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backport: re PR tree-optimization/81162 (UBSAN switch triggers incorrect optimization in SLSR) 

[gcc]

2016-07-25  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	Backport from mainline
	2016-07-14  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/81162
	* gimple-ssa-strength-reduction.c (replace_mult_candidate): Don't
	replace a negate with an add.

[gcc/testsuite]

2016-07-25  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	Backport from mainline
	2016-07-14  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/81162
	* gcc.dg/ubsan/pr81162.c: New file.

From-SVN: r250542
This commit is contained in:
Bill Schmidt 2017-07-25 19:40:50 +00:00 committed by William Schmidt
parent 371868a847
commit db1f03b6f7
4 changed files with 37 additions and 2 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2016-07-25 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Backport from mainline
2016-07-14 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/81162
* gimple-ssa-strength-reduction.c (replace_mult_candidate): Don't
replace a negate with an add.
2017-07-25 Georg-Johann Lay <avr@gjlay.de>
Backport from 2017-07-12 trunk r250151.

5
gcc/gimple-ssa-strength-reduction.c
View File

@ -2051,13 +2051,14 @@ replace_mult_candidate (slsr_cand_t c, tree basis_name, widest_int bump)
types but allows for safe negation without twisted logic. */
if (wi::fits_shwi_p (bump)
&& bump.to_shwi () != HOST_WIDE_INT_MIN
/* It is not useful to replace casts, copies, or adds of
/* It is not useful to replace casts, copies, negates, or adds of
an SSA name and a constant. */
&& cand_code != SSA_NAME
&& !CONVERT_EXPR_CODE_P (cand_code)
&& cand_code != PLUS_EXPR
&& cand_code != POINTER_PLUS_EXPR
&& cand_code != MINUS_EXPR)
&& cand_code != MINUS_EXPR
&& cand_code != NEGATE_EXPR)
{
enum tree_code code = PLUS_EXPR;
tree bump_tree;

8
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,11 @@
2016-07-25 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Backport from mainline
2016-07-14 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/81162
* gcc.dg/ubsan/pr81162.c: New file.
2017-07-25 Wilco Dijkstra <wdijkstr@arm.com>
PR target/79041

17
gcc/testsuite/gcc.dg/ubsan/pr81162.c Normal file
View File

@ -0,0 +1,17 @@
/* PR tree-optimization/81162 */
/* { dg-do run } */
/* { dg-options "-fsanitize=undefined -O2" } */
short s;
int i1 = 1;
int i2 = 1;
unsigned char uc = 147;
int main() {
s = (-uc + 2147483647) << 0;
if (9031239389974324562ULL >= (-((i1 && i2) + uc) ^ -21096) ) {
return 0;
} else {
return -1;
}
}