gallivm: Allow indirection from TEMP registers too.

The ADDR file is cumbersome for native integer capable drivers.  We
should consider deprecating it eventually, but this just adds support
for indirection from TEMP registers.

Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c

@@ -533,9 +533,24 @@ get_indirect_index(struct lp_build_tgsi_soa_context *bld,
    base = lp_build_const_int_vec(bld->bld_base.base.gallivm, uint_bld->type, reg_index);
 
    assert(swizzle < 4);
-   rel = LLVMBuildLoad(builder,
-                        bld->addr[indirect_reg->Index][swizzle],
-                        "load addr reg");
+   switch (indirect_reg->File) {
+   case TGSI_FILE_ADDRESS:
+      rel = LLVMBuildLoad(builder,
+                          bld->addr[indirect_reg->Index][swizzle],
+                          "load addr reg");
+      /* ADDR LLVM values already have LLVM integer type. */
+      break;
+   case TGSI_FILE_TEMPORARY:
+      rel = lp_get_temp_ptr_soa(bld, indirect_reg->Index, swizzle);
+      rel = LLVMBuildLoad(builder, rel, "load temp reg");
+      /* TEMP LLVM values always have LLVM float type, but for indirection, the
+       * value actually stored is expected to be an integer */
+      rel = LLVMBuildBitCast(builder, rel, uint_bld->vec_type, "");
+      break;
+   default:
+      assert(0);
+      rel = uint_bld->zero;
+   }
 
    index = lp_build_add(uint_bld, base, rel);