https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111285
Bug ID: 111285
Summary: vector ABSU is lowered incorrectly
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Blocks: 110009
Target Milestone: ---
Take:
```
#define vector __attribute__((vector_size(1*sizeof(int))))
void unsigned_f1 (vector int *vp, vector unsigned *x)
{
vector int v = *vp;
vector unsigned int d_6;
vector int b_5;
vector unsigned int v1_2;
vector unsigned int _7;
vector int _9;
b_5 = v>>(sizeof(int)*8 - 1);
_9 = b_5 | 1;
d_6 = (vector unsigned int) _9;
v1_2 = (vector unsigned int) v;
_7 = v1_2 * d_6;
*x = _7;
}
```
and this match.pd pattern:
```
/* x * ((x>>N)|1) -> abs(x) */
(simplify
(mult:c @0 (nop_convert? (bit_ior:c (rshift @1 INTEGER_CST@2) integer_onep)))
(if (!TYPE_UNSIGNED (TREE_TYPE (@1))
&& wi::to_wide (@2) == element_precision (type) - 1
&& bitwise_equal_p (@0, @1))
(if (TYPE_UNSIGNED (type))
(absu @1)
(abs @1))))
```
With this we get right before vector lowering:
```
v_3 = *vp_2(D);
_7_4 = ABSU_EXPR <v_3>;
# .MEM_6 = VDEF <.MEM_1(D)>
*x_5(D) = _7_4;
```
Which is correct.
But then lowering comes along and gives:
```
v_3 = *vp_2(D);
_7 = VIEW_CONVERT_EXPR<unsigned intD.9>(v_3);
_7_4 = {_7};
# .MEM_6 = VDEF <.MEM_1(D)>
*x_5(D) = _7_4;
```
This is because we used the lhs type rather than the rhs type ...
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110009
[Bug 110009] Another missing ABS detection
