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[GlobalIsel] Update MIR gallery #107903

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Merged
merged 2 commits into from
Sep 10, 2024
Merged

[GlobalIsel] Update MIR gallery #107903

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edaf6a2
[GlobalIsel] Update MIR gallery
tschuett Sep 9, 2024
f3c3361
fix alignment
tschuett Sep 9, 2024
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19 changes: 18 additions & 1 deletion llvm/docs/GlobalISel/MIRPatterns.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -601,7 +601,7 @@ Gallery
=======

We should use precise patterns that state our intentions. Please avoid
using wip_match_opcode in patterns.
using wip_match_opcode in patterns. It can lead to imprecise patterns.

.. code-block:: text
:caption: Example fold zext(trunc:nuw)
Expand Down Expand Up @@ -630,3 +630,20 @@ using wip_match_opcode in patterns.
(G_ZEXT $root, $src),
[{ return Helper.matchZextOfTrunc(${root}, ${matchinfo}); }]),
(apply [{ Helper.applyBuildFnMO(${root}, ${matchinfo}); }])>;


// Precise: lists all combine combinations
class ext_of_ext_opcodes<Instruction ext1Opcode, Instruction ext2Opcode> : GICombineRule <
(defs root:$root, build_fn_matchinfo:$matchinfo),
(match (ext2Opcode $second, $src):$Second,
(ext1Opcode $root, $second):$First,
[{ return Helper.matchExtOfExt(*${First}, *${Second}, ${matchinfo}); }]),
(apply [{ Helper.applyBuildFn(*${First}, ${matchinfo}); }])>;

def zext_of_zext : ext_of_ext_opcodes<G_ZEXT, G_ZEXT>;
def zext_of_anyext : ext_of_ext_opcodes<G_ZEXT, G_ANYEXT>;
def sext_of_sext : ext_of_ext_opcodes<G_SEXT, G_SEXT>;
def sext_of_anyext : ext_of_ext_opcodes<G_SEXT, G_ANYEXT>;
def anyext_of_anyext : ext_of_ext_opcodes<G_ANYEXT, G_ANYEXT>;
def anyext_of_zext : ext_of_ext_opcodes<G_ANYEXT, G_ZEXT>;
def anyext_of_sext : ext_of_ext_opcodes<G_ANYEXT, G_SEXT>;
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