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* [gcc(refs/users/aoliva/heads/testme)] Optimize nonstandard boolean validity checking
@ 2022-05-06 7:18 Alexandre Oliva
0 siblings, 0 replies; 2+ messages in thread
From: Alexandre Oliva @ 2022-05-06 7:18 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:4b916d8437e76146b1bdb20391b016e8461e8382
commit 4b916d8437e76146b1bdb20391b016e8461e8382
Author: Alexandre Oliva <oliva@adacore.com>
Date: Thu Feb 17 03:12:04 2022 -0300
Optimize nonstandard boolean validity checking
Validity checking of enumerations with nonstandard representation
starts by checking the value range, then calling _rep_to_pos to verify
that the value itself is valid. The value range check is thus
redundant and inefficient: the _rep_to_pos call is normally inlined
when optimizing for speed and the range check slows down the fast
path; it is unnecesary and undesirable when optimizing for size, and
just unnecessary when not optimizing. This patch thus drops the range
check for nonstandard boolean types.
[changelog]
* exp_attr.adb (Expand_N_Attribute_Reference) <Attribute_Valid>: Drop
redundant range check for nonstandard booleans.
Diff:
---
gcc/ada/exp_attr.adb | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/gcc/ada/exp_attr.adb b/gcc/ada/exp_attr.adb
index 5374dd4d7e9..c31d7e06d45 100644
--- a/gcc/ada/exp_attr.adb
+++ b/gcc/ada/exp_attr.adb
@@ -7254,7 +7254,11 @@ package body Exp_Attr is
New_Occurrence_Of (Standard_False, Loc))),
Right_Opnd => Make_Integer_Literal (Loc, 0));
- if Ptyp /= PBtyp
+ -- Skip the range test for boolean types, as it buys us
+ -- nothing. The function called above already fails for
+ -- values different from both True and False.
+
+ if Ptyp /= PBtyp and then not Is_Boolean_Type (PBtyp)
and then
(Type_Low_Bound (Ptyp) /= Type_Low_Bound (PBtyp)
or else
^ permalink raw reply [flat|nested] 2+ messages in thread
* [gcc(refs/users/aoliva/heads/testme)] Optimize nonstandard boolean validity checking
@ 2022-01-27 9:49 Alexandre Oliva
0 siblings, 0 replies; 2+ messages in thread
From: Alexandre Oliva @ 2022-01-27 9:49 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:5f92aa1218d2171e4f479eafc95414561f7f4417
commit 5f92aa1218d2171e4f479eafc95414561f7f4417
Author: Alexandre Oliva <oliva@adacore.com>
Date: Wed Dec 29 08:44:57 2021 -0300
Optimize nonstandard boolean validity checking
Validity checking of enumerations with nonstandard representation
starts by checking the value range, then calling _rep_to_pos to verify
that the value itself is valid. The value range check is thus
redundant and inefficient: the _rep_to_pos call is normally inlined
when optimizing for speed and the range check slows down the fast
path; it is unnecesary and undesirable when optimizing for size, and
just unnecessary when not optimizing. This patch thus drops the range
check for nonstandard boolean types.
[changelog]
* exp_attr.adb (Expand_N_Attribute_Reference) <Attribute_Valid>: Drop
redundant range check for nonstandard booleans.
Diff:
---
gcc/ada/exp_attr.adb | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/gcc/ada/exp_attr.adb b/gcc/ada/exp_attr.adb
index 5374dd4d7e9..c31d7e06d45 100644
--- a/gcc/ada/exp_attr.adb
+++ b/gcc/ada/exp_attr.adb
@@ -7254,7 +7254,11 @@ package body Exp_Attr is
New_Occurrence_Of (Standard_False, Loc))),
Right_Opnd => Make_Integer_Literal (Loc, 0));
- if Ptyp /= PBtyp
+ -- Skip the range test for boolean types, as it buys us
+ -- nothing. The function called above already fails for
+ -- values different from both True and False.
+
+ if Ptyp /= PBtyp and then not Is_Boolean_Type (PBtyp)
and then
(Type_Low_Bound (Ptyp) /= Type_Low_Bound (PBtyp)
or else
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-01-27 9:49 Alexandre Oliva
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