cuda: add ptx and sass syntax highlighting files

Author: danbev

gpu/cuda/.vim/syntax/ptx.vim

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+" SUPER LOUD PTX SYNTAX TEST
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Make comments obvious
+syntax match ptxComment "//.*$"
+hi! link ptxComment Comment
+
+" Make .entry and .func bright
+syntax match ptxEntry "\.entry"
+syntax match ptxFunc  "\.func"
+hi! link ptxEntry Identifier
+hi! link ptxFunc  Function
+
+" Make registers and types stand out
+syntax match ptxReg "%[a-zA-Z0-9_]\+"
+syntax match ptxType "\.\(u32\|u64\|s32\|s64\|f32\|f64\|pred\)"
+hi! link ptxReg  Constant
+hi! link ptxType Type
+
+let b:current_syntax = "ptx"
+

gpu/cuda/.vim/syntax/sasscuda.vim

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+" SUPER LOUD CUDA SASS SYNTAX TEST
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Comments like // something
+syntax match cudasassComment "//.*$"
+hi! link cudasassComment Comment
+
+" Common directives
+syntax match cudasassDir "\.\(header\|target\|address_size\|maxnreg\|minnctapersm\)"
+hi! link cudasassDir PreProc
+
+" Instructions (sample set – extend as you like)
+syntax keyword cudasassInstr MOV LDG STG LDS STS FFMA IMAD IADD SHF LOP3 BRA RET
+hi! link cudasassInstr Statement
+
+" Registers: R0, R12, etc.
+syntax match cudasassReg "\<R[0-9]\+\>"
+hi! link cudasassReg Constant
+
+" Predicates: P0, !P0, @P0, @!P0
+syntax match cudasassPred "@\?!\=P[0-9]\+"
+hi! link cudasassPred Identifier
+
+let b:current_syntax = "cudasass"

gpu/cuda/README.md

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+### CUDA examples
+
+
+### ptx and sass syntax highlighting
+Add the following to .vimrc:
+```
+au BufNewFile,BufRead *.ptx  set filetype=ptx
+au BufNewFile,BufRead *.sass set filetype=sasscuda
+```
+And then copy the two file in .vim/syntax to `~/.vim/syntax/`.