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Fix PR47707 

From-SVN: r170062
This commit is contained in:
Xinliang David Li 2011-02-12 00:12:52 +00:00 committed by Xinliang David Li
parent 1da7d8c0d3
commit 1bbc6693c9
4 changed files with 44 additions and 3 deletions
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5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2011-02-11 Xinliang David Li <davidxl@google.com>
PR tree-optimization/47707
* tree-chrec.c (convert_affine_scev): Keep type precision.
2011-02-11 Eric Botcazou <ebotcazou@adacore.com>
PR tree-optimization/47420

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2011-02-11 Xinliang David Li <davidxl@google.com>
PR tree-optimization/47707
* g++.dg/tree-ssa/pr47707.C: New test.
2011-02-11 Eric Botcazou <ebotcazou@adacore.com>
* g++.dg/opt/inline17.C: New test.

29
gcc/testsuite/g++.dg/tree-ssa/pr47707.C Normal file
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@ -0,0 +1,29 @@
/* { dg-do run } */
/* { dg-options "-O2 -fno-tree-vrp" } */
#include <assert.h>
struct CH
{
unsigned char ch : 3;
} ch;
__attribute__((noinline)) void MakeCheckOp (unsigned int *v1, unsigned int *v2)
{
assert (*v1 == *v2);
}
int main (void)
{
int len;
for (len = 4; len >= 1; len--)
{
unsigned v1, v2;
ch.ch = len;
v1 = ch.ch;
v2 = len;
MakeCheckOp (&v1, &v2);
}
}

8
gcc/tree-chrec.c
View File

@ -1238,8 +1238,11 @@ convert_affine_scev (struct loop *loop, tree type,
performed by default when CT is signed. */
new_step = *step;
if (TYPE_PRECISION (step_type) > TYPE_PRECISION (ct) && TYPE_UNSIGNED (ct))
new_step = chrec_convert_1 (signed_type_for (ct), new_step, at_stmt,
use_overflow_semantics);
{
tree signed_ct = build_nonstandard_integer_type (TYPE_PRECISION (ct), 0);
new_step = chrec_convert_1 (signed_ct, new_step, at_stmt,
use_overflow_semantics);
}
new_step = chrec_convert_1 (step_type, new_step, at_stmt, use_overflow_semantics);
if (automatically_generated_chrec_p (new_base)
@ -1579,4 +1582,3 @@ evolution_function_right_is_integer_cst (const_tree chrec)
return false;
}
}