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2013 Aug 20
0
[LLVMdev] Duplicate loading of double constants
On 18 August 2013 22:38, Eugene Toder <eltoder at gmail.com> wrote:
> Hi,
>
> I found that in some cases llvm generates duplicate loads of double
> constants,
> e.g.
>
> $ cat t.c
> double f(double* p, int n)
> {
> double s = 0;
> if (n)
> s += *p;
> return s;
> }
> $ clang -S -O3 t.c -o -
> ...
> f:
2013 Aug 19
2
[LLVMdev] Duplicate loading of double constants
Hi,
I found that in some cases llvm generates duplicate loads of double
constants,
e.g.
$ cat t.c
double f(double* p, int n)
{
double s = 0;
if (n)
s += *p;
return s;
}
$ clang -S -O3 t.c -o -
...
f: # @f
.cfi_startproc
# BB#0:
xorps %xmm0, %xmm0
testl %esi, %esi
je .LBB0_2
# BB#1:
xorps