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extend shift count warnings to vector types 

gcc/c/
2016-08-01  Jan Beulich  <jbeulich@suse.com>

	* c-fold.c (c_fully_fold_internal): Also emit shift count
	warnings for vector types.
	* c-typeck.c (build_binary_op): Likewise.

gcc/testsuite/
2016-08-01  Jan Beulich  <jbeulich@suse.com>

	* gcc.dg/vshift-6.c, gcc.dg/vshift-7.c: New.

From-SVN: r238936
This commit is contained in:
Jan Beulich 2016-08-01 09:39:52 +00:00 committed by Jan Beulich
parent 77c3c27ecc
commit 76e2c821a4
6 changed files with 148 additions and 27 deletions
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6
gcc/c/ChangeLog
View File

@ -1,3 +1,9 @@
2016-08-01 Jan Beulich <jbeulich@suse.com>
* c-fold.c (c_fully_fold_internal): Also emit shift count
warnings for vector types.
* c-typeck.c (build_binary_op): Likewise.
2016-07-29 Marek Polacek <polacek@redhat.com>
PR c/71742

18
gcc/c/c-fold.c
View File

@ -320,8 +320,6 @@ c_fully_fold_internal (tree expr, bool in_init, bool *maybe_const_operands,
if ((code == LSHIFT_EXPR || code == RSHIFT_EXPR)
&& TREE_CODE (orig_op1) != INTEGER_CST
&& TREE_CODE (op1) == INTEGER_CST
&& (TREE_CODE (TREE_TYPE (orig_op0)) == INTEGER_TYPE
|| TREE_CODE (TREE_TYPE (orig_op0)) == FIXED_POINT_TYPE)
&& TREE_CODE (TREE_TYPE (orig_op1)) == INTEGER_TYPE
&& c_inhibit_evaluation_warnings == 0)
{
@ -330,13 +328,23 @@ c_fully_fold_internal (tree expr, bool in_init, bool *maybe_const_operands,
(code == LSHIFT_EXPR
? G_("left shift count is negative")
: G_("right shift count is negative")));
else if (compare_tree_int (op1,
TYPE_PRECISION (TREE_TYPE (orig_op0)))
>= 0)
else if ((TREE_CODE (TREE_TYPE (orig_op0)) == INTEGER_TYPE
|| TREE_CODE (TREE_TYPE (orig_op0)) == FIXED_POINT_TYPE)
&& compare_tree_int (op1,
TYPE_PRECISION (TREE_TYPE (orig_op0)))
>= 0)
warning_at (loc, OPT_Wshift_count_overflow,
(code == LSHIFT_EXPR
? G_("left shift count >= width of type")
: G_("right shift count >= width of type")));
else if (TREE_CODE (TREE_TYPE (orig_op0)) == VECTOR_TYPE
&& compare_tree_int (op1,
TYPE_PRECISION (TREE_TYPE (TREE_TYPE (orig_op0))))
>= 0)
warning_at (loc, OPT_Wshift_count_overflow,
code == LSHIFT_EXPR
? G_("left shift count >= width of vector element")
: G_("right shift count >= width of vector element"));
}
if (code == LSHIFT_EXPR
/* If either OP0 has been folded to INTEGER_CST... */

58
gcc/c/c-typeck.c
View File

@ -10986,21 +10986,16 @@ build_binary_op (location_t location, enum tree_code code,
Also set SHORT_SHIFT if shifting rightward. */
case RSHIFT_EXPR:
if (code0 == VECTOR_TYPE && code1 == INTEGER_TYPE
&& TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE)
{
result_type = type0;
converted = 1;
}
else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE
&& TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE
&& TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE
&& TYPE_VECTOR_SUBPARTS (type0) == TYPE_VECTOR_SUBPARTS (type1))
if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE
&& TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE
&& TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE
&& TYPE_VECTOR_SUBPARTS (type0) == TYPE_VECTOR_SUBPARTS (type1))
{
result_type = type0;
converted = 1;
}
else if ((code0 == INTEGER_TYPE || code0 == FIXED_POINT_TYPE)
else if ((code0 == INTEGER_TYPE || code0 == FIXED_POINT_TYPE
|| code0 == VECTOR_TYPE)
&& code1 == INTEGER_TYPE)
{
doing_shift = true;
@ -11013,6 +11008,18 @@ build_binary_op (location_t location, enum tree_code code,
warning_at (location, OPT_Wshift_count_negative,
"right shift count is negative");
}
else if (code0 == VECTOR_TYPE)
{
if (compare_tree_int (op1,
TYPE_PRECISION (TREE_TYPE (type0)))
>= 0)
{
int_const = false;
if (c_inhibit_evaluation_warnings == 0)
warning_at (location, OPT_Wshift_count_overflow,
"right shift count >= width of vector element");
}
}
else
{
if (!integer_zerop (op1))
@ -11036,21 +11043,16 @@ build_binary_op (location_t location, enum tree_code code,
break;
case LSHIFT_EXPR:
if (code0 == VECTOR_TYPE && code1 == INTEGER_TYPE
&& TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE)
{
result_type = type0;
converted = 1;
}
else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE
&& TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE
&& TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE
&& TYPE_VECTOR_SUBPARTS (type0) == TYPE_VECTOR_SUBPARTS (type1))
if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE
&& TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE
&& TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE
&& TYPE_VECTOR_SUBPARTS (type0) == TYPE_VECTOR_SUBPARTS (type1))
{
result_type = type0;
converted = 1;
}
else if ((code0 == INTEGER_TYPE || code0 == FIXED_POINT_TYPE)
else if ((code0 == INTEGER_TYPE || code0 == FIXED_POINT_TYPE
|| code0 == VECTOR_TYPE)
&& code1 == INTEGER_TYPE)
{
doing_shift = true;
@ -11074,6 +11076,18 @@ build_binary_op (location_t location, enum tree_code code,
warning_at (location, OPT_Wshift_count_negative,
"left shift count is negative");
}
else if (code0 == VECTOR_TYPE)
{
if (compare_tree_int (op1,
TYPE_PRECISION (TREE_TYPE (type0)))
>= 0)
{
int_const = false;
if (c_inhibit_evaluation_warnings == 0)
warning_at (location, OPT_Wshift_count_overflow,
"left shift count >= width of vector element");
}
}
else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
{
int_const = false;

