Add support for Vector Subtract Saturated on PowerPC

Author: lu-zero

src/etc/platform-intrinsics/powerpc.json

@@ -72,6 +72,13 @@
             "llvm": "vmin{0.kind}{0.data_type_short}",
             "ret": "i(8-32)",
             "args": ["0", "0"]
+        },
+        {
+            "intrinsic": "sub{0.kind}{0.data_type_short}s",
+            "width": [128],
+            "llvm": "vsub{0.kind}{0.data_type_short}s",
+            "ret": "i(8-32)",
+            "args": ["0", "0"]
         }
     ]
 }

src/librustc_platform_intrinsics/powerpc.rs

@@ -142,6 +142,36 @@ pub fn find(name: &str) -> Option<Intrinsic> {
             output: &::U32x4,
             definition: Named("llvm.ppc.altivec.vminuw")
         },
+        "_vec_subsbs" => Intrinsic {
+            inputs: { static INPUTS: [&'static Type; 2] = [&::I8x16, &::I8x16]; &INPUTS },
+            output: &::I8x16,
+            definition: Named("llvm.ppc.altivec.vsubsbs")
+        },
+        "_vec_sububs" => Intrinsic {
+            inputs: { static INPUTS: [&'static Type; 2] = [&::U8x16, &::U8x16]; &INPUTS },
+            output: &::U8x16,
+            definition: Named("llvm.ppc.altivec.vsububs")
+        },
+        "_vec_subshs" => Intrinsic {
+            inputs: { static INPUTS: [&'static Type; 2] = [&::I16x8, &::I16x8]; &INPUTS },
+            output: &::I16x8,
+            definition: Named("llvm.ppc.altivec.vsubshs")
+        },
+        "_vec_subuhs" => Intrinsic {
+            inputs: { static INPUTS: [&'static Type; 2] = [&::U16x8, &::U16x8]; &INPUTS },
+            output: &::U16x8,
+            definition: Named("llvm.ppc.altivec.vsubuhs")
+        },
+        "_vec_subsws" => Intrinsic {
+            inputs: { static INPUTS: [&'static Type; 2] = [&::I32x4, &::I32x4]; &INPUTS },
+            output: &::I32x4,
+            definition: Named("llvm.ppc.altivec.vsubsws")
+        },
+        "_vec_subuws" => Intrinsic {
+            inputs: { static INPUTS: [&'static Type; 2] = [&::U32x4, &::U32x4]; &INPUTS },
+            output: &::U32x4,
+            definition: Named("llvm.ppc.altivec.vsubuws")
+        },
         _ => return None,
     })
 }