From: Marek Olšák <maraeo@gmail.com>
Date: Tue, 25 Sep 2012 15:20:38 +0000 (+0200)
Subject: r600g: fix RSQ of negative value on Cayman
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fd5c5384648a0d6191c19748a2d1f1148c5ee98f;p=mesa.git

r600g: fix RSQ of negative value on Cayman

NOTE: This is a candidate for the stable branches.
---

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 6e475933175..7df549ba702 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -1888,6 +1888,11 @@ static int cayman_emit_float_instr(struct r600_shader_ctx *ctx)
 		alu.inst = ctx->inst_info->r600_opcode;
 		for (j = 0; j < inst->Instruction.NumSrcRegs; j++) {
 			r600_bytecode_src(&alu.src[j], &ctx->src[j], 0);
+
+			/* RSQ should take the absolute value of src */
+			if (ctx->inst_info->tgsi_opcode == TGSI_OPCODE_RSQ) {
+				r600_bytecode_src_set_abs(&alu.src[j]);
+			}
 		}
 		tgsi_dst(ctx, &inst->Dst[0], i, &alu.dst);
 		alu.dst.write = (inst->Dst[0].Register.WriteMask >> i) & 1;