diff --git a/src/gallium/drivers/r300/compiler/radeon_program_alu.c b/src/gallium/drivers/r300/compiler/radeon_program_alu.c
index 5d76e5b6b97..5e32e7b1fd0 100644
--- a/src/gallium/drivers/r300/compiler/radeon_program_alu.c
+++ b/src/gallium/drivers/r300/compiler/radeon_program_alu.c
@@ -294,12 +294,30 @@ static void transform_TRUNC(struct radeon_compiler* c,
 	 * The multiplication by sgn(x) can be simplified using CMP:
 	 *   y * sgn(x) = (x < 0 ? -y : y)
 	 */
+	 
+	struct rc_src_register abs;
+	
+	if (c->is_r500) {
+		abs = absolute(inst->U.I.SrcReg[0]);
+	} else {
+		/* abs isn't free on r300/r400, so we want
+		 * to avoid doing it twice
+		 */
+		int tmp = rc_find_free_temporary(c);
+
+		emit2(c, inst->Prev, RC_OPCODE_MAX, NULL, dstregtmpmask(tmp, RC_MASK_XYZW),
+			  srcregswz(inst->U.I.SrcReg[0].File, inst->U.I.SrcReg[0].Index, RC_SWIZZLE_XYZW),
+		      negate(srcregswz(inst->U.I.SrcReg[0].File, inst->U.I.SrcReg[0].Index, RC_SWIZZLE_XYZW)));
+		abs = srcregswz(RC_FILE_TEMPORARY, tmp, inst->U.I.SrcReg[0].Swizzle);
+
+	}
 	struct rc_dst_register dst = try_to_reuse_dst(c, inst);
-	emit1(c, inst->Prev, RC_OPCODE_FRC, NULL, dst, absolute(inst->U.I.SrcReg[0]));
-	emit2(c, inst->Prev, RC_OPCODE_ADD, NULL, dst, absolute(inst->U.I.SrcReg[0]),
+	emit1(c, inst->Prev, RC_OPCODE_FRC, NULL, dst, abs);
+	emit2(c, inst->Prev, RC_OPCODE_ADD, NULL, dst, abs,
 	      negate(srcreg(RC_FILE_TEMPORARY, dst.Index)));
 	emit3(c, inst->Prev, RC_OPCODE_CMP, &inst->U.I, inst->U.I.DstReg, inst->U.I.SrcReg[0],
 	      negate(srcreg(RC_FILE_TEMPORARY, dst.Index)), srcreg(RC_FILE_TEMPORARY, dst.Index));
+
 	rc_remove_instruction(inst);
 }