Remove new aligned memcpy path for cortex-a15.
For some reason the new cortex-a15 memcpy code from ARM is really bad
for really large copies. This change forces us to go down the old path
for all copies.
All of my benchmarks show the new version is faster for large copies, but
something is going on that I don't understand.
Bug: 10838353
Change-Id: I01c16d4a2575e76f4c69862c6f78fd9024eb3fb8
diff --git a/libc/arch-arm/cortex-a15/bionic/memcpy_base.S b/libc/arch-arm/cortex-a15/bionic/memcpy_base.S
index 0154676..de9e33b 100644
--- a/libc/arch-arm/cortex-a15/bionic/memcpy_base.S
+++ b/libc/arch-arm/cortex-a15/bionic/memcpy_base.S
@@ -74,8 +74,10 @@
cmp r2, #16
blo .L_copy_less_than_16_unknown_align
- cmp r2, #832
- bge .L_check_alignment
+ // TODO: The aligned copy code is extremely slow copying some large
+ // buffers so always go through the unaligned path for now.
+ //cmp r2, #832
+ //bge .L_check_alignment
.L_copy_unknown_alignment:
// Unknown alignment of src and dst.