* [COMMITTED] [prange] Drop range to VARYING if the bitmask intersection made it so [PR115131]
@ 2024-05-17 14:03 Aldy Hernandez
2024-05-27 17:15 ` Mikael Morin
0 siblings, 1 reply; 2+ messages in thread
From: Aldy Hernandez @ 2024-05-17 14:03 UTC (permalink / raw)
To: GCC patches; +Cc: Andrew MacLeod, Aldy Hernandez
If the intersection of the bitmasks made the range span the entire
domain, normalize the range to VARYING.
gcc/ChangeLog:
PR middle-end/115131
* value-range.cc (prange::intersect): Set VARYING if intersection
of bitmasks made the range span the entire domain.
(range_tests_misc): New test.
---
gcc/value-range.cc | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/gcc/value-range.cc b/gcc/value-range.cc
index 334ffb70fbc..b38d6159a85 100644
--- a/gcc/value-range.cc
+++ b/gcc/value-range.cc
@@ -589,6 +589,11 @@ prange::intersect (const vrange &v)
irange_bitmask new_bitmask = get_bitmask_from_range (m_type, m_min, m_max);
m_bitmask.intersect (new_bitmask);
m_bitmask.intersect (r.m_bitmask);
+ if (varying_compatible_p ())
+ {
+ set_varying (type ());
+ return true;
+ }
if (flag_checking)
verify_range ();
@@ -2889,6 +2894,22 @@ range_tests_misc ()
p0.invert ();
ASSERT_TRUE (p0 == p1);
+ // The intersection of:
+ // [0, +INF] MASK 0xff..00 VALUE 0xf8
+ // [0, +INF] MASK 0xff..00 VALUE 0x00
+ // is [0, +INF] MASK 0xff..ff VALUE 0x00, which is VARYING.
+ // Test that we normalized to VARYING.
+ unsigned prec = TYPE_PRECISION (voidp);
+ p0.set_varying (voidp);
+ wide_int mask = wi::mask (8, true, prec);
+ wide_int value = wi::uhwi (0xf8, prec);
+ irange_bitmask bm (wi::uhwi (0xf8, prec), mask);
+ p0.update_bitmask (bm);
+ p1.set_varying (voidp);
+ bm = irange_bitmask (wi::zero (prec), mask);
+ p1.update_bitmask (bm);
+ p0.intersect (p1);
+
// [10,20] U [15, 30] => [10, 30].
r0 = range_int (10, 20);
r1 = range_int (15, 30);
--
2.45.0
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [COMMITTED] [prange] Drop range to VARYING if the bitmask intersection made it so [PR115131]
2024-05-17 14:03 [COMMITTED] [prange] Drop range to VARYING if the bitmask intersection made it so [PR115131] Aldy Hernandez
@ 2024-05-27 17:15 ` Mikael Morin
0 siblings, 0 replies; 2+ messages in thread
From: Mikael Morin @ 2024-05-27 17:15 UTC (permalink / raw)
To: Aldy Hernandez, GCC patches; +Cc: Andrew MacLeod
Hello,
Le 17/05/2024 à 16:03, Aldy Hernandez a écrit :
> If the intersection of the bitmasks made the range span the entire
> domain, normalize the range to VARYING.
>
> gcc/ChangeLog:
>
> PR middle-end/115131
> * value-range.cc (prange::intersect): Set VARYING if intersection
> of bitmasks made the range span the entire domain.
> (range_tests_misc): New test.
> ---
> gcc/value-range.cc | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/gcc/value-range.cc b/gcc/value-range.cc
> index 334ffb70fbc..b38d6159a85 100644
> --- a/gcc/value-range.cc
> +++ b/gcc/value-range.cc
> @@ -589,6 +589,11 @@ prange::intersect (const vrange &v)
> irange_bitmask new_bitmask = get_bitmask_from_range (m_type, m_min, m_max);
> m_bitmask.intersect (new_bitmask);
> m_bitmask.intersect (r.m_bitmask);
> + if (varying_compatible_p ())
> + {
> + set_varying (type ());
> + return true;
> + }
>
> if (flag_checking)
> verify_range ();
> @@ -2889,6 +2894,22 @@ range_tests_misc ()
> p0.invert ();
> ASSERT_TRUE (p0 == p1);
>
> + // The intersection of:
> + // [0, +INF] MASK 0xff..00 VALUE 0xf8
> + // [0, +INF] MASK 0xff..00 VALUE 0x00
> + // is [0, +INF] MASK 0xff..ff VALUE 0x00, which is VARYING.
> + // Test that we normalized to VARYING.
> + unsigned prec = TYPE_PRECISION (voidp);
> + p0.set_varying (voidp);
> + wide_int mask = wi::mask (8, true, prec);
> + wide_int value = wi::uhwi (0xf8, prec);
> + irange_bitmask bm (wi::uhwi (0xf8, prec), mask);
> + p0.update_bitmask (bm);
> + p1.set_varying (voidp);
> + bm = irange_bitmask (wi::zero (prec), mask);
> + p1.update_bitmask (bm);
> + p0.intersect (p1);
Isn't a check missing here,
ASSERT_TRUE (p0.varying_p ())
or something?
> +
> // [10,20] U [15, 30] => [10, 30].
> r0 = range_int (10, 20);
> r1 = range_int (15, 30);
^ permalink raw reply [flat|nested] 2+ messages in thread
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