Mesa (7.10): r600g: fix pow(0, 0) evaluating to NaN

[Alex Deucher]

Module: Mesa
Branch: 7.10
Commit: aa196d047c2d42835f3f6f25ac304b312f33f4f9
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=aa196d047c2d42835f3f6f25ac304b312f33f4f9

Author: Fredrik Höglund <fredrik at kde.org>
Date:   Wed Dec 15 20:00:42 2010 +0100

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

---

 src/gallium/drivers/r600/r600_shader.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index d645502..9c7b7f0 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;