From: Eric Anholt <eric@anholt.net>
Date: Wed, 16 Jul 2014 16:09:05 +0000 (-0700)
Subject: vc4: Add more useful debug for the undefined-source case
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=32948ca768fec6debdcdafa58bce2b65c328250d;p=mesa.git

vc4: Add more useful debug for the undefined-source case

We could get undefined sources in real programs from the wild, so we'll
need to turn off this debug eventually.  But for now, using undefined
sources is typically me just mistyping something.
---

diff --git a/src/gallium/drivers/vc4/vc4_qpu_emit.c b/src/gallium/drivers/vc4/vc4_qpu_emit.c
index da47539af0f..6b047023e56 100644
--- a/src/gallium/drivers/vc4/vc4_qpu_emit.c
+++ b/src/gallium/drivers/vc4/vc4_qpu_emit.c
@@ -266,11 +266,18 @@ vc4_generate_code(struct qcompile *c)
                                 src[i] = qpu_rn(0);
                                 break;
                         case QFILE_TEMP:
-                                assert(reg_allocated[index] != -1);
-                                src[i] = allocate_to_qpu_reg[reg_allocated[index]];
-                                reg_uses_remaining[index]--;
-                                if (reg_uses_remaining[index] == 0)
-                                        reg_in_use[reg_allocated[index]] = false;
+                                if (reg_allocated[index] == -1) {
+                                        fprintf(stderr, "undefined reg use: ");
+                                        qir_dump_inst(qinst);
+                                        fprintf(stderr, "\n");
+
+                                        src[i] = qpu_rn(0);
+                                } else {
+                                        src[i] = allocate_to_qpu_reg[reg_allocated[index]];
+                                        reg_uses_remaining[index]--;
+                                        if (reg_uses_remaining[index] == 0)
+                                                reg_in_use[reg_allocated[index]] = false;
+                                }
                                 break;
                         case QFILE_UNIF:
                                 src[i] = qpu_unif();