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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2017-08-15 11:24:01 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2018-06-23 07:46:40 +0200 |
| commit | 01951278a60490735677920c86f139d627b22dbf (patch) | |
| tree | 44e9168eacaf2053a4b96bc52a4fb38b288e07a2 /Documentation | |
| parent | bf21036518acf0c3069c9c9e12b13fd09c8cdceb (diff) | |
| download | sparse-dev-01951278a60490735677920c86f139d627b22dbf.tar.gz | |
cast: specialize integer casts
Casts to integer used to be done with only 2 instructions:
OP_CAST & OP_SCAST.
Those are not very convenient as they don't reflect the real
operations that need to be done.
This patch specialize these instructions in:
- OP_TRUNC, for casts to a smaller type
- OP_ZEXT, for casts that need a zero extension
- OP_SEXT, for casts that need a sign extension
- Integer-to-integer casts of the same size are considered as
a NOPs and are, in fact, never emitted.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/IR.rst | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/Documentation/IR.rst b/Documentation/IR.rst index 1cce2de1..ff0ccdf2 100644 --- a/Documentation/IR.rst +++ b/Documentation/IR.rst @@ -267,11 +267,14 @@ They all have the following signature: Currently, a cast to a void pointer is treated like a cast to an unsigned integer of the same size. -.. op:: OP_CAST - Cast to unsigned integer. +.. op:: OP_TRUNC + Cast from integer to an integer of a smaller size. -.. op:: OP_SCAST - Cast to signed integer. +.. op:: OP_SEXT + Cast from integer to an integer of a bigger size with sign extension. + +.. op:: OP_ZEXT + Cast from integer to an integer of a bigger size with zero extension. .. op:: OP_UTPTR Cast from pointer-sized unsigned integer to pointer type. |