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 d6455023a3af94fbc86c057bdcd80aba3d22b3db..9c7b7f0a57864b6d1f70f8631b0d1b19bbd4cb5b 100644 (file)
--- 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;