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  15. Dec 20, 2003
    • Alkis Evlogimenos's avatar
      Remove floating point killer pass. This is now implemented in the · 68cff6bf
      Alkis Evlogimenos authored 
      instruction selector by adding a new pseudo-instruction
FP_REG_KILL. This instruction implicitly defines all x86 fp registers
and is a terminator so that passes which add machine code at the end
of basic blocks (like phi elimination) do not add instructions between
it and the branch or return instruction.

llvm-svn: 10562
      68cff6bf
  17. Oct 21, 2003
  19. Oct 20, 2003
    • Chris Lattner's avatar
      Emit x86 instructions for: A = B op C, where A and B are 16-bit registers, · 6acb1bed
      Chris Lattner authored 
      C is a constant which can be sign-extended from 8 bits without value loss,
and op is one of: add, sub, imul, and, or, xor.

This allows the JIT to emit the one byte version of the constant instead of
the two or 4 byte version.  Because these instructions are very common, this
can save a LOT of code space.  For example, I sampled two benchmarks, 176.gcc
and 254.gap.

BM        Old     New    Reduction
176.gcc 2673621 2548962  4.89%
254.gap  498261  475104  4.87%

Note that while the percentage is not spectacular, this did eliminate
124.6 _KILOBYTES_ of codespace from gcc.  Not bad.

Note that this doesn't effect the llc version at all, because the assembler
already does this optimization.

llvm-svn: 9284
      6acb1bed
    • Chris Lattner's avatar
      * Rename X86::IMULr16 -> X86::IMULrr16 · 97e1b557
      Chris Lattner authored 
      * Implement R1 = R2 * C where R1 and R2 are 32 or 16 bits. This avoids an
  extra copy into a register, reducing register pressure.

llvm-svn: 9278
      97e1b557
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