llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-19 04:32:19 +00:00

History

Manman Ren ed57984483 X86: optimization for -(x != 0)

This patch will optimize -(x != 0) on X86
FROM 
cmpl	$0x01,%edi
sbbl	%eax,%eax
notl	%eax
TO
negl %edi
sbbl %eax %eax

In order to generate negl, I added patterns in Target/X86/X86InstrCompiler.td:
def : Pat<(X86sub_flag 0, GR32:$src), (NEG32r GR32:$src)>;

rdar: 10961709


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156312 91177308-0d34-0410-b5e6-96231b3b80d8

2012-05-07 18:06:23 +00:00

ARM

Teach DAGCombine the same multiply-by-1.0 folding trick when doing FMAs, just like it now knows for FMULs.

2012-05-02 22:17:40 +00:00

CellSPU

Flip the new block-placement pass to be on by default.

2012-04-16 13:49:17 +00:00

CPP

…

Generic

Move to X86 directory because this fails on non-X86 platforms.

2012-04-16 16:38:48 +00:00