libbb/sha1: simplify cpuid code

function                                             old     new   delta
sha1_begin                                           107     106      -1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 10 insertions, 32 deletions

diff --git a/libbb/hash_md5_sha.c b/libbb/hash_md5_sha.c
index 0b3af723a..a23db5152 100644
--- a/libbb/hash_md5_sha.c
+++ b/libbb/hash_md5_sha.c
@@ -1143,43 +1143,21 @@ static void FAST_FUNC sha512_process_block128(sha512_ctx_t *ctx)
 #endif /* NEED_SHA512 */
 
 #if ENABLE_SHA1_HWACCEL
-# if defined(__GNUC__) && defined(__i386__)
+# if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
 static void cpuid(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
 {
-        asm (
-                "       cpuid\n"
-                : "=a"(*eax), /* Output */
-                  "=b"(*ebx),
-                  "=c"(*ecx),
-                  "=d"(*edx)
-                : "0"(*eax),  /* Input */
-                  "1"(*ebx),
-                  "2"(*ecx),
-                  "3"(*edx)
-                /* No clobbered registers */
+        asm ("cpuid"
+                : "=a"(*eax), "=b"(*ebx), "=c"(*ecx), "=d"(*edx)
+                : "0"(*eax),  "1"(*ebx),  "2"(*ecx),  "3"(*edx)
         );
 }
-struct ASM_expects_76_shaNI { char t[1 - 2*(offsetof(sha1_ctx_t, hash) != 76)]; };
 void FAST_FUNC sha1_process_block64_shaNI(sha1_ctx_t *ctx);
-# endif
-# if defined(__GNUC__) && defined(__x86_64__)
-static void cpuid(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
-{
-        asm (
-                "cpuid\n"
-                : "=a"(*eax), /* Output */
-                  "=b"(*ebx),
-                  "=c"(*ecx),
-                  "=d"(*edx)
-                : "0"(*eax),  /* Input */
-                  "1"(*ebx),
-                  "2"(*ecx),
-                  "3"(*edx)
-                /* No clobbered registers */
-        );
-}
+#  if defined(__i386__)
+struct ASM_expects_76_shaNI { char t[1 - 2*(offsetof(sha1_ctx_t, hash) != 76)]; };
+#  endif
+#  if defined(__x86_64__)
 struct ASM_expects_80_shaNI { char t[1 - 2*(offsetof(sha1_ctx_t, hash) != 80)]; };
-void FAST_FUNC sha1_process_block64_shaNI(sha1_ctx_t *ctx);
+#  endif
 # endif
 #endif
 
@@ -1199,7 +1177,7 @@ void FAST_FUNC sha1_begin(sha1_ctx_t *ctx)
                 if (!shaNI) {
                         unsigned eax = 7, ebx = ebx, ecx = 0, edx = edx;
                         cpuid(&eax, &ebx, &ecx, &edx);
-                        shaNI = ((ebx >> 28) & 2) - 1;
+                        shaNI = ((ebx >> 29) << 1) - 1;
                 }
                 if (shaNI > 0)
                         ctx->process_block = sha1_process_block64_shaNI;