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i965: Use rcp in brw_lower_texture_gradients rather than 1.0 / x.

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That's what it's for.  Plus, we actually implement rcp.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kenneth Graunke
2016-01-05 04:46:33 -08:00
parent 3d402d4450
commit 25b7e4a01f
1 changed files with 1 additions and 1 deletions
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src/mesa/drivers/dri/i965/brw_lower_texture_gradients.cpp
+1 -1
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@@ -279,7 +279,7 @@ lower_texture_grad_visitor::visit_leave(ir_texture *ir)
/* 2. quotient rule */
ir_variable *recip = temp(mem_ctx, glsl_type::float_type, "recip");
EMIT(assign(recip, div(new(mem_ctx) ir_constant(1.0f), swizzle_z(Q))));
EMIT(assign(recip, expr(ir_unop_rcp, swizzle_z(Q))));
ir_variable *dx = temp(mem_ctx, glsl_type::vec2_type, "dx");
ir_variable *dy = temp(mem_ctx, glsl_type::vec2_type, "dy");