implement minmax intrinsics

Author: gnzlbg

src/librustc_llvm/ffi.rs

@@ -1242,6 +1242,9 @@ extern "C" {
                                          IsNaN: bool)
                                          -> ValueRef;
 
+    pub fn LLVMRustBuildMinNum(B: BuilderRef, LHS: ValueRef, LHS: ValueRef) -> ValueRef;
+    pub fn LLVMRustBuildMaxNum(B: BuilderRef, LHS: ValueRef, LHS: ValueRef) -> ValueRef;
+
     pub fn LLVMBuildIsNull(B: BuilderRef, Val: ValueRef, Name: *const c_char) -> ValueRef;
     pub fn LLVMBuildIsNotNull(B: BuilderRef, Val: ValueRef, Name: *const c_char) -> ValueRef;
     pub fn LLVMBuildPtrDiff(B: BuilderRef,

src/librustc_trans/builder.rs

@@ -910,6 +910,19 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         }
     }
 
+    pub fn minnum(&self, lhs: ValueRef, rhs: ValueRef) -> ValueRef {
+        self.count_insn("minnum");
+        unsafe {
+            llvm::LLVMRustBuildMinNum(self.llbuilder, lhs, rhs)
+        }
+    }
+    pub fn maxnum(&self, lhs: ValueRef, rhs: ValueRef) -> ValueRef {
+        self.count_insn("maxnum");
+        unsafe {
+            llvm::LLVMRustBuildMaxNum(self.llbuilder, lhs, rhs)
+        }
+    }
+
     pub fn select(&self, cond: ValueRef, then_val: ValueRef, else_val: ValueRef) -> ValueRef {
         self.count_insn("select");
         unsafe {

src/librustc_trans/intrinsic.rs

@@ -1405,6 +1405,8 @@ unsupported {} from `{}` with element `{}` of size `{}` to `{}`"#,
         simd_and: TyUint, TyInt => and;
         simd_or: TyUint, TyInt => or;
         simd_xor: TyUint, TyInt => xor;
+        simd_fmax: TyFloat => maxnum;
+        simd_fmin: TyFloat => minnum;
     }
     span_bug!(span, "unknown SIMD intrinsic");
 }

src/librustc_typeck/check/intrinsic.rs

@@ -355,7 +355,8 @@ pub fn check_platform_intrinsic_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         }
         "simd_add" | "simd_sub" | "simd_mul" | "simd_rem" |
         "simd_div" | "simd_shl" | "simd_shr" |
-        "simd_and" | "simd_or" | "simd_xor" => {
+        "simd_and" | "simd_or" | "simd_xor" |
+        "simd_fmin" | "simd_fmax" => {
             (1, vec![param(0), param(0)], param(0))
         }
         "simd_insert" => (2, vec![param(0), tcx.types.u32, param(1)], param(0)),

src/rustllvm/RustWrapper.cpp

@@ -1492,3 +1492,12 @@ LLVMRustBuildVectorReduceFMax(LLVMBuilderRef, LLVMValueRef, bool) {
   return nullptr;
 }
 #endif
+
+extern "C" LLVMValueRef
+LLVMRustBuildMinNum(LLVMBuilderRef B, LLVMValueRef LHS, LLVMValueRef RHS) {
+    return wrap(unwrap(B)->CreateMinNum(unwrap(LHS),unwrap(RHS)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildMaxNum(LLVMBuilderRef B, LLVMValueRef LHS, LLVMValueRef RHS) {
+    return wrap(unwrap(B)->CreateMaxNum(unwrap(LHS),unwrap(RHS)));
+}