e4d3ef52d1beb5e206b7be2a80f2
Headers show
Series [PULL,01/19] crypto: Add generic 8-bit carry-less multiply routines | expand

Commit Message

Richard Henderson Sept. 15, 2023, 4:42 p.m. UTC 
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>
---
 target/arm/tcg/vec_helper.c | 22 ++++------------------
 1 file changed, 4 insertions(+), 18 deletions(-)
diff mbox series

Patch

diff --git a/target/arm/tcg/vec_helper.c b/target/arm/tcg/vec_helper.c
index ffb4b44ce4..1f93510b85 100644
--- a/target/arm/tcg/vec_helper.c
+++ b/target/arm/tcg/vec_helper.c
@@ -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)
 {
-    intptr_t i, j, opr_sz = simd_oprsz(desc);
+    intptr_t i, opr_sz = simd_oprsz(desc);
     intptr_t hi = simd_data(desc);
     uint64_t *d = vd, *n = vn, *m = vm;
 
     for (i = 0; i < opr_sz / 8; i += 2) {
-        uint64_t nn = n[i + hi];
-        uint64_t mm = m[i + hi];
-        uint64_t rhi = 0;
-        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;
+        Int128 r = clmul_64(n[i + hi], m[i + hi]);
+        d[i] = int128_getlo(r);
+        d[i + 1] = int128_gethi(r);
     }
     clear_tail(d, opr_sz, simd_maxsz(desc));
 }