Mesa (9.0): r600g: fix RSQ of negative value on Cayman

[Marek Olšák]

Module: Mesa
Branch: 9.0
Commit: fc62ee7e0d642e084175f36433aa42af63400799
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fc62ee7e0d642e084175f36433aa42af63400799

Author: Marek Olšák <maraeo at gmail.com>
Date:   Tue Sep 25 17:20:38 2012 +0200

r600g: fix RSQ of negative value on Cayman

NOTE: This is a candidate for the stable branches.
(cherry picked from commit fd5c5384648a0d6191c19748a2d1f1148c5ee98f)

---

 src/gallium/drivers/r600/r600_shader.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 834c0b3..2eda741 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -1878,6 +1878,11 @@ 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;