https://bugs.llvm.org/show_bug.cgi?id=37313
Bug ID: 37313
Summary: Missed optimizations for comparison of doubles in
loops
Product: libraries
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: david.bolvan...@gmail.com
CC: llvm-bugs@lists.llvm.org
Hello,
double test(double *arr, int size) {
double m = INFINITY;
int flag = 1;
int i;
double a;
for (i=0; i<size;++i) {
a = arr[i];
if (a <= m ) {
m = a;
flag = 0;
}
++i;
}
if (flag) {
return 0.0;
}
return m;
}
ASM outputs:
https://godbolt.org/g/iSjSGW
Seems like Clang generates worse code because LLVM missed same patterns..
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