llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-28 06:32:09 +00:00

History

Arnold Schwaighofer 08a0e8f8db LoopVectorizer: integer division is not a reduction operation

Don't classify idiv/udiv as a reduction operation. Integer division is lossy.
For example : (1 / 2) * 4 != 4/2.

Example:

int a[] = { 2, 5, 2, 2}
int x = 80;

for()
  x /= a[i];

Scalar:
  x /= 2 // = 40
  x /= 5 // = 8
  x /= 2 // = 4
  x /= 2 // = 2

Vectorized:

 <80, 1> / <2,5> //= <40,0>
 <40, 0> / <2,2> //= <20,0>

 20*0 = 0

radar://13640654

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179381 91177308-0d34-0410-b5e6-96231b3b80d8

2013-04-12 15:15:19 +00:00

Hello

Move all of the header files which are involved in modelling the LLVM IR

2013-01-02 11:36:10 +00:00

InstCombine

Optimize icmp involving addition better

2013-04-11 20:05:46 +00:00

Instrumentation

[ASan] Allow disabling init-order checks for globals by source file name.

2013-04-11 13:20:00 +00:00

IPO

Use a worklist to avoid a sneaky iterator invalidation.