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authorAnthony Blake <anthonix@me.com>2012-08-31 12:34:41 +1200
committerAnthony Blake <anthonix@me.com>2012-08-31 12:34:41 +1200
commitdd82bd76cfe90076b19bf403e0443807166dd476 (patch)
tree2c1d761edbc0719cfbc897442763c1e813312097 /src/codegen.c
parent73a05e6b7ebe7d25e7e8b861ed29df2161b34c82 (diff)
downloadffts-dd82bd76cfe90076b19bf403e0443807166dd476.zip
ffts-dd82bd76cfe90076b19bf403e0443807166dd476.tar.gz
Using shifts for N in body
Diffstat (limited to 'src/codegen.c')
-rw-r--r--src/codegen.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/src/codegen.c b/src/codegen.c
index b595cb5..1a12f99 100644
--- a/src/codegen.c
+++ b/src/codegen.c
@@ -280,7 +280,24 @@ void ffts_generate_func_code(ffts_plan_t *p, size_t N, size_t leafN) {
MOVI(&fp, RCX, pps[0] / 4);
}else{
if((pps[1]*4)-pAddr) ADDI(&fp, RDX, (pps[1] * 4)- pAddr);
- if(pps[0] - pN) ADDI(&fp, RCX, (pps[0] - pN) / 4);
+ if(pps[0] > leafN && pps[0] - pN) {
+
+ int diff = __builtin_ctzl(pps[0]) - __builtin_ctzl(pN);
+ *fp++ = 0xc1;
+
+ if(diff > 0) {
+ *fp++ = 0xe1;
+ *fp++ = (diff & 0xff);
+ }else{
+ *fp++ = 0xe9;
+ *fp++ = ((-diff) & 0xff);
+ }
+
+
+ fprintf(stderr, "%d -> %d = shl %d\n", pps[0], pN, diff);
+ // ADDI(&fp, RCX, (pps[0] - pN) / 4);
+
+ }
}
if(p->ws_is[__builtin_ctzl(pps[0]/leafN)-1]*8 - pLUT)
@@ -299,7 +316,8 @@ void ffts_generate_func_code(ffts_plan_t *p, size_t N, size_t leafN) {
}
pAddr = pps[1] * 4;
- pN = pps[0];
+ if(pps[0] > leafN)
+ pN = pps[0];
pLUT = p->ws_is[__builtin_ctzl(pps[0]/leafN)-1]*8;//LUT_offset(pps[0], leafN);
// fprintf(stderr, "LUT offset for %d is %d\n", pN, pLUT);
count += 4;
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