Add support for Vector Negative Multiply Subtract Float on PowerPC

Author: lu-zero

src/etc/platform-intrinsics/powerpc.json

@@ -227,6 +227,13 @@
             "ret": "f32",
             "args": ["0", "0", "0"]
         },
+        {
+            "intrinsic": "nmsub",
+            "width": [128],
+            "llvm": "vnmsubfp",
+            "ret": "f32",
+            "args": ["0", "0", "0"]
+        },
         {
             "intrinsic": "expte",
             "width": [128],

src/librustc_platform_intrinsics/powerpc.rs

@@ -402,6 +402,11 @@ pub fn find(name: &str) -> Option<Intrinsic> {
             output: &::F32x4,
             definition: Named("llvm.ppc.altivec.vmaddfp")
         },
+        "_vec_nmsub" => Intrinsic {
+            inputs: { static INPUTS: [&'static Type; 3] = [&::F32x4, &::F32x4, &::F32x4]; &INPUTS },
+            output: &::F32x4,
+            definition: Named("llvm.ppc.altivec.vnmsubfp")
+        },
         "_vec_expte" => Intrinsic {
             inputs: { static INPUTS: [&'static Type; 1] = [&::F32x4]; &INPUTS },
             output: &::F32x4,