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Small optimization on AVR32

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* syscall.c (syscall_enter): Optimize tcp->u_arg[i] setting
from regs.FOO for AVR32.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko 2011-08-30 19:04:54 +02:00
parent eb0e3e8f50
commit b5b2589231
1 changed files with 8 additions and 9 deletions
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17
syscall.c
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@ -1503,15 +1503,14 @@ syscall_enter(struct tcb *tcp)
for (i = 0; i < nargs; ++i)
tcp->u_arg[i] = regs.uregs[i];
# elif defined(AVR32)
/* TODO: make it faster by unrolling into 6 direct assignments */
static const unsigned long *argregp[MAX_ARGS] = { &regs.r12,
&regs.r11,
&regs.r10,
&regs.r9,
&regs.r5,
&regs.r3 };
for (i = 0; i < nargs; ++i)
tcp->u_arg[i] = *argregp[i];
(void)i;
(void)nargs;
tcp->u_arg[0] = regs.r12;
tcp->u_arg[1] = regs.r11;
tcp->u_arg[2] = regs.r10;
tcp->u_arg[3] = regs.r9;
tcp->u_arg[4] = regs.r5;
tcp->u_arg[5] = regs.r3;
# elif defined(BFIN)
static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 };