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Merge pull request #1217 from ipatix/fix_O3

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rewrite MultiBootWaitCycles as naked function
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PikalaxALT 2020-10-03 12:34:02 -04:00 committed by GitHub
commit 4a773ce18d
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1 changed files with 17 additions and 16 deletions
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33
src/multiboot.c
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@ -1,3 +1,4 @@
#include "global.h"
#include "gba/gba.h"
#include "multiboot.h"
@ -435,23 +436,23 @@ static int MultiBootHandShake(struct MultiBootParam *mp)
#undef must_data
}
static NOINLINE void MultiBootWaitCycles(u32 cycles)
NAKED
static void MultiBootWaitCycles(u32 cycles)
{
asm("mov r2, pc");
asm("lsr r2, #24");
asm("mov r1, #12");
asm("cmp r2, #0x02");
asm("beq MultiBootWaitCyclesLoop");
asm("mov r1, #13");
asm("cmp r2, #0x08");
asm("beq MultiBootWaitCyclesLoop");
asm("mov r1, #4");
asm("MultiBootWaitCyclesLoop:");
asm("sub r0, r1");
asm("bgt MultiBootWaitCyclesLoop");
asm_unified("\
mov r2, pc\n\
lsrs r2, 24\n\
movs r1, 12\n\
cmp r2, 2\n\
beq MultiBootWaitCyclesLoop\n\
movs r1, 13\n\
cmp r2, 8\n\
beq MultiBootWaitCyclesLoop\n\
movs r1, 4\n\
MultiBootWaitCyclesLoop:\n\
subs r0, r1\n\
bgt MultiBootWaitCyclesLoop\n\
bx lr\n");
}
static void MultiBootWaitSendDone(void)