Support RVV v0.12 intrinsics for row_rvv.cc & scale_rvv.cc

1. Add two defined marco LIBYUV_RVV_HAS_TUPLE_TYPE & LIBYUV_RVV_HAS_VXRM_ARG

Intrinsic v0.12 introduces
- tuple type in segment load & store
- vxrm argument in fixed-point intrinsics (e.g vnclip)

These two marcos are controled by __riscv_v_intrinsic.

2. Support RVV v0.12 intrinsics in row_rvv.cc & scale_rvv.cc

Change-Id: I921f91d9dc8fdda031e7b6647d0e296aa2793c39
Signed-off-by: Bruce Lai <bruce.lai@sifive.com>
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4767120
Reviewed-by: Frank Barchard <fbarchard@chromium.org>

include/libyuv/row.h

@@ -841,8 +841,15 @@ extern "C" {
 #endif
 
 #if !defined(LIBYUV_DISABLE_RVV) && defined(__riscv_vector)
+#if __riscv_v_intrinsic > 11000
+// Since v0.12, TUPLE_TYPE is introduced for segment load and store.
+#define LIBYUV_RVV_HAS_TUPLE_TYPE
+// Since v0.12, VXRM(fixed-point rounding mode) is included in arguments of
+// fixed-point intrinsics.
+#define LIBYUV_RVV_HAS_VXRM_ARG
+#endif
+
 #define HAS_COPYROW_RVV
-#if __riscv_v_intrinsic == 11000
 #define HAS_AB64TOARGBROW_RVV
 #define HAS_ABGRTOYJROW_RVV
 #define HAS_ABGRTOYROW_RVV
@@ -900,7 +907,6 @@ extern "C" {
 #define HAS_SPLITUVROW_RVV
 #define HAS_SPLITXRGBROW_RVV
 #endif
-#endif
 
 #if defined(_MSC_VER) && !defined(__CLR_VER) && !defined(__clang__)
 #if defined(VISUALC_HAS_AVX2)

include/libyuv/scale_row.h

@@ -184,7 +184,6 @@ extern "C" {
 // #define HAS_SCALEARGBROWDOWNEVEN_RVV
 #define HAS_SCALEUVROWDOWN4_RVV
 #define HAS_SCALEUVROWDOWNEVEN_RVV
-#if __riscv_v_intrinsic == 11000
 #define HAS_SCALEARGBROWDOWN2_RVV
 #define HAS_SCALEARGBROWDOWN2BOX_RVV
 #define HAS_SCALEARGBROWDOWN2LINEAR_RVV
@@ -208,7 +207,6 @@ extern "C" {
 #define HAS_SCALEUVROWUP2_BILINEAR_RVV
 #define HAS_SCALEUVROWUP2_LINEAR_RVV
 #endif
-#endif
 
 // Scale ARGB vertically with bilinear interpolation.
 void ScalePlaneVertical(int src_height,

riscv_script/riscv-clang.cmake

@@ -43,6 +43,7 @@ if(RISCV_COMPILER_FLAGS STREQUAL "")
     list(APPEND RISCV_COMPILER_FLAGS "-march=rv64gc")
   endif()
 endif()
+add_compile_options("-Wuninitialized")
 message(STATUS "RISCV_COMPILER_FLAGS: ${RISCV_COMPILER_FLAGS}")
 
 set(CMAKE_C_FLAGS             "${RISCV_COMPILER_FLAGS} ${CMAKE_C_FLAGS}")