Displaying 1 result from an estimated 1 matches for "unm9h7".
2017 Jul 01
8
[IR canonicalization] 6 ways to choose {-1,0,1}
...%7
}
6. Zexts and sub
int neg101_cmp_sub(int x, int y) {
return (x>y) - (x<y);
}
define i32 @neg101_cmp_sub(i32, i32) {
%3 = icmp sgt i32 %0, %1
%4 = zext i1 %3 to i32
%5 = icmp slt i32 %0, %1
%6 = zext i1 %5 to i32
%7 = sub nsw i32 %4, %6
ret i32 %7
}
https://godbolt.org/g/UnM9H7
Show these are logically equivalent:
http://rise4fun.com/Alive/b4D
Recent patch related to this pattern:
https://reviews.llvm.org/D34278
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