Remove the old code using MMX registers.

There are only 8 MMX registers, each 64-bit wide, and they alias the
x87 registers. The access to the MMX register cannot use the new
VEX-prefix instructions either.

All of the functions being replaced are either present in the
qdrawhelper_sse2.cpp and qdrawhelper_ssse3.cpp files, or the plain C++
function in qdrawhelper.cpp is vectorised when compiled with
-ftree-vectorize (enabled in -O3), if SSE2 support is enabled.

All x86-64 processors have SSE2, so this is a net improvement for
64-bit builds. For 32-bit builds, without further support this will
cause the code to use non-vector or x87 instructions, which aren't the
best. The solution will come in another commit.

Change-Id: I4a22d8a2516b79172867510202d0fd627db54807
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gui/painting/qdrawhelper_sse2.cpp b/src/gui/painting/qdrawhelper_sse2.cpp
index 7b57d5c5e2..2c87aabe93 100644
--- a/src/gui/painting/qdrawhelper_sse2.cpp
+++ b/src/gui/painting/qdrawhelper_sse2.cpp
@@ -310,7 +310,7 @@ void QT_FASTCALL comp_func_solid_SourceOver_sse2(uint *destPixels, int length, u
     }
 }
 
-CompositionFunctionSolid qt_functionForModeSolid_onlySSE2[numCompositionFunctions] = {
+CompositionFunctionSolid qt_functionForModeSolid_SSE2[numCompositionFunctions] = {
     comp_func_solid_SourceOver_sse2,
     comp_func_solid_DestinationOver,
     comp_func_solid_Clear,
@@ -346,7 +346,7 @@ CompositionFunctionSolid qt_functionForModeSolid_onlySSE2[numCompositionFunction
     rasterop_solid_SourceAndNotDestination
 };
 
-CompositionFunction qt_functionForMode_onlySSE2[numCompositionFunctions] = {
+CompositionFunction qt_functionForMode_SSE2[numCompositionFunctions] = {
     comp_func_SourceOver_sse2,
     comp_func_DestinationOver,
     comp_func_Clear,