@@ void simple_idct_ARM(int16_t *block)
@@ save stack for reg needed (take all of them),
@@ R0-R3 are scratch regs, so no need to save them, but R0 contains the pointer to block
@@ void simple_idct_ARM(int16_t *block)
@@ save stack for reg needed (take all of them),
@@ R0-R3 are scratch regs, so no need to save them, but R0 contains the pointer to block