Mesa (master): r600g: fix reserve_cfile for R700+

[Christian König]

Module: Mesa
Branch: master
Commit: ba700d2ead3ae629ff29599455176fee72706698
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ba700d2ead3ae629ff29599455176fee72706698

Author: Christian König <deathsimple at vodafone.de>
Date:   Tue Jan 18 22:45:23 2011 +0100

r600g: fix reserve_cfile for R700+

According to R700 ISA we have only two channels for cfile constants.
This patch makes piglit tests "glsl1-constant array with constant
indexing" happy on RV710.

---

 src/gallium/drivers/r600/r600_asm.c |   36 ++++++++++++++++------------------
 1 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_asm.c b/src/gallium/drivers/r600/r600_asm.c
index 78cb60e..b9c74e9 100644
--- a/src/gallium/drivers/r600/r600_asm.c
+++ b/src/gallium/drivers/r600/r600_asm.c
@@ -539,26 +539,24 @@ static int reserve_gpr(struct alu_bank_swizzle *bs, unsigned sel, unsigned chan,
 	return 0;
 }
 
-static int reserve_cfile(struct alu_bank_swizzle *bs, unsigned sel, unsigned chan)
+static int reserve_cfile(struct r600_bc *bc, struct alu_bank_swizzle *bs, unsigned sel, unsigned chan)
 {
-	int res, resmatch = -1, resempty = -1;
-	for (res = 3; res >= 0; --res) {
-		if (bs->hw_cfile_addr[res] == -1)
-			resempty = res;
-		else if (bs->hw_cfile_addr[res] == sel &&
-			bs->hw_cfile_elem[res] == chan)
-			resmatch = res;
+	int res, num_res = 4;
+	if (bc->chiprev >= CHIPREV_R700) {
+		num_res = 2;
+		chan /= 2;
 	}
-	if (resmatch != -1)
-		return 0; // Read for this scalar element already reserved, nothing to do here.
-	else if (resempty != -1) {
-		bs->hw_cfile_addr[resempty] = sel;
-		bs->hw_cfile_elem[resempty] = chan;
-	} else {
-		// All cfile read ports are used, cannot reference vector element
-		return -1;
+	for (res = 0; res < num_res; ++res) {
+		if (bs->hw_cfile_addr[res] == -1) {
+			bs->hw_cfile_addr[res] = sel;
+			bs->hw_cfile_elem[res] = chan;
+			return 0;
+		} else if (bs->hw_cfile_addr[res] == sel &&
+			bs->hw_cfile_elem[res] == chan)
+			return 0; // Read for this scalar element already reserved, nothing to do here.
 	}
-	return 0;
+	// All cfile read ports are used, cannot reference vector element
+	return -1;
 }
 
 static int is_gpr(unsigned sel)
@@ -604,7 +602,7 @@ static int check_vector(struct r600_bc *bc, struct r600_bc_alu *alu,
 					return r;
 			}
 		} else if (is_cfile(sel)) {
-			r = reserve_cfile(bs, sel, elem);
+			r = reserve_cfile(bc, bs, sel, elem);
 			if (r)
 				return r;
 		}
@@ -631,7 +629,7 @@ static int check_scalar(struct r600_bc *bc, struct r600_bc_alu *alu,
 				const_count++;
 		}
 		if (is_cfile(sel)) {
-			r = reserve_cfile(bs, sel, elem);
+			r = reserve_cfile(bc, bs, sel, elem);
 			if (r)
 				return r;
 		}