memcpy: removed redundant instructions using cbz

NaohiroTamura · Apr 20, 2021 · 94363b4 · 94363b4
1 parent d57bed7
commit 94363b4
Showing 1 changed file with 3 additions and 6 deletions.
diff --git a/sysdeps/aarch64/multiarch/memcpy_a64fx.S b/sysdeps/aarch64/multiarch/memcpy_a64fx.S
@@ -325,8 +325,7 @@ L(L2):
     sub         tmp1, vector_length, 1
     and         tmp2, dest_ptr, tmp1
     // if vl_remainder == 0
-    cmp         tmp2, 0
-    b.eq        1f
+    cbz         tmp2, 1f
     sub         vl_remainder, vector_length, tmp2
     // process remainder until the first vector_length boundary
     whilelt     p2.b, xzr, vl_remainder
@@ -339,8 +338,7 @@ L(L2):
 1:  mov         tmp1, CACHE_LINE_SIZE
     and         tmp2, dest_ptr, CACHE_LINE_SIZE - 1
     // if cl_remainder == 0
-    cmp         tmp2, 0
-    b.eq        L(L2_dc_zva)
+    cbz         tmp2, L(L2_dc_zva)
     sub         cl_remainder, tmp1, tmp2
     // process remainder until the first CACHE_LINE_SIZE boundary
     mov         tmp1, xzr       // index
@@ -459,8 +457,7 @@ L(unroll1):
 
     .p2align 3
 L(last):
-    cmp         rest, 0
-    b.eq        1f
+    cbz         rest, 1f
     whilelt     p2.b, xzr, rest
     ld1b        z0.b, p2/z, [src_ptr]
     st1b        z0.b, p2, [dest_ptr]