mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-20 11:29:24 +00:00
6261d766f9
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26133 91177308-0d34-0410-b5e6-96231b3b80d8
27 lines
903 B
LLVM
27 lines
903 B
LLVM
; This file contains various testcases that require tracking whether bits are
|
|
; set or cleared by various instructions.
|
|
; RUN: llvm-as < %s | opt -instcombine -instcombine -disable-output &&
|
|
; RUN: llvm-as < %s | opt -instcombine -instcombine | llvm-dis | not grep %ELIM
|
|
|
|
; Reduce down to a single XOR
|
|
int %test3(int %B) {
|
|
%ELIMinc = and int %B, 1
|
|
%tmp.5 = xor int %ELIMinc, 1
|
|
%ELIM7 = and int %B, -2
|
|
%tmp.8 = or int %tmp.5, %ELIM7
|
|
ret int %tmp.8
|
|
}
|
|
|
|
; Finally, a bigger case where we chain things together. This corresponds to
|
|
; incrementing a single-bit bitfield, which should become just an xor.
|
|
int %test4(int %B) {
|
|
%ELIM3 = shl int %B, ubyte 31
|
|
%ELIM4 = shr int %ELIM3, ubyte 31
|
|
%inc = add int %ELIM4, 1
|
|
%ELIM5 = and int %inc, 1
|
|
%ELIM7 = and int %B, -2
|
|
%tmp.8 = or int %ELIM5, %ELIM7
|
|
ret int %tmp.8
|
|
}
|
|
|