From: Marek Olšák <maraeo@gmail.com>
Date: Tue, 8 Mar 2011 05:37:50 +0000 (+0100)
Subject: r300/compiler: improve the detection of constants for constant folding
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4f3826117957b5ac1554b833af33d342360f655a;p=mesa.git

r300/compiler: improve the detection of constants for constant folding

Now the expression V==0 generates one instruction instead of two.
---

diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
index 5caff91b00e..3915cb475be 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
@@ -312,6 +312,13 @@ static void constant_folding(struct radeon_compiler * c, struct rc_instruction *
 		struct rc_src_register newsrc;
 		int have_real_reference;
 
+		if (inst->U.I.SrcReg[src].Swizzle == RC_SWIZZLE_1111 ||
+		    inst->U.I.SrcReg[src].Swizzle == RC_SWIZZLE_0000 ||
+		    inst->U.I.SrcReg[src].Swizzle == RC_SWIZZLE_HHHH) {
+			inst->U.I.SrcReg[src].File = RC_FILE_NONE;
+			continue;
+		}
+
 		if (inst->U.I.SrcReg[src].File != RC_FILE_CONSTANT ||
 		    inst->U.I.SrcReg[src].RelAddr ||
 		    inst->U.I.SrcReg[src].Index >= c->Program.Constants.Count)