From: Fredrik Höglund <fredrik@kde.org>
Date: Wed, 15 Dec 2010 19:00:42 +0000 (+0100)
Subject: r600g: fix pow(0, 0) evaluating to NaN
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=66f55de31e15f97ad1d16c573756738218c02109;p=mesa.git

r600g: fix pow(0, 0) evaluating to NaN

We have to use the non-IEEE compliant version of MUL here, since
log2(0) is -inf, and 0 * -inf is NaN in IEEE arithmetic.

candidates for 7.10 branch
---

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index d6455023a3a..9c7b7f0a578 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -1451,7 +1451,7 @@ static int tgsi_pow(struct r600_shader_ctx *ctx)
 		return r;
 	/* b * LOG2(a) */
 	memset(&alu, 0, sizeof(struct r600_bc_alu));
-	alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_MUL_IEEE);
+	alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_MUL);
 	r = tgsi_src(ctx, &inst->Src[1], &alu.src[0]);
 	if (r)
 		return r;