4
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2016-08-01 Jan Beulich <jbeulich@suse.com>
* gcc.dg/vshift-6.c, gcc.dg/vshift-7.c: New.
2016-07-31 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
* gcc.target/powerpc/divkc3-1.c: Require POWER8 hardware.

42
gcc/testsuite/gcc.dg/vshift-6.c Normal file
View File

@ -0,0 +1,42 @@
/* { dg-do compile } */
/* { dg-options "-Wshift-count-negative -Wshift-count-overflow" } */
typedef unsigned int v1qi_t __attribute__((mode(QI), vector_size(1)));
typedef unsigned int v1hi_t __attribute__((mode(HI), vector_size(2)));
typedef unsigned int v1si_t __attribute__((mode(SI), vector_size(4)));
v1qi_t test1qi(v1qi_t x, int c) {
switch(c) {
case 0: return x << -1; /* { dg-warning "shift count is negative" } */
case 1: return x << 7;
case 2: return x << 8; /* { dg-warning "shift count >= width" } */
case ~0: return x >> -1; /* { dg-warning "shift count is negative" } */
case ~1: return x >> 7;
case ~2: return x >> 8; /* { dg-warning "shift count >= width" } */
}
return c < 0 ? x >> -c : x << c;
}
v1hi_t test1hi(v1hi_t x, int c) {
switch(c) {
case 0: return x << -1; /* { dg-warning "shift count is negative" } */
case 1: return x << 15;
case 2: return x << 16; /* { dg-warning "shift count >= width" } */
case ~0: return x >> -1; /* { dg-warning "shift count is negative" } */
case ~1: return x >> 15;
case ~2: return x >> 16; /* { dg-warning "shift count >= width" } */
}
return c < 0 ? x >> -c : x << c;
}
v1si_t test1si(v1si_t x, int c) {
switch(c) {
case 0: return x << -1; /* { dg-warning "shift count is negative" } */
case 1: return x << 31;
case 2: return x << 32; /* { dg-warning "shift count >= width" } */
case ~0: return x >> -1; /* { dg-warning "shift count is negative" } */
case ~1: return x >> 31;
case ~2: return x >> 32; /* { dg-warning "shift count >= width" } */
}
return c < 0 ? x >> -c : x << c;
}

47
gcc/testsuite/gcc.dg/vshift-7.c Normal file
View File

@ -0,0 +1,47 @@
/* { dg-do compile } */
/* { dg-options "-O1 -Wshift-count-negative -Wshift-count-overflow" } */
typedef unsigned int v1qi_t __attribute__((mode(QI), vector_size(1)));
typedef unsigned int v1hi_t __attribute__((mode(HI), vector_size(2)));
typedef unsigned int v1si_t __attribute__((mode(SI), vector_size(4)));
static const signed shift_neg = -1;
static const unsigned shift_qi = 8;
static const unsigned shift_hi = 16;
static const unsigned shift_si = 32;
v1qi_t test1qi(v1qi_t x, int c) {
switch(c) {
case 0: return x << shift_neg; /* { dg-warning "shift count is negative" } */
case 1: return x << (shift_qi - 1);
case 2: return x << shift_qi; /* { dg-warning "shift count >= width" } */
case ~0: return x >> shift_neg; /* { dg-warning "shift count is negative" } */
case ~1: return x >> (shift_qi - 1);
case ~2: return x >> shift_qi; /* { dg-warning "shift count >= width" } */
}
return c < 0 ? x >> -c : x << c;
}
v1hi_t test1hi(v1hi_t x, int c) {
switch(c) {
case 0: return x << shift_neg; /* { dg-warning "shift count is negative" } */
case 1: return x << (shift_hi - 1);
case 2: return x << shift_hi; /* { dg-warning "shift count >= width" } */
case ~0: return x >> shift_neg; /* { dg-warning "shift count is negative" } */
case ~1: return x >> (shift_hi - 1);
case ~2: return x >> shift_hi; /* { dg-warning "shift count >= width" } */
}
return c < 0 ? x >> -c : x << c;
}
v1si_t test1si(v1si_t x, int c) {
switch(c) {
case 0: return x << shift_neg; /* { dg-warning "shift count is negative" } */
case 1: return x << (shift_si - 1);
case 2: return x << shift_si; /* { dg-warning "shift count >= width" } */
case ~0: return x >> shift_neg; /* { dg-warning "shift count is negative" } */
case ~1: return x >> (shift_si - 1);
case ~2: return x >> shift_si; /* { dg-warning "shift count >= width" } */
}
return c < 0 ? x >> -c : x << c;
}