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trivial jump size optimization

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This commit is contained in:
bellard 2002-09-08 22:06:11 +00:00
parent 1cb355747a
commit 3748975feb
1 changed files with 9 additions and 2 deletions
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9
i386-gen.c
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@ -233,7 +233,7 @@ void load(int r, SValue *sv)
} else if (v == VT_JMP || v == VT_JMPI) { } else if (v == VT_JMP || v == VT_JMPI) {
t = v & 1; t = v & 1;
oad(0xb8 + r, t); /* mov $1, r */ oad(0xb8 + r, t); /* mov $1, r */
oad(0xe9, 5); /* jmp after */ o(0x05eb); /* jmp after */
gsym(fc); gsym(fc);
oad(0xb8 + r, t ^ 1); /* mov $0, r */ oad(0xb8 + r, t ^ 1); /* mov $0, r */
} else if (v != r) { } else if (v != r) {
@ -479,8 +479,15 @@ int gjmp(int t)
/* generate a jump to a fixed address */ /* generate a jump to a fixed address */
void gjmp_addr(int a) void gjmp_addr(int a)
{ {
int r;
r = a - ind - 2;
if (r == (char)r) {
g(0xeb);
g(r);
} else {
oad(0xe9, a - ind - 5); oad(0xe9, a - ind - 5);
} }
}
/* generate a test. set 'inv' to invert test. Stack entry is popped */ /* generate a test. set 'inv' to invert test. Stack entry is popped */
int gtst(int inv, int t) int gtst(int inv, int t)