http://llvm.org/bugs/show_bug.cgi?id=21126
Bug ID: 21126
Summary: missed optimization: recognize square root squared
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
It seems silly, but this actually happens in the real world...for example, in
code that does x ** 3/2 like:
http://benchmarksgame.alioth.debian.org/u32/program.php?test=nbody&lang=gcc&id=1
This should just return 'f':
$ cat sqrt_squared.ll
define double @foo(double %f) #0 {
%sqrt = tail call double @llvm.sqrt.f64(double %f)
%mul = fmul fast double %sqrt, %sqrt
ret double %mul
}
; Function Attrs: nounwind readnone
declare double @llvm.sqrt.f64(double) #1
attributes #0 = { "unsafe-fp-math"="true" }
attributes #1 = { nounwind readnone
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