https://llvm.org/bugs/show_bug.cgi?id=24314
Bug ID: 24314
Summary: fmax/fmin calls are not optimized
Product: new-bugs
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
I don't know if this is a front-end bug, a middle-end bug, an x86 back-end bug,
or not a bug:
$ cat fmax.c
#include <math.h>
double max1(double x, double y) {
return fmax(x, y);
}
$ ./clang -v
clang version 3.8.0 (trunk 243489)
Target: x86_64-apple-darwin14.4.0
Thread model: posix
$ ./clang -O2 -fomit-frame-pointer -fno-math-errno fmax.c -S -o -
...
_max1: ## @max1
jmp _fmax ## TAILCALL
I thought that 'maxsd' would be used here given we're ignoring errno (which I
think is default for OSX, so I don't even need to explicitly use that flag).
Certainly with -ffast-math, we should be able to do this optimization?
GCC does:
$ gcc -O2 -fomit-frame-pointer -ffast-math fmax.c -S -o -
...
maxsd %xmm1, %xmm0
ret
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