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[GlobalISel] Describe undefined values for G_SBFX/G_UBFX operands

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Differential Revision: https://reviews.llvm.org/D104245
This commit is contained in:
Brendon Cahoon 2021-06-14 13:10:50 -04:00
parent e88759a828
commit 5e0256758b
2 changed files with 10 additions and 2 deletions
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6
docs/GlobalISel/GenericOpcode.rst
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@ -252,6 +252,12 @@ The source operands are registers as follows:
- The least-significant bit for the extraction
- The width of the extraction
The least-significant bit (lsb) and width operands are in the range:
::
0 <= lsb < lsb + width <= source bitwidth, where all values are unsigned
G_SBFX sign-extends the result, while G_UBFX zero-extends the result.
.. code-block:: none

6
include/llvm/Target/GenericOpcodes.td
View File

@ -1379,14 +1379,16 @@ def G_BZERO : GenericInstruction {
// Bitfield extraction.
//------------------------------------------------------------------------------
// Generic signed bitfield extraction.
// Generic signed bitfield extraction. The operands are in the range
// 0 <= lsb < lsb + width <= src bitwidth, where all values are unsigned.
def G_SBFX : GenericInstruction {
let OutOperandList = (outs type0:$dst);
let InOperandList = (ins type0:$src, type1:$lsb, type1:$width);
let hasSideEffects = false;
}
// Generic unsigned bitfield extraction.
// Generic unsigned bitfield extraction. The operands are in the range
// 0 <= lsb < lsb + width <= src bitwidth, where all values are unsigned.
def G_UBFX : GenericInstruction {
let OutOperandList = (outs type0:$dst);
let InOperandList = (ins type0:$src, type1:$lsb, type1:$width);