llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-16 14:31:59 +00:00

History

David Majnemer b1b738e036 InstCombine: (icmp eq B, 0) | (icmp ult A, B) -> (icmp ule A, B-1)

This transform allows us to turn IR that looks like:
  %1 = icmp eq i64 %b, 0
  %2 = icmp ult i64 %a, %b
  %3 = or i1 %1, %2
  ret i1 %3

into:
  %0 = add i64 %b, -1
  %1 = icmp uge i64 %0, %a
  ret i1 %1

which means we go from lowering:
        cmpq    %rsi, %rdi
        setb    %cl
        testq   %rsi, %rsi
        sete    %al
        orb     %cl, %al
        ret

to lowering:
        decq    %rsi
        cmpq    %rdi, %rsi
        setae   %al
        ret


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185677 91177308-0d34-0410-b5e6-96231b3b80d8

2013-07-05 00:31:17 +00:00

CMakeLists.txt

Tidy up a bit. No functional change.

2013-04-05 21:20:12 +00:00

InstCombine.h

Reapply with r182909 with a fix to the calculation of the new indices for

2013-05-31 00:59:42 +00:00

InstCombineAddSub.cpp

In InstCombine{AddSub,MulDivRem} convert APFloat.isFiniteNonZero() && !APFloat.isDenormal => APFloat.isNormal.

2013-06-26 23:17:31 +00:00

InstCombineAndOrXor.cpp

InstCombine: (icmp eq B, 0) | (icmp ult A, B) -> (icmp ule A, B-1)