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Subject[PATCH -mm] i386 syscall opcode reordering (pipelining)
Hi all,

I'd guess that this version features improved pipeline parallelism,
since we isolate competing %ebx accesses (_syscall4()) and
stack push operations (_syscall5()), right?

Signed-off-by: Andreas Mohr <andi@lisas.de>


diff -urN linux-2.6.17-rc6-mm2.orig/include/asm-i386/unistd.h linux-2.6.17-rc6-mm2.my/include/asm-i386/unistd.h
--- linux-2.6.17-rc6-mm2.orig/include/asm-i386/unistd.h 2006-06-13 19:28:15.000000000 +0200
+++ linux-2.6.17-rc6-mm2.my/include/asm-i386/unistd.h 2006-06-13 19:40:07.000000000 +0200
@@ -400,7 +400,7 @@
type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5) \
{ \
long __res; \
-__asm__ volatile ("push %%ebx ; movl %2,%%ebx ; movl %1,%%eax ; " \
+__asm__ volatile ("push %%ebx ; movl %1,%%eax ; movl %2,%%ebx ; " \
"int $0x80 ; pop %%ebx" \
: "=a" (__res) \
: "i" (__NR_##name),"ri" ((long)(arg1)),"c" ((long)(arg2)), \
@@ -415,8 +415,8 @@
{ \
long __res; \
struct { long __a1; long __a6; } __s = { (long)arg1, (long)arg6 }; \
-__asm__ volatile ("push %%ebp ; push %%ebx ; movl 4(%2),%%ebp ; " \
- "movl 0(%2),%%ebx ; movl %1,%%eax ; int $0x80 ; " \
+__asm__ volatile ("push %%ebp ; movl %1,%%eax ; push %%ebx ; " \
+ "movl 4(%2),%%ebp ; movl 0(%2),%%ebx ; int $0x80 ; " \
"pop %%ebx ; pop %%ebp" \
: "=a" (__res) \
: "i" (__NR_##name),"0" ((long)(&__s)),"c" ((long)(arg2)), \
-
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