llvm-6502/test/Transforms/InstCombine/and.ll
Chris Lattner 8408add00a Add optimizations:
- (A & C1)+(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0
 - (A & C1)^(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5741 91177308-0d34-0410-b5e6-96231b3b80d8
2003-03-10 23:52:54 +00:00

53 lines
839 B
LLVM

; This test makes sure that these instructions are properly eliminated.
;
; RUN: if as < %s | opt -instcombine | dis | grep and
; RUN: then exit 1
; RUN: else exit 0
; RUN: fi
implementation
int %test1(int %A) {
%B = and int %A, 0 ; zero result
ret int %B
}
int %test2(int %A) {
%B = and int %A, -1 ; noop
ret int %B
}
bool %test3(bool %A) {
%B = and bool %A, false ; always = false
ret bool %B
}
bool %test4(bool %A) {
%B = and bool %A, true ; noop
ret bool %B
}
int %test5(int %A) {
%B = and int %A, %A
ret int %B
}
bool %test6(bool %A) {
%B = and bool %A, %A
ret bool %B
}
int %test7(int %A) { ; A & ~A == 0
%NotA = xor int %A, -1
%B = and int %A, %NotA
ret int %B
}
ubyte %test8(ubyte %A) { ; AND associates
%B = and ubyte %A, 3
%C = and ubyte %B, 4
ret ubyte %C
}