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riscv: set fast half-precision conversion

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This is only supported at compilation time. If Zfhmin is supported, then
conversions are fast, which is what the flag is used for. At this time,
run-tiem detection is not possible, as in not supported by Linux. But even
if it were, the current FFmpeg approach seems unable to deal with it (same
problem as on x86, really).
This commit is contained in:
Rémi Denis-Courmont 2023-11-16 20:36:05 +02:00
parent a9205620b1
commit 954d50e2ae
1 changed files with 3 additions and 0 deletions
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3
configure vendored
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@ -5413,6 +5413,9 @@ elif enabled riscv; then
if test_cpp_condition stddef.h "__riscv_zbb"; then if test_cpp_condition stddef.h "__riscv_zbb"; then
enable fast_clz enable fast_clz
fi fi
if test_cpp_condition stddef.h "__riscv_zfhmin"; then
enable fast_float16
fi
elif enabled sparc; then elif enabled sparc; then