translate_sse: major rewrite (v5)

NOTE: Win64 is untested, and is thus currently disabled.
If you have such a system, please enable it and report whether it works.
To enable it, change src/gallium/auxiliary/translate/translate.c

Changes in v5:
- On Win64, preserve %xmm6 and %xmm7 as required by the ABI
- Use _WIN64 instead of WIN64

Changes in v4:
- Use x86_target() and x86_target_caps()
- Enable translate_sse in x86-64, but not in Win64

Changes in v3:
- Win64 support (untested)
- Use u_cpu_detect.h constants instead of #ifs

Changes in v2:
- Minimize #ifs
- Give a name to magic number CHANNELS_0001
- Add support for CPUs without SSE (only memcpy and swizzles, like non SSE2)
- Fixed comments

translate_sse is currently very limited to the point of
being useless in essentially all cases.

In particular, it only support some float32 and unorm8
formats and doesn't work on x86-64.

This commit rewrites it to support:
1. Dumb memory copy for any pair of identical formats
2. All formats that are swizzles of each other
3. Converting 32/64-bit floats and all 8/16/32-bit integers to 32-bit float
4. Converting unorm8/snorm8 to snorm16 and uscaled8/sscaled8 to sscaled16
5. Support for x86-64 (doesn't take advantage of it in any way though)

This new translate can even be useful to translate index buffers for
cards that lack 8-bit index support.

It passes the testsuite I wrote, but note that this is a major change, and more
testing would be great.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gallium/auxiliary/translate/translate.c b/src/gallium/auxiliary/translate/translate.c
index fe638e211f..03a7f050aa 100644
--- a/src/gallium/auxiliary/translate/translate.c
+++ b/src/gallium/auxiliary/translate/translate.c
@@ -38,7 +38,8 @@ struct translate *translate_create( const struct translate_key *key )
 {
    struct translate *translate = NULL;
 
-#if defined(PIPE_ARCH_X86)
+/* TODO: enable Win64 once it has actually been tested */
+#if defined(PIPE_ARCH_X86) || (defined(PIPE_ARCH_X86_64) && !defined(_WIN64))
    translate = translate_sse2_create( key );
    if (translate)
       return translate;