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re PR tree-optimization/64130 (vrp: handle non zero constant divided by range cannot be zero.) 

gcc/ChangeLog:

2015-06-29  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/64130
	* tree-vrp.c (extract_range_from_binary_expr_1): For unsigned
	division, compute max and min when value ranges for dividend and
	divisor are available.


gcc/testsuite/ChangeLog:

2015-06-29  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/64130
	* gcc.dg/tree-ssa/pr64130.c: New test.

From-SVN: r225108
This commit is contained in:
Kugan Vivekanandarajah 2015-06-29 00:15:41 +00:00 committed by Kugan Vivekanandarajah
parent 1d1fe91a75
commit c44b2a4fb3
4 changed files with 51 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2015-06-29 Kugan Vivekanandarajah <kuganv@linaro.org>
PR middle-end/64130
* tree-vrp.c (extract_range_from_binary_expr_1): For unsigned
division, compute max and min when value ranges for dividend and
divisor are available.
2015-06-28 Chung-Lin Tang <cltang@codesourcery.com>
Sandra Loosemore <sandra@codesourcery.com>

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2015-06-29 Kugan Vivekanandarajah <kuganv@linaro.org>
PR middle-end/64130
* gcc.dg/tree-ssa/pr64130.c: New test.
2015-06-26 Jiong Wang <jiong.wang@arm.com>
* gcc.target/aarch64/pic-small.c: New testcase.

18
gcc/testsuite/gcc.dg/tree-ssa/pr64130.c Normal file
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@ -0,0 +1,18 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-vrp1" } */
int funsigned (unsigned a)
{
return 0x1ffffffffL / a == 0;
}
int funsigned2 (unsigned a)
{
if (a < 1) return 1;
return (-1 * 0x1ffffffffL) / a == 0;
}
/* { dg-final { scan-tree-dump ": \\\[2, 8589934591\\\]" "vrp1" } } */
/* { dg-final { scan-tree-dump ": \\\[-8589934591, -2\\\]" "vrp1" } } */

23
gcc/tree-vrp.c
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@ -3133,14 +3133,33 @@ extract_range_from_binary_expr_1 (value_range_t *vr,
and all numbers from min to 0 for negative min. */
cmp = compare_values (vr0.max, zero);
if (cmp == -1)
max = zero;
{
/* When vr0.max < 0, vr1.min != 0 and value
ranges for dividend and divisor are available. */
if (vr1.type == VR_RANGE
&& !symbolic_range_p (&vr0)
&& !symbolic_range_p (&vr1)
&& !compare_values (vr1.min, zero))
max = int_const_binop (code, vr0.max, vr1.min);
else
max = zero;
}
else if (cmp == 0 || cmp == 1)
max = vr0.max;
else
type = VR_VARYING;
cmp = compare_values (vr0.min, zero);
if (cmp == 1)
min = zero;
{
/* For unsigned division when value ranges for dividend
and divisor are available. */
if (vr1.type == VR_RANGE
&& !symbolic_range_p (&vr0)
&& !symbolic_range_p (&vr1))
min = int_const_binop (code, vr0.min, vr1.max);
else
min = zero;
}
else if (cmp == 0 || cmp == -1)
min = vr0.min;
else