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    • Chris Lattner's avatar
      Instcombine: (A >> c1) << c2 for signed integers · ab780dfa
      Chris Lattner authored 
      llvm-svn: 7295
      ab780dfa
    • Chris Lattner's avatar
      Reorganization of code, no functional changes. · 3204d4ed
      Chris Lattner authored 
      Now it shoudl be a bit more efficient

llvm-svn: 7292
      3204d4ed
    • Chris Lattner's avatar
      Allow folding several instructions into casts, which can simplify a lot · dfae8be3
      Chris Lattner authored 
      of codes.  For example,
short kernel (short t1) {
  t1 >>= 8; t1 <<= 8;
  return t1;
}

became:

short %kernel(short %t1.1) {
        %tmp.3 = shr short %t1.1, ubyte 8               ; <short> [#uses=1]
        %tmp.5 = cast short %tmp.3 to int               ; <int> [#uses=1]
        %tmp.7 = shl int %tmp.5, ubyte 8                ; <int> [#uses=1]
        %tmp.8 = cast int %tmp.7 to short               ; <short> [#uses=1]
        ret short %tmp.8
}

before, now it becomes:
short %kernel(short %t1.1) {
        %tmp.3 = shr short %t1.1, ubyte 8               ; <short> [#uses=1]
        %tmp.8 = shl short %tmp.3, ubyte 8              ; <short> [#uses=1]
        ret short %tmp.8
}

which will become:
short %kernel(short %t1.1) {
        %tmp.3 = and short %t1.1, 0xFF00
        ret short %tmp.3
}

This implements cast-set.ll:test4 and test5

llvm-svn: 7290
      dfae8be3
  33. Jul 23, 2003