https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89310
Bug ID: 89310
Summary: Poor code generation returning float field from a
struct
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: bergner at gcc dot gnu.org
Target Milestone: ---
The following test case shows poor code generation on powerpc64le-linux:
bergner@pike:~/gcc/BUGS/PR88845$ cat struct.i
struct s {
int i;
float f;
};
float
foo (struct s arg)
{
return arg.f;
}
bergner@pike:~/gcc/BUGS/PR88845$ gcc -O2 -S struct.i
bergner@pike:~/gcc/BUGS/PR88845$ cat struct.s
foo:
srdi 3,3,32
sldi 9,3,32
mtvsrd 1,9
xscvspdpn 1,1
blr
The srdi followed by a sldi could be replaced with a simple: rldicr 9,3,0,31
