X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=fceu.git;a=blobdiff_plain;f=drivers%2Fgp2x%2Fasmutils.s;h=3db4e303e352270eec9b3a052ea44fd8ec3d6d97;hp=a7f123f745c90a0ac2829bf71ef690e8a5adcba9;hb=b2b95d2e0d1fd5e52d03c2152605b09b024c1d0e;hpb=e1591a12a775a600572ffccb2d6f8f4d6343b7dd

diff --git a/drivers/gp2x/asmutils.s b/drivers/gp2x/asmutils.s
index a7f123f..3db4e30 100644
--- a/drivers/gp2x/asmutils.s
+++ b/drivers/gp2x/asmutils.s
@@ -54,6 +54,18 @@ block_loop_andor:
     bx      lr
 
 
+.global spend_cycles @ c
+
+spend_cycles:
+    mov     r0, r0, lsr #2  @ 4 cycles/iteration
+    sub     r0, r0, #2      @ entry/exit/init
+.sc_loop:
+    subs    r0, r0, #1
+    bpl     .sc_loop
+
+    bx      lr
+
+
 
 /* buggy and slow, probably because function call overhead
 @ renderer helper, based on bitbank's method