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* [gcc r12-2517] Adjust ranges for to_upper and to_lower.
@ 2021-07-26 18:20 Andrew Macleod
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From: Andrew Macleod @ 2021-07-26 18:20 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1ce0b26e6e1e6c348b1d54f1f462a44df6fe47f5
commit r12-2517-g1ce0b26e6e1e6c348b1d54f1f462a44df6fe47f5
Author: Andrew MacLeod <amacleod@redhat.com>
Date: Mon Jul 26 09:40:32 2021 -0400
Adjust ranges for to_upper and to_lower.
Exclude lower case chars from to_upper and upper case chars from to_lower.
gcc/
PR tree-optimization/78888
* gimple-range-fold.cc (fold_using_range::range_of_builtin_call): Add cases
for CFN_BUILT_IN_TOUPPER and CFN_BUILT_IN_TOLOWER.
gcc/testsuite/
* gcc.dg/pr78888.c: New.
Diff:
---
gcc/gimple-range-fold.cc | 32 ++++++++++++++++++++++++++++++++
gcc/testsuite/gcc.dg/pr78888.c | 29 +++++++++++++++++++++++++++++
2 files changed, 61 insertions(+)
diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc
index f95af3d5866..8465b4a82f6 100644
--- a/gcc/gimple-range-fold.cc
+++ b/gcc/gimple-range-fold.cc
@@ -868,6 +868,38 @@ fold_using_range::range_of_builtin_call (irange &r, gcall *call,
}
break;
+ case CFN_BUILT_IN_TOUPPER:
+ {
+ arg = gimple_call_arg (call, 0);
+ if (!src.get_operand (r, arg))
+ return false;
+ // Return the range passed in without any lower case characters,
+ // but including all the upper case ones.
+ int_range<2> exclude (build_int_cst (type, 'a'),
+ build_int_cst (type, 'z'), VR_ANTI_RANGE);
+ r.intersect (exclude);
+ int_range<2> uppers (build_int_cst (type, 'A'),
+ build_int_cst (type, 'Z'));
+ r.union_ (uppers);
+ return true;
+ }
+
+ case CFN_BUILT_IN_TOLOWER:
+ {
+ arg = gimple_call_arg (call, 0);
+ if (!src.get_operand (r, arg))
+ return false;
+ // Return the range passed in without any upper case characters,
+ // but including all the lower case ones.
+ int_range<2> exclude (build_int_cst (type, 'A'),
+ build_int_cst (type, 'Z'), VR_ANTI_RANGE);
+ r.intersect (exclude);
+ int_range<2> lowers (build_int_cst (type, 'a'),
+ build_int_cst (type, 'z'));
+ r.union_ (lowers);
+ return true;
+ }
+
CASE_CFN_FFS:
CASE_CFN_POPCOUNT:
// __builtin_ffs* and __builtin_popcount* return [0, prec].
diff --git a/gcc/testsuite/gcc.dg/pr78888.c b/gcc/testsuite/gcc.dg/pr78888.c
new file mode 100644
index 00000000000..77a130cf11c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr78888.c
@@ -0,0 +1,29 @@
+/* PR tree-optimization/78888 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-evrp" } */
+
+void kill (void);
+void keep (void);
+
+void g (int x)
+{
+ if (__builtin_toupper ((unsigned char)x) == 'a')
+ kill ();
+ if (__builtin_toupper ((unsigned char)x) == 'z')
+ kill ();
+ if (__builtin_tolower ((unsigned char)x) == 'A')
+ kill ();
+ if (__builtin_tolower ((unsigned char)x) == 'Z')
+ kill ();
+
+ if (__builtin_toupper ((unsigned char)x) == 'A')
+ keep ();
+ if (__builtin_toupper ((unsigned char)x) == 'Z')
+ keep ();
+ if (__builtin_tolower ((unsigned char)x) == 'a')
+ keep ();
+ if (__builtin_tolower ((unsigned char)x) == 'z')
+ keep ();
+}
+/* { dg-final { scan-tree-dump-not "kill" "evrp" } } */
+/* { dg-final { scan-tree-dump-times "keep" 4 "evrp"} } */
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