From 8cae9f2fda37b9868ea973a665e1acc115172b45 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Tue, 18 Aug 2015 22:19:12 -0700 Subject: [PATCH] vc4: Add algebraic opt for rcp(1.0). We're generating rcps as part of backend lowering of the packed coordinate in the CS, and we don't want to lower them in NIR because of the extra newton-raphson steps in the common case. However, GLB2.7 is moving a vertex attribute with a 1.0 W component to the position, and that makes us produce some silly RCPs. total instructions in shared programs: 97590 -> 97580 (-0.01%) instructions in affected programs: 74 -> 64 (-13.51%) --- src/gallium/drivers/vc4/vc4_opt_algebraic.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/gallium/drivers/vc4/vc4_opt_algebraic.c b/src/gallium/drivers/vc4/vc4_opt_algebraic.c index 77028bc026f..5b435832b92 100644 --- a/src/gallium/drivers/vc4/vc4_opt_algebraic.c +++ b/src/gallium/drivers/vc4/vc4_opt_algebraic.c @@ -275,6 +275,14 @@ qir_opt_algebraic(struct vc4_compile *c) } break; + case QOP_RCP: + if (is_1f(c, inst->src[0])) { + replace_with_mov(c, inst, inst->src[0]); + progress = true; + break; + } + break; + default: break; } -- 2.30.2