glsl: Implement [iu]mulExtended() built-ins for ARB_gpu_shader5.

These built-ins have two "out" parameters, which makes implementing them
efficiently with our current compiler infrastructure difficult. Instead,
implement them in terms of the existing ir_binop_mul IR (to return the
low 32-bits) and a new ir_binop_mul64 which returns the high 32-bits.

v2: Rename mul64 -> imul_high as suggested by Ken.
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/glsl/ir_builder.cpp b/src/glsl/ir_builder.cpp
index b6ce889834c..6c49734bef8 100644
--- a/src/glsl/ir_builder.cpp
+++ b/src/glsl/ir_builder.cpp
@@ -216,6 +216,11 @@ ir_expression *mul(operand a, operand b)
    return expr(ir_binop_mul, a, b);
 }
 
+ir_expression *imul_high(operand a, operand b)
+{
+   return expr(ir_binop_imul_high, a, b);
+}
+
 ir_expression *div(operand a, operand b)
 {
    return expr(ir_binop_div, a, b);