Mesa (master): gallivm: Fix vector constant for shuffle

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: 86902b513469635bb0bc027db0500e2f4d6c498d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=86902b513469635bb0bc027db0500e2f4d6c498d

Author: Adhemerval Zanella <azanella at linux.vnet.ibm.com>
Date:   Thu Nov 22 13:42:45 2012 -0600

gallivm: Fix vector constant for shuffle

This patch fixes the vector constant generation used for vector shuffle
for big-endian machines.

Reviewed-by: Roland Scheidegger <sroland at vmware.com>
Reviewed-by: Jose Fonseca <jfonseca at vmware.com>

---

 src/gallium/auxiliary/gallivm/lp_bld_pack.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_pack.c b/src/gallium/auxiliary/gallivm/lp_bld_pack.c
index f46c080..9eb9ab0 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_pack.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_pack.c
@@ -129,7 +129,8 @@ lp_build_const_unpack_shuffle_half(struct gallivm_state *gallivm,
 }
 
 /**
- * Build shuffle vectors that match PACKxx instructions.
+ * Build shuffle vectors that match PACKxx (SSE) instructions or
+ * VPERM (Altivec).
  */
 static LLVMValueRef
 lp_build_const_pack_shuffle(struct gallivm_state *gallivm, unsigned n)
@@ -140,7 +141,11 @@ lp_build_const_pack_shuffle(struct gallivm_state *gallivm, unsigned n)
    assert(n <= LP_MAX_VECTOR_LENGTH);
 
    for(i = 0; i < n; ++i)
+#ifdef PIPE_ARCH_LITTLE_ENDIAN
       elems[i] = lp_build_const_int32(gallivm, 2*i);
+#else
+      elems[i] = lp_build_const_int32(gallivm, 2*i+1);
+#endif
 
    return LLVMConstVector(elems, n);
 }