mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
a5cc38bcbd
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28679 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
715 B
Plaintext
34 lines
715 B
Plaintext
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
Fix Ordered/Unordered FP stuff
|
|
|
|
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
improve bytezap opertunities
|
|
ulong %foo(ulong %y) {
|
|
entry:
|
|
%tmp = and ulong %y, 65535
|
|
%tmp2 = shr ulong %tmp, ubyte 3
|
|
ret ulong %tmp2
|
|
}
|
|
|
|
|
|
compiles to a 3 instruction sequence without instcombine
|
|
zapnot $16,3,$0
|
|
srl $0,3,$0
|
|
ret $31,($26),1
|
|
|
|
After instcombine you get
|
|
ulong %foo(ulong %y) {
|
|
entry:
|
|
%tmp = shr ulong %y, ubyte 3 ; <ulong> [#uses=1]
|
|
%tmp2 = and ulong %tmp, 8191 ; <ulong> [#uses=1]
|
|
ret ulong %tmp2
|
|
}
|
|
|
|
which compiles to
|
|
lda $0,8191($31)
|
|
srl $16,3,$1
|
|
and $1,$0,$0
|
|
ret $31,($26),1
|
|
|