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Document {L,R}ROTATE_EXPR

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The following amends the {L,R}SHIFT_EXPR documentation with
documentation about the {L,R}ROTATE_EXPR case.

	* doc/generic.texi ({L,R}ROTATE_EXPR): Document.
This commit is contained in:
Richard Biener 2023-10-20 12:00:33 +02:00
parent 1d0ca7ecd4
commit d6add7aa90
1 changed files with 11 additions and 7 deletions
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18
gcc/doc/generic.texi
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@ -1314,6 +1314,8 @@ The type of the node specifies the alignment of the access.
@tindex THROW_EXPR
@tindex LSHIFT_EXPR
@tindex RSHIFT_EXPR
@tindex LROTATE_EXPR
@tindex RROTATE_EXPR
@tindex BIT_IOR_EXPR
@tindex BIT_XOR_EXPR
@tindex BIT_AND_EXPR
@ -1480,17 +1482,19 @@ a fixed-point value to a floating-point value.
@item LSHIFT_EXPR
@itemx RSHIFT_EXPR
These nodes represent left and right shifts, respectively. The first
operand is the value to shift; it will always be of integral type. The
second operand is an expression for the number of bits by which to
shift. Right shift should be treated as arithmetic, i.e., the
high-order bits should be zero-filled when the expression has unsigned
type and filled with the sign bit when the expression has signed type.
@itemx LROTATE_EXPR
@itemx RROTATE_EXPR
These nodes represent left and right shifts and rotates, respectively.
The first operand is the value to shift or rotate; it will always be of
integral type. The second operand is an expression for the number of bits
by which to shift or rotate. Right shift should be treated as arithmetic,
i.e., the high-order bits should be zero-filled when the expression has
unsigned type and filled with the sign bit when the expression has signed type.
All other operations are logical, operating on the bit representation.
Note that the result is undefined if the second operand is larger
than or equal to the first operand's type size. Unlike most nodes, these
can have a vector as first operand and a scalar as second operand.
@item BIT_IOR_EXPR
@itemx BIT_XOR_EXPR
@itemx BIT_AND_EXPR