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xtensa: ISS: improve simcall assembly 

Drop redundant result moving from inline assembly, use a1 and b1 values
as return value and errno value respectively.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2020-02-04 12:51:21 -08:00
parent 5e4417f921
commit c74c0fd228
1 changed files with 3 additions and 5 deletions
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8
arch/xtensa/platforms/iss/include/platform/simcall.h
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@ -66,19 +66,17 @@ static int errno;
static inline int __simc(int a, int b, int c, int d)
{
int ret;
register int a1 asm("a2") = a;
register int b1 asm("a3") = b;
register int c1 asm("a4") = c;
register int d1 asm("a5") = d;
__asm__ __volatile__ (
"simcall\n"
"mov %0, a2\n"
"mov %1, a3\n"
: "=a" (ret), "=a" (errno), "+r"(a1), "+r"(b1)
: "+r"(a1), "+r"(b1)
: "r"(c1), "r"(d1)
: "memory");
return ret;
errno = b1;
return a1;
}
static inline int simc_exit(int exit_code)