Auto merge of #49249 - gnzlbg:simd_minmax, r=alexcrichton

implement minmax intrinsics

This adds the `simd_{fmin,fmax}` intrinsics, which do a vertical (lane-wise) `min`/`max` for floating point vectors that's equivalent to Rust's `min`/`max` for `f32`/`f64`.

It might make sense to make `{f32,f64}::{min,max}` use the `minnum` and `minmax` intrinsics as well.

---

~~HELP: I need some help with these. Either I should go to sleep or there must be something that I must be missing. AFAICT I am calling the `maxnum` builder correctly, yet rustc/LLVM seem to insert a call to `llvm.minnum` there instead...~~ EDIT: Rust's LLVM version is too old :/

1 files changed, 20 insertions, 0 deletions

diff --git a/src/rustllvm/RustWrapper.cpp b/src/rustllvm/RustWrapper.cpp
index 0ef9643f4ca..df8602d0803 100644
--- a/src/rustllvm/RustWrapper.cpp
+++ b/src/rustllvm/RustWrapper.cpp
@@ -1503,3 +1503,23 @@ LLVMBuildExactUDiv(LLVMBuilderRef B, LLVMValueRef LHS,
   return wrap(unwrap(B)->CreateExactUDiv(unwrap(LHS), unwrap(RHS), Name));
 }
 #endif
+
+#if LLVM_VERSION_GE(6, 0)
+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)));
+}
+#else
+extern "C" LLVMValueRef
+LLVMRustBuildMinNum(LLVMBuilderRef, LLVMValueRef, LLVMValueRef) {
+   return nullptr;
+}
+extern "C" LLVMValueRef
+LLVMRustBuildMaxNum(LLVMBuilderRef, LLVMValueRef, LLVMValueRef) {
+   return nullptr;
+}
+#endif