freedreno/a3xx/compiler: avoid negative register ids

In some cases, we need a register to be assigned up to three components
before the base.  Since we can't have negative register #'s, just shift
everything up.  May increase register usage for trivial shaders, but I
don't think we are shader limited in those cases.  A proper solution is
going to require a better register assignment algorithm (which is on the
TODO list), this is just a hack to get us by until then.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

diff --git a/src/gallium/drivers/freedreno/a3xx/ir3_ra.c b/src/gallium/drivers/freedreno/a3xx/ir3_ra.c
index d926483..4e48ede 100644 (file)
--- a/src/gallium/drivers/freedreno/a3xx/ir3_ra.c
+++ b/src/gallium/drivers/freedreno/a3xx/ir3_ra.c
@@ -104,8 +104,8 @@ static int output_base(struct ir3_ra_ctx *ctx)
         */
        if (ctx->type == SHADER_FRAGMENT) {
                if (ctx->half_precision)
-                       return ctx->frag_face ? 1 : 0;
-               return ctx->frag_coord ? 6 : 2;
+                       return ctx->frag_face ? 4 : 3;
+               return ctx->frag_coord ? 8 : 4;
        }
        return 0;
 }