nir: Add an opcode for stomping a 32-bit value to 16-bit precision

This correlates directly to the SPIR-V opcode OpQuantizeToF16

Reviewed-by: Rob Clark <robdclark@gmail.com>

diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py
index 553f924afc5e9b30ea87e0419579ae77670f98e0..bc9845036d356c0061b95202cda875d239746d40 100644 (file)
--- a/src/compiler/nir/nir_opcodes.py
+++ b/src/compiler/nir/nir_opcodes.py
@@ -180,6 +180,7 @@ unop("ffloor", tfloat, "bit_size == 64 ? floor(src0) : floorf(src0)")
 unop("ffract", tfloat, "src0 - (bit_size == 64 ? floor(src0) : floorf(src0))")
 unop("fround_even", tfloat, "bit_size == 64 ? _mesa_roundeven(src0) : _mesa_roundevenf(src0)")
 
+unop("fquantize2f16", tfloat, "(fabs(src0) < ldexpf(1.0, -14)) ? copysignf(0.0f, src0) : _mesa_half_to_float(_mesa_float_to_half(src0))")
 
 # Trigonometric operations.