glsl: Add new fma built-in IR and prototype from ARB_gpu_shader5.

Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/glsl/builtins/ir/fma.ir

@@ -0,0 +1,29 @@
+((function fma
+   (signature float
+     (parameters
+       (declare (in) float a)
+       (declare (in) float b)
+       (declare (in) float c))
+     ((return (expression float fma (var_ref a) (var_ref b) (var_ref c)))))
+
+   (signature vec2
+     (parameters
+       (declare (in) vec2 a)
+       (declare (in) vec2 b)
+       (declare (in) vec2 c))
+     ((return (expression vec2 fma (var_ref a) (var_ref b) (var_ref c)))))
+
+   (signature vec3
+     (parameters
+       (declare (in) vec3 a)
+       (declare (in) vec3 b)
+       (declare (in) vec3 c))
+     ((return (expression vec3 fma (var_ref a) (var_ref b) (var_ref c)))))
+
+   (signature vec4
+     (parameters
+       (declare (in) vec4 a)
+       (declare (in) vec4 b)
+       (declare (in) vec4 c))
+     ((return (expression vec4 fma (var_ref a) (var_ref b) (var_ref c)))))
+))

src/glsl/builtins/profiles/ARB_gpu_shader5.glsl

@@ -54,3 +54,8 @@ int   findMSB(uint  value);
 ivec2 findMSB(uvec2 value);
 ivec3 findMSB(uvec3 value);
 ivec4 findMSB(uvec4 value);
+
+float fma(float a, float b, float c);
+vec2  fma(vec2  a, vec2  b, vec2  c);
+vec3  fma(vec3  a, vec3  b, vec3  c);
+vec4  fma(vec4  a, vec4  b, vec4  c);