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tree.def (LSHIFT_EXPR, [...]): Add commentary.

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gcc/
	* tree.def (LSHIFT_EXPR, RSHIFT_EXPR): Add commentary.
	* tree-cfg.c (verify_gimple_assign_binary): Allow shifts of
	fixed-point types, and vectors of the same.

From-SVN: r143061
This commit is contained in:
Richard Sandiford 2009-01-04 22:14:39 +00:00 committed by Richard Sandiford
parent 4f24c6d62f
commit 0009b473a0
3 changed files with 21 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2009-01-04 Richard Sandiford <rdsandiford@googlemail.com>
* tree.def (LSHIFT_EXPR, RSHIFT_EXPR): Add commentary.
* tree-cfg.c (verify_gimple_assign_binary): Allow shifts of
fixed-point types, and vectors of the same.
2009-01-04 Richard Sandiford <rdsandiford@googlemail.com>
* config/mips/sync.md (*mb_barrier): Rename to...

9
gcc/tree-cfg.c
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@ -3474,6 +3474,12 @@ verify_gimple_assign_binary (gimple stmt)
case LSHIFT_EXPR:
case RSHIFT_EXPR:
if (FIXED_POINT_TYPE_P (rhs1_type)
&& INTEGRAL_TYPE_P (rhs2_type)
&& useless_type_conversion_p (lhs_type, rhs1_type))
return false;
/* Fall through. */
case LROTATE_EXPR:
case RROTATE_EXPR:
{
@ -3495,7 +3501,8 @@ verify_gimple_assign_binary (gimple stmt)
case VEC_RSHIFT_EXPR:
{
if (TREE_CODE (rhs1_type) != VECTOR_TYPE
|| !INTEGRAL_TYPE_P (TREE_TYPE (rhs1_type))
|| !(INTEGRAL_TYPE_P (TREE_TYPE (rhs1_type))
|| FIXED_POINT_TYPE_P (TREE_TYPE (rhs1_type)))
|| (!INTEGRAL_TYPE_P (rhs2_type)
&& (TREE_CODE (rhs2_type) != VECTOR_TYPE
|| !INTEGRAL_TYPE_P (TREE_TYPE (rhs2_type))))

8
gcc/tree.def
View File

@ -691,7 +691,13 @@ DEFTREECODE (ABS_EXPR, "abs_expr", tcc_unary, 1)
The second operand is the number of bits to
shift by; it need not be the same type as the first operand and result.
Note that the result is undefined if the second operand is larger
than or equal to the first operand's type size. */
than or equal to the first operand's type size.
The first operand of a shift can have either an integer or a
(non-integer) fixed-point type. We follow the ISO/IEC TR 18037:2004
semantics for the latter.
Rotates are defined for integer types only. */
DEFTREECODE (LSHIFT_EXPR, "lshift_expr", tcc_binary, 2)
DEFTREECODE (RSHIFT_EXPR, "rshift_expr", tcc_binary, 2)
DEFTREECODE (LROTATE_EXPR, "lrotate_expr", tcc_binary, 2)