WIP: use perf probes to trace assembly calls

profile_asm.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# list all the assembly routines we can put probes on related to itx.rs, etc.
+# perf probe -x target/release/dav1d --funcs=dav1d_inv_txfm_add_* > rav1d_inv_txfm_add.list.txt
+
+# count number of assembly routines
+# perf probe -x target/release/dav1d --funcs=dav1d_inv_txfm_add_* | wc -l
+
+# build dav1d release mode without trimming unused assembly routines
+# meson build --buildtype release -Dtrim_dsp=false
+# ninja -C build
+
+# perf probe -x build/src/libdav1d.so.6.8.0 --funcs=dav1d_inv_txfm_add_* > dav1d_inv_txfm_add.list.txt
+# perf probe -x build/src/libdav1d.so.6.8.0 --funcs=dav1d_inv_txfm_add_* | wc -l
+
+# FINDING: confirmed that rav1d/main has the same itx asm routines as the dav1d binary
+
+perf probe -x target/release/dav1d dav1d_inv_txfm_add_adst_adst_4x8_8bpc_avx2
+
+perf record -e probe:dav1d_inv_txfm_add_adst_adst_4x8_8bpc_avx2
+
+perf record -e probe:dav1d_inv_txfm_add_adst_adst_4x8_8bpc_avx2 target/debug/dav1d