[Bug target/104930] New: built-in function requires "-flax-vector-conversions" to get better warning
linkw at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Tue Mar 15 09:50:07 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104930
Bug ID: 104930
Summary: built-in function requires "-flax-vector-conversions"
to get better warning
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: linkw at gcc dot gnu.org
Target Milestone: ---
----- Test case -----
$cat new_test.c
typedef vector unsigned int v4u;
extern v4u vg;
v4u testXXPERMDI(void) { return __builtin_vsx_xxpermdi(vg, vg); }
----- Option -----
-mcpu=power9
===
GCC emits:
new_test.c: In function ‘testXXPERMDI’:
new_test.c:5:1: note: use ‘-flax-vector-conversions’ to permit conversions
between vectors with differing element types or numbers of subparts
5 | v4u testXXPERMDI(void) { return __builtin_vsx_xxpermdi(vg, vg); }
| ^~~
new_test.c:5:56: error: incompatible type for argument 1 of
‘__builtin_vsx_xxpermdi’
5 | v4u testXXPERMDI(void) { return __builtin_vsx_xxpermdi(vg, vg); }
| ^~
| |
| v4u {aka
__vector(4) unsigned int}
new_test.c:5:56: note: expected ‘__vector signed char’ {aka ‘__vector(16)
signed cha ’} but argument is of type ‘v4u’ {aka ‘__vector(4) unsigned int’}
new_test.c:5:60: error: incompatible type for argument 2 of
‘__builtin_vsx_xxpermdi’
5 | v4u testXXPERMDI(void) { return __builtin_vsx_xxpermdi(vg, vg); }
| ^~
| |
| v4u {aka
__vector(4) unsigned int}
new_test.c:5:60: note: expected ‘__vector signed char’ {aka ‘__vector(16)
signed cha ’} but argument is of type ‘v4u’ {aka ‘__vector(4) unsigned int’}
new_test.c:5:33: error: too few arguments to function ‘__builtin_vsx_xxpermdi’
5 | v4u testXXPERMDI(void) { return __builtin_vsx_xxpermdi(vg, vg); }
| ^~~~~~~~~~~~~~~~~~~~~~
But with r12-5751-gc9dd01314d8467, it only has:
new_test.c: In function ‘testXXPERMDI’:
new_test.c:5:33: error: too few arguments to function ‘__builtin_vsx_xxpermdi’
5 | v4u testXXPERMDI(void) { return __builtin_vsx_xxpermdi(vg, vg); }
| ^~~~~~~~~~~~~~~~~~~~~~
More information about the Gcc-bugs
mailing list