https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118184
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Before the patch:
- is with vectorization.
+ is without.
With vectorization:
u.d = Nan;
_8 = mant_21 >> 32;
_3 = {mant_21, _8};
vect__10.4_4 = (vector(2) unsigned int) _3;
MEM <vector(2) unsigned int> [(union ieee854_long_double *)&u] =
vect__10.4_4;
retval_26 = u.d;
Without:
<bb 11> [local count: 11693048]:
u.d = Nan;
MEM <unsigned long> [(union ieee854_long_double *)&u] = mant_21;
retval_26 = u.d;
u ={v} {CLOBBER(eos)};
Both look correct. Though with vectorization is worse.
- is with vectorization while + is without
- fmov d31, x0
- fmov d30, x0
- mov x2, 0
- mov x3, 9223231299366420480
- ushr d31, d31, 32
- stp x2, x3, [sp, 16]
- uzp1 v31.2d, v30.2d, v31.2d
- xtn v31.2s, v31.2d
- str d31, [sp, 16]
- ldr q0, [sp, 16]
+ fmov d0, x0
+ stp x20, x21, [sp, 16]
+ .cfi_offset 21, -72
+ .cfi_offset 20, -80
+ fmov v0.d[1], x21
+ ldp x20, x21, [sp, 16]
+ .cfi_restore 21
+ .cfi_restore 20
x21 is uninitialized which is wrong.
