https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114004
Bug ID: 114004
Summary: GCC emits a superfluous instruction for simple test
case on ppc
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: bergner at gcc dot gnu.org
Target Milestone: ---
We emit a superfluous rldicl insn for the following test case. The rlwinm is
all that is needed/required. This is not a regression.
bergner@ltcden2-lp1:PR112103$ cat bug.c
unsigned int
rot (unsigned int x)
{
return x & 0xbfffffff;
}
bergner@ltcden2-lp1:PR112103$ /opt/gcc-nightly/trunk/bin/gcc -S -O2 bug.c
bergner@ltcden2-lp1:PR112103$ cat bug.s
.file "bug.c"
.machine power10
.abiversion 2
.section ".text"
.align 2
.p2align 4,,15
.globl rot
.type rot, @function
rot:
.LFB0:
.cfi_startproc
.localentry rot,1
rlwinm 3,3,0,2,0
rldicl 3,3,0,32
blr
.long 0
.byte 0,0,0,0,0,0,0,0
.cfi_endproc
.LFE0:
.size rot,.-rot
.ident "GCC: (GNU) 14.0.1 20240219 (experimental) [remotes/origin/HEAD
r14-9074-gd70facd54a]"
.section .note.GNU-stack,"",@progbits
