https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93130
Bug ID: 93130
Summary: PCC simple memset not inlined
Product: gcc
Version: 8.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: jens.seifert at de dot ibm.com
Target Milestone: ---
Input:
void memspace16(char *p)
{
memset(p, ' ', 16);
}
Expected result:
li 4,0x2020
rldimi 4,4,16,0
rldimi 4,4,32,0
std 4,0(3)
Splatting the memset input to 64-bit can be done using li + 2xrldimi.
But also
._Z13memspace16OptPc:
LFB..3:
lis 9,0x2020
ori 9,9,0x2020
sldi 9,9,32
oris 9,9,0x2020
ori 9,9,0x2020
std 9,0(3)
std 9,8(3)
blr
would perform better than the function call to memset.
