[WebAssembly] Lower SCALAR_TO_VECTOR to splats
Reviewers: aheejin
Subscribers: dschuff, sbc100, jgravelle-google, hiraditya, sunfish
Differential Revision: https://reviews.llvm.org/D57269
llvm-svn: 352568
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
index 2e40c5b..2476d8d 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
@@ -230,6 +230,19 @@
defm "" : Splat<v4f32, "f32x4", F32, splat4, 18>;
defm "" : Splat<v2f64, "f64x2", F64, splat2, 21>;
+// scalar_to_vector leaves high lanes undefined, so can be a splat
+class ScalarSplatPat<ValueType vec_t, ValueType lane_t,
+ WebAssemblyRegClass reg_t> :
+ Pat<(vec_t (scalar_to_vector (lane_t reg_t:$x))),
+ (!cast<Instruction>("SPLAT_"#vec_t) reg_t:$x)>;
+
+def : ScalarSplatPat<v16i8, i32, I32>;
+def : ScalarSplatPat<v8i16, i32, I32>;
+def : ScalarSplatPat<v4i32, i32, I32>;
+def : ScalarSplatPat<v2i64, i64, I64>;
+def : ScalarSplatPat<v4f32, f32, F32>;
+def : ScalarSplatPat<v2f64, f64, F64>;
+
//===----------------------------------------------------------------------===//
// Accessing lanes
//===----------------------------------------------------------------------===//