[Bug target/67290] New: powerpc: suboptimal add of u64 with u32
christophe.leroy@c-s.fr
gcc-bugzilla@gcc.gnu.org
Thu Aug 20 11:28:00 GMT 2015
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67290
Bug ID: 67290
Summary: powerpc: suboptimal add of u64 with u32
Product: gcc
Version: 4.9.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: christophe.leroy@c-s.fr
Target Milestone: ---
#define u32 unsigned long
#define u64 unsigned long long
u64 target(u64 base, u32 offset)
{
return base + offset;
}
With GCC 4.9.3 we get: (same with GCC 4.8.3)
00000000 <target>:
0: 7c ab 2b 78 mr r11,r5
4: 39 40 00 00 li r10,0
8: 7c 84 58 14 addc r4,r4,r11
c: 7c 63 51 14 adde r3,r3,r10
10: 4e 80 00 20 blr
I would expect:
<target>:
addc r4,r4,r5
addze r3,r3
blr
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