>From kettenis@'s corresponding commit on amd64:
Remove branch prediction hints from conditional branch instructions.
These hints are not recognized by clang's builtin assembler and
the opcode prefixes they generate have been no-ops for all CPUs
after the Pentium 4.
Admittedly, CPUs <= Pentium 4 are the target for i386, but I think
we can afford the loss of this micro-optimization.
ok?
Index: arch/i386/SYS.h
===================================================================
RCS file: /cvs/src/lib/libc/arch/i386/SYS.h,v
retrieving revision 1.25
diff -u -p -r1.25 SYS.h
--- arch/i386/SYS.h 7 May 2016 19:05:21 -0000 1.25
+++ arch/i386/SYS.h 31 May 2017 22:52:21 -0000
@@ -89,7 +89,7 @@
movl $-1, %eax; \
movl $-1, %edx /* for lseek */
#define HANDLE_ERRNO() \
- jnc,pt 99f; \
+ jnc 99f; \
SET_ERRNO(); \
99:
--
Christian "naddy" Weisgerber na...@mips.inka.de
