[FFmpeg-devel] [PATCHv2 1/3] riscv: add Zvbb vector bit manipulation extension

["Rémi Denis-Courmont" <remi@remlab.net>]

---
 Makefile                  | 2 +-
 configure                 | 3 +++
 doc/APIchanges            | 3 +++
 ffbuild/arch.mak          | 1 +
 libavutil/cpu.c           | 1 +
 libavutil/cpu.h           | 1 +
 libavutil/tests/cpu.c     | 1 +
 tests/checkasm/checkasm.c | 1 +
 8 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index de727cbe00..4c3af09fec 100644
--- a/Makefile
+++ b/Makefile
@@ -101,7 +101,7 @@ SUBDIR_VARS := CLEANFILES FFLIBS HOSTPROGS TESTPROGS TOOLS               \
                ARMV5TE-OBJS ARMV6-OBJS ARMV8-OBJS VFP-OBJS NEON-OBJS     \
                ALTIVEC-OBJS VSX-OBJS MMX-OBJS X86ASM-OBJS                \
                MIPSFPU-OBJS MIPSDSPR2-OBJS MIPSDSP-OBJS MSA-OBJS         \
-               MMI-OBJS LSX-OBJS LASX-OBJS RV-OBJS RVV-OBJS              \
+               MMI-OBJS LSX-OBJS LASX-OBJS RV-OBJS RVV-OBJS RVVB-OBJS    \
                OBJS SLIBOBJS SHLIBOBJS STLIBOBJS HOSTOBJS TESTOBJS
 
 define RESET
diff --git a/configure b/configure
index beb1fa6d3c..2193905a54 100755
--- a/configure
+++ b/configure
@@ -2222,6 +2222,7 @@ ARCH_EXT_LIST_PPC="
 ARCH_EXT_LIST_RISCV="
     rv
     rvv
+    rv_zvbb
 "
 
 ARCH_EXT_LIST_X86="
@@ -2760,6 +2761,7 @@ power8_deps="vsx"
 
 rv_deps="riscv"
 rvv_deps="rv"
+rv_zvbb_deps="rvv"
 
 loongson2_deps="mips"
 loongson3_deps="mips"
@@ -6384,6 +6386,7 @@ elif enabled riscv; then
 
     enabled rv && check_inline_asm rv '".option arch, +zbb\nrev8 t0, t1"'
     enabled rvv && check_inline_asm rvv '".option arch, +v\nvsetivli zero, 0, e8, m1, ta, ma"'
+    enabled rv_zvbb && check_inline_asm rv_zvbb '".option arch, +zvbb\nvclz.v v0, v8"'
 
 elif enabled x86; then
 
diff --git a/doc/APIchanges b/doc/APIchanges
index 824beec9d3..238d22c135 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2024-03-07
 
 API changes, most recent first:
 
+2024-05-10 - xxxxxxxxx - lavu 59.18.100 - cpu.h
+  Add AV_CPU_FLAG_RV_ZVBB.
+
 2024-05-04 - xxxxxxxxxx - lavu 59.17.100 - opt.h
   Add AV_OPT_TYPE_UINT and av_opt_eval_uint().
 
diff --git a/ffbuild/arch.mak b/ffbuild/arch.mak
index 23a3feb090..3fc40e5e5d 100644
--- a/ffbuild/arch.mak
+++ b/ffbuild/arch.mak
@@ -17,6 +17,7 @@ OBJS-$(HAVE_VSX)     += $(VSX-OBJS) $(VSX-OBJS-yes)
 
 OBJS-$(HAVE_RV)      += $(RV-OBJS)      $(RV-OBJS-yes)
 OBJS-$(HAVE_RVV)     += $(RVV-OBJS)     $(RVV-OBJS-yes)
+OBJS-$(HAVE_RV_ZVBB) += $(RVVB-OBJS)    $(RVVB-OBJS-yes)
 
 OBJS-$(HAVE_MMX)     += $(MMX-OBJS)     $(MMX-OBJS-yes)
 OBJS-$(HAVE_X86ASM)  += $(X86ASM-OBJS)  $(X86ASM-OBJS-yes)
diff --git a/libavutil/cpu.c b/libavutil/cpu.c
index d4f947360a..396eeb38d6 100644
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@@ -192,6 +192,7 @@ int av_parse_cpu_caps(unsigned *flags, const char *s)
         { "zve64d",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_RVV_F64  },    .unit = "flags" },
         { "zba",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_RVB_ADDR },    .unit = "flags" },
         { "zbb",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_RVB_BASIC },   .unit = "flags" },
+        { "zvbb",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_RV_ZVBB },   .unit = "flags" },
 #endif
         { NULL },
     };
diff --git a/libavutil/cpu.h b/libavutil/cpu.h
index 8dff341886..cc19828d4b 100644
--- a/libavutil/cpu.h
+++ b/libavutil/cpu.h
@@ -90,6 +90,7 @@
 #define AV_CPU_FLAG_RVV_F64      (1 << 6) ///< Vectors of double's
 #define AV_CPU_FLAG_RVB_BASIC    (1 << 7) ///< Basic bit-manipulations
 #define AV_CPU_FLAG_RVB_ADDR     (1 << 8) ///< Address bit-manipulations
+#define AV_CPU_FLAG_RV_ZVBB      (1 << 9) ///< Vector basic bit-manipulations
 
 /**
  * Return the flags which specify extensions supported by the CPU.
diff --git a/libavutil/tests/cpu.c b/libavutil/tests/cpu.c
index d91bfeab5c..10e620963b 100644
--- a/libavutil/tests/cpu.c
+++ b/libavutil/tests/cpu.c
@@ -94,6 +94,7 @@ static const struct {
     { AV_CPU_FLAG_RVV_F32,   "zve32f"     },
     { AV_CPU_FLAG_RVV_I64,   "zve64x"     },
     { AV_CPU_FLAG_RVV_F64,   "zve64d"     },
+    { AV_CPU_FLAG_RV_ZVBB,   "zvbb"      },
 #endif
     { 0 }
 };
diff --git a/tests/checkasm/checkasm.c b/tests/checkasm/checkasm.c
index 9be32fc16e..9a05c1f95e 100644
--- a/tests/checkasm/checkasm.c
+++ b/tests/checkasm/checkasm.c
@@ -282,6 +282,7 @@ static const struct {
     { "RVVf32",   "rvv_f32",  AV_CPU_FLAG_RVV_F32 },
     { "RVVi64",   "rvv_i64",  AV_CPU_FLAG_RVV_I64 },
     { "RVVf64",   "rvv_f64",  AV_CPU_FLAG_RVV_F64 },
+    { "RV_Zvbb",  "rv_zvbb",  AV_CPU_FLAG_RV_ZVBB },
 #elif ARCH_MIPS
     { "MMI",      "mmi",      AV_CPU_FLAG_MMI },
     { "MSA",      "msa",      AV_CPU_FLAG_MSA },
-- 
2.43.0

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