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[mlir][Transforms] remove-dead-values: Rely on canonicalizer for region simplification #173505

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Merged
matthias-springer merged 1 commit into from
Jan 7, 2026
Merged

[mlir][Transforms] remove-dead-values: Rely on canonicalizer for region simplification #173505

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1 change: 1 addition & 0 deletions mlir/include/mlir/Transforms/Passes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ class GreedyRewriteConfig;
#define GEN_PASS_DECL_MEM2REG
#define GEN_PASS_DECL_PRINTIRPASS
#define GEN_PASS_DECL_PRINTOPSTATS
#define GEN_PASS_DECL_REMOVEDEADVALUES
#define GEN_PASS_DECL_SCCP
#define GEN_PASS_DECL_SROA
#define GEN_PASS_DECL_STRIPDEBUGINFO
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10 changes: 10 additions & 0 deletions mlir/include/mlir/Transforms/Passes.td
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Expand Up @@ -246,7 +246,17 @@ def RemoveDeadValues : Pass<"remove-dead-values"> {
do = square_and_double_of_y(5)
print(do)
```

Note: If `canonicalize` is set to "false", this pass does not remove any
block arguments / op results from ops that implement the
RegionBranchOpInterface. Instead, it just sets dead operands to
"ub.poison".
}];

let options = [
Option<"canonicalize", "canonicalize", "bool", /*default=*/"true",
"Canonicalize region branch ops">,
];
let constructor = "mlir::createRemoveDeadValuesPass()";
let dependentDialects = ["ub::UBDialect"];
}
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