Mesa (master): gallivm: Allow indirection from TEMP registers too.

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: 3b7ce726258de20be2d65f7b9f51b160dd99638a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3b7ce726258de20be2d65f7b9f51b160dd99638a

Author: José Fonseca <jfonseca at vmware.com>
Date:   Tue Dec  4 16:54:41 2012 +0000

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 at vmware.com>

---

 src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c |   21 ++++++++++++++++++---
 1 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
index 9caac21..fbeb805 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
+++ b/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);