https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118541
Bug ID: 118541
Summary: Incorrect transformation to xscmpgtdp for Unordered
Operations
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: jeevitha at gcc dot gnu.org
Target Milestone: ---
Target: powerpc-*-linux-gnu
Gcc trunk generates xscmpgtdp for Unordered Operations. This issue was from
power9/power10 with O2
jeevitha@ltcd97-lp3:~$ cat bug.c
extern double __ieee754_acos (double);
double
__acospi (double x)
{
double ret = __ieee754_acos (x) / 3.14;
return __builtin_isgreater(ret, 1.0) ? 1.0 : ret;
}
jeevitha@ltcd97-lp3:~$ gcc bug.c -O2 -mcpu=power9 -S -o bug.s
jeevitha@ltcd97-lp3:~$ cat bug.s
.file "bug.c"
.machine power9
.machine altivec
.abiversion 2
.section ".text"
.align 2
.p2align 4,,15
.globl __acospi
.type __acospi, @function
__acospi:
.LFB0:
.cfi_startproc
.LCF0:
0: addis 2,12,.TOC.-.LCF0@ha
addi 2,2,.TOC.-.LCF0@l
.localentry __acospi,.-__acospi
mflr 0
std 0,16(1)
stdu 1,-32(1)
.cfi_def_cfa_offset 32
.cfi_offset 65, 16
bl __ieee754_acos
nop
addis 9,2,.LC2@toc@ha
addi 1,1,32
.cfi_def_cfa_offset 0
lfd 0,.LC2@toc@l(9)
addis 9,2,.LC0@toc@ha
ld 0,16(1)
lfd 12,.LC0@toc@l(9)
fdiv 0,1,0
mtlr 0
.cfi_restore 65
xscmpgtdp 1,0,12
xxsel 1,0,12,1
blr
