fix wrongly referenced min/max in riscv_corev_alu.h, generate c-api tests. Remove exths/exthz intrinsics by replacing them with trunc+extend

Author: realqhc

clang/include/clang/Basic/BuiltinsRISCVXCV.td

@@ -23,8 +23,6 @@ let Attributes = [NoThrow, Const] in {
 //===----------------------------------------------------------------------===//
 def alu_slet  : RISCXCVBuiltin<"int(int, int)", "xcvalu">;
 def alu_sletu : RISCXCVBuiltin<"int(unsigned int, unsigned int)", "xcvalu">;
-def alu_minu  : RISCXCVBuiltin<"unsigned int(unsigned int, unsigned int)", "xcvalu">;
-def alu_maxu  : RISCXCVBuiltin<"unsigned int(unsigned int, unsigned int)", "xcvalu">;
 def alu_exths : RISCXCVBuiltin<"int(int)", "xcvalu">;
 def alu_exthz : RISCXCVBuiltin<"unsigned int(unsigned int)", "xcvalu">;
 def alu_extbs : RISCXCVBuiltin<"int(int)", "xcvalu">;

clang/lib/CodeGen/CGBuiltin.cpp

@@ -22451,18 +22451,13 @@ Value *CodeGenFunction::EmitRISCVBuiltinExpr(unsigned BuiltinID,
   case RISCV::BI__builtin_riscv_cv_alu_extbz:
     ID = Intrinsic::riscv_cv_alu_extbz;
     break;
-  case RISCV::BI__builtin_riscv_cv_alu_exths:
-    ID = Intrinsic::riscv_cv_alu_exths;
-    break;
+  case RISCV::BI__builtin_riscv_cv_alu_exths: {
+    return Builder.CreateSExt(Builder.CreateTrunc(Ops[0], Int16Ty), Int32Ty,
+                              "exths");
+  }
   case RISCV::BI__builtin_riscv_cv_alu_exthz:
-    ID = Intrinsic::riscv_cv_alu_exthz;
-    break;
-  case RISCV::BI__builtin_riscv_cv_alu_maxu:
-    ID = Intrinsic::riscv_cv_alu_maxu;
-    break;
-  case RISCV::BI__builtin_riscv_cv_alu_minu:
-    ID = Intrinsic::riscv_cv_alu_minu;
-    break;
+    return Builder.CreateZExt(Builder.CreateTrunc(Ops[0], Int16Ty), Int32Ty,
+                              "exthz");
   case RISCV::BI__builtin_riscv_cv_alu_slet:
     ID = Intrinsic::riscv_cv_alu_slet;
     break;
@@ -22484,7 +22479,8 @@ Value *CodeGenFunction::EmitRISCVBuiltinExpr(unsigned BuiltinID,
 
     // Vector builtins are handled from here.
 #include "clang/Basic/riscv_vector_builtin_cg.inc"
-  // SiFive Vector builtins are handled from here.
+
+    // SiFive Vector builtins are handled from here.
 #include "clang/Basic/riscv_sifive_vector_builtin_cg.inc"
   }
 

clang/lib/Headers/riscv_corev_alu.h

@@ -34,21 +34,21 @@ __riscv_cv_alu_sletu(unsigned long a, unsigned long b) {
 }
 
 static __inline__ long __DEFAULT_FN_ATTRS __riscv_cv_alu_min(long a, long b) {
-  return min(a, b);
+  return __builtin_elementwise_min(a, b);
 }
 
 static __inline__ unsigned long __DEFAULT_FN_ATTRS
 __riscv_cv_alu_minu(unsigned long a, unsigned long b) {
-  return __builtin_riscv_cv_alu_minu(a, b);
+  return __builtin_elementwise_min(a, b);
 }
 
 static __inline__ long __DEFAULT_FN_ATTRS __riscv_cv_alu_max(long a, long b) {
-  return max(a, b);
+  return __builtin_elementwise_max(a, b);
 }
 
 static __inline__ unsigned long __DEFAULT_FN_ATTRS
 __riscv_cv_alu_maxu(unsigned long a, unsigned long b) {
-  return __builtin_riscv_cv_alu_maxu(a, b);
+  return __builtin_elementwise_max(a, b);
 }
 
 static __inline__ long __DEFAULT_FN_ATTRS __riscv_cv_alu_exths(int16_t a) {