[WebAssembly] Support wasm select operator

Summary:
Add support for wasm's select operator, and lower LLVM's select DAG node
to it.

Reviewers: sunfish

Subscribers: dschuff, llvm-commits, jfb

Differential Revision: http://reviews.llvm.org/D14295

llvm-svn: 252002

2 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrFloat.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrFloat.td
index 456b2f69eb1..7f342c353e1 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrFloat.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrFloat.td
@@ -58,3 +58,8 @@ def : Pat<(setge f64:$lhs, f64:$rhs), (GE_F64 f64:$lhs, f64:$rhs)>;
  * f32.min: minimum (binary operator); if either operand is NaN, returns NaN
  * f32.max: maximum (binary operator); if either operand is NaN, returns NaN
  */
+
+def SELECT_F32 : I<(outs F32:$dst), (ins I32:$cond, F32:$lhs, F32:$rhs),
+               [(set F32:$dst, (select I32:$cond, F32:$lhs, F32:$rhs))]>;
+def SELECT_F64 : I<(outs F64:$dst), (ins I32:$cond, F64:$lhs, F64:$rhs),
+               [(set F64:$dst, (select I32:$cond, F64:$lhs, F64:$rhs))]>;
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrInteger.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrInteger.td
index 6a28a13eb3b..ad036017e81 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrInteger.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrInteger.td
@@ -46,3 +46,8 @@ def : Pat<(ctlz_zero_undef I32:$src), (CLZ_I32 I32:$src)>;
 def : Pat<(ctlz_zero_undef I64:$src), (CLZ_I64 I64:$src)>;
 def : Pat<(cttz_zero_undef I32:$src), (CTZ_I32 I32:$src)>;
 def : Pat<(cttz_zero_undef I64:$src), (CTZ_I64 I64:$src)>;
+
+def SELECT_I32 : I<(outs I32:$dst), (ins I32:$cond, I32:$lhs, I32:$rhs),
+               [(set I32:$dst, (select I32:$cond, I32:$lhs, I32:$rhs))]>;
+def SELECT_I64 : I<(outs I64:$dst), (ins I32:$cond, I64:$lhs, I64:$rhs),
+               [(set I64:$dst, (select I32:$cond, I64:$lhs, I64:$rhs))]>;