[WebAssembly] Fold setne and seteq comparisons into selects.

[oota-llvm.git] / lib / Target / WebAssembly / WebAssemblyInstrFloat.td

diff --git a/lib/Target/WebAssembly/WebAssemblyInstrFloat.td b/lib/Target/WebAssembly/WebAssemblyInstrFloat.td
index 59d2e6b474ea8c524916725e093f4842d570a4b7..0d819581621e210ed588023c90a282a953579270 100644 (file)
--- a/lib/Target/WebAssembly/WebAssemblyInstrFloat.td
+++ b/lib/Target/WebAssembly/WebAssemblyInstrFloat.td
@@ -12,34 +12,42 @@
 ///
 //===----------------------------------------------------------------------===//
 
-defm ADD : BinaryFP<fadd, "add">;
-defm SUB : BinaryFP<fsub, "sub">;
-defm MUL : BinaryFP<fmul, "mul">;
-defm DIV : BinaryFP<fdiv, "div">;
+let Defs = [ARGUMENTS] in {
+
+defm ADD : BinaryFP<fadd, "add ">;
+defm SUB : BinaryFP<fsub, "sub ">;
+defm MUL : BinaryFP<fmul, "mul ">;
+defm DIV : BinaryFP<fdiv, "div ">;
 defm SQRT : UnaryFP<fsqrt, "sqrt">;
 
-defm ABS : UnaryFP<fabs, "abs">;
-defm NEG : UnaryFP<fneg, "neg">;
+defm ABS : UnaryFP<fabs, "abs ">;
+defm NEG : UnaryFP<fneg, "neg ">;
 defm COPYSIGN : BinaryFP<fcopysign, "copysign">;
 
-defm MIN : BinaryFP<fminnan, "min">;
-defm MAX : BinaryFP<fmaxnan, "max">;
+defm MIN : BinaryFP<fminnan, "min ">;
+defm MAX : BinaryFP<fmaxnan, "max ">;
 
 defm CEIL : UnaryFP<fceil, "ceil">;
 defm FLOOR : UnaryFP<ffloor, "floor">;
 defm TRUNC : UnaryFP<ftrunc, "trunc">;
 defm NEAREST : UnaryFP<fnearbyint, "nearest">;
 
+} // Defs = [ARGUMENTS]
+
 // WebAssembly doesn't expose inexact exceptions, so map frint to fnearbyint.
 def : Pat<(frint f32:$src), (NEAREST_F32 f32:$src)>;
 def : Pat<(frint f64:$src), (NEAREST_F64 f64:$src)>;
 
-defm EQ : ComparisonFP<SETOEQ, "eq">;
-defm NE : ComparisonFP<SETUNE, "ne">;
-defm LT : ComparisonFP<SETOLT, "lt">;
-defm LE : ComparisonFP<SETOLE, "le">;
-defm GT : ComparisonFP<SETOGT, "gt">;
-defm GE : ComparisonFP<SETOGE, "ge">;
+let Defs = [ARGUMENTS] in {
+
+defm EQ : ComparisonFP<SETOEQ, "eq  ">;
+defm NE : ComparisonFP<SETUNE, "ne  ">;
+defm LT : ComparisonFP<SETOLT, "lt  ">;
+defm LE : ComparisonFP<SETOLE, "le  ">;
+defm GT : ComparisonFP<SETOGT, "gt  ">;
+defm GE : ComparisonFP<SETOGE, "ge  ">;
+
+} // Defs = [ARGUMENTS]
 
 // Don't care floating-point comparisons, supported via other comparisons.
 def : Pat<(seteq f32:$lhs, f32:$rhs), (EQ_F32 f32:$lhs, f32:$rhs)>;
@@ -55,9 +63,27 @@ def : Pat<(setle f64:$lhs, f64:$rhs), (LE_F64 f64:$lhs, f64:$rhs)>;
 def : Pat<(setgt f64:$lhs, f64:$rhs), (GT_F64 f64:$lhs, f64:$rhs)>;
 def : Pat<(setge f64:$lhs, f64:$rhs), (GE_F64 f64:$lhs, f64:$rhs)>;
 
+let Defs = [ARGUMENTS] in {
+
 def SELECT_F32 : I<(outs F32:$dst), (ins I32:$cond, F32:$lhs, F32:$rhs),
                    [(set F32:$dst, (select I32:$cond, F32:$lhs, F32:$rhs))],
                    "f32.select\t$dst, $cond, $lhs, $rhs">;
 def SELECT_F64 : I<(outs F64:$dst), (ins I32:$cond, F64:$lhs, F64:$rhs),
                    [(set F64:$dst, (select I32:$cond, F64:$lhs, F64:$rhs))],
                    "f64.select\t$dst, $cond, $lhs, $rhs">;
+
+} // Defs = [ARGUMENTS]
+
+// ISD::SELECT requires its operand to conform to getBooleanContents, but
+// WebAssembly's select interprets any non-zero value as true, so we can fold
+// a setne with 0 into a select.
+def : Pat<(select (i32 (setne I32:$cond, 0)), F32:$lhs, F32:$rhs),
+          (SELECT_F32 I32:$cond, F32:$lhs, F32:$rhs)>;
+def : Pat<(select (i32 (setne I32:$cond, 0)), F64:$lhs, F64:$rhs),
+          (SELECT_F64 I32:$cond, F64:$lhs, F64:$rhs)>;
+
+// And again, this time with seteq instead of setne and the arms reversed.
+def : Pat<(select (i32 (seteq I32:$cond, 0)), F32:$lhs, F32:$rhs),
+          (SELECT_F32 I32:$cond, F32:$rhs, F32:$lhs)>;
+def : Pat<(select (i32 (seteq I32:$cond, 0)), F64:$lhs, F64:$rhs),
+          (SELECT_F64 I32:$cond, F64:$rhs, F64:$lhs)>;