diff mbox series

[PULL,15/19] target/i386: Use clmul_64

Message ID 20230915164231.123580-16-richard.henderson@linaro.org
State Accepted
Commit 7fcb505455aff817fe8984494b83e657f0f2e02b
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/i386/ops_sse.h | 40 +++++++++-------------------------------
 1 file changed, 9 insertions(+), 31 deletions(-)
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Patch

diff --git a/target/i386/ops_sse.h b/target/i386/ops_sse.h
index a0e425733f..33908c0691 100644
--- a/target/i386/ops_sse.h
+++ b/target/i386/ops_sse.h
@@ -20,6 +20,7 @@ 
 
 #include "crypto/aes.h"
 #include "crypto/aes-round.h"
+#include "crypto/clmul.h"
 
 #if SHIFT == 0
 #define Reg MMXReg
@@ -2122,41 +2123,18 @@  target_ulong helper_crc32(uint32_t crc1, target_ulong msg, uint32_t len)
 
 #endif
 
-#if SHIFT == 1
-static void clmulq(uint64_t *dest_l, uint64_t *dest_h,
-                          uint64_t a, uint64_t b)
-{
-    uint64_t al, ah, resh, resl;
-
-    ah = 0;
-    al = a;
-    resh = resl = 0;
-
-    while (b) {
-        if (b & 1) {
-            resl ^= al;
-            resh ^= ah;
-        }
-        ah = (ah << 1) | (al >> 63);
-        al <<= 1;
-        b >>= 1;
-    }
-
-    *dest_l = resl;
-    *dest_h = resh;
-}
-#endif
-
 void glue(helper_pclmulqdq, SUFFIX)(CPUX86State *env, Reg *d, Reg *v, Reg *s,
                                     uint32_t ctrl)
 {
-    uint64_t a, b;
-    int i;
+    int a_idx = (ctrl & 1) != 0;
+    int b_idx = (ctrl & 16) != 0;
 
-    for (i = 0; i < 1 << SHIFT; i += 2) {
-        a = v->Q(((ctrl & 1) != 0) + i);
-        b = s->Q(((ctrl & 16) != 0) + i);
-        clmulq(&d->Q(i), &d->Q(i + 1), a, b);
+    for (int i = 0; i < SHIFT; i++) {
+        uint64_t a = v->Q(2 * i + a_idx);
+        uint64_t b = s->Q(2 * i + b_idx);
+        Int128 *r = (Int128 *)&d->ZMM_X(i);
+
+        *r = clmul_64(a, b);
     }
 }