Fix vector packing regression.

When SSE4.1 isn't available, we were infinitely calling PackUnsigned()
recursively.

Bug b/37496082

Change-Id: Ie1fa8150d64740776c5b80baf07d997dde9d51be
Reviewed-on: https://swiftshader-review.googlesource.com/12929
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Casey Dahlin <sadmac@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index d67b182..b488bf9 100644 (file)
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -5983,7 +5983,7 @@ namespace sw
                        RValue<Int4> sy = As<Int4>(y);
                        RValue<Int4> by = (sy & ~(sy >> 31)) - Int4(0x8000);
 
-                       return PackUnsigned(bx, by) + UShort8(0x8000u);
+                       return As<UShort8>(PackSigned(bx, by) + Short8(0x8000u));
                }
        }