On Fri, 3 May 2024, Rémi Denis-Courmont wrote:
This adds the Linux-specific function call to detect CPU features. Unlike
the more portable auxillary vector, this supports extensions other than
single lettered ones. At this point, FFmpeg already needs this to detect
Zba and Zbb at run-time, and probably will need it for Zvbb in the near
future.
Support will be available in glibc 2.40 onward.
---
configure | 3 +++
libavutil/riscv/cpu.c | 25 +++++++++++++++++++++++++
2 files changed, 28 insertions(+)
@@ -27,10 +29,33 @@
#include <sys/auxv.h>
#define HWCAP_RV(letter) (1ul << ((letter) - 'A'))
#endif
+#ifdef HAVE_SYS_HWPROBE_H
Aren't these kind of config.h macros always defined, but with the values
0/1? I.e., shouldn't this use #if instead of #ifdef?
// Martin
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