P3.1: extract FFT code from rt snap (extract_fft.py); decode cplx_mul 0x8440 = in-place elementwise double mult, twiddle loader 0x39b00 stride copy, dispatcher 0x535a70->0x140a10/70->jumptable[0x1826159a0]=4; implement cplx_mul_scalar_inplace

2026-08-20 02:25:59 +03:00
parent 22e4599e0a
commit 88422034f5
4 changed files with 101 additions and 0 deletions
@@ -3,6 +3,13 @@

 namespace fft_stage {

+// 0x180008440: dst[i] *= src[i]  (double, in-place elementwise; kernel 0x18003fa20)
+void cplx_mul_scalar_inplace(double* dst, const double* src, uint32_t n) {
+    for (uint32_t i = 0; i < n; i++) {
+        dst[i] *= src[i];
+    }
+}
+
 // cplx_mul — complex elementwise multiply: out = in1 * in2 (conjugated 2nd)
 void cplx_mul(double* out, const double* in1, const double* in2, uint32_t n) {
    for (uint32_t i = 0; i < n * 2; i += 2) {