[Mlir-commits] [mlir] Reland "[mlir][arith] Canonicalization patterns for `arith.select` (#67809)" (PR #68941)
llvmlistbot at llvm.org
llvmlistbot at llvm.org
Thu Oct 12 17:26:46 PDT 2023
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-mlir
Author: Han-Chung Wang (hanhanW)
<details>
<summary>Changes</summary>
This cherry-picks the changes in
llvm-project/5bf701a6687a46fd898621f5077959ff202d716b with limiting types to i1.
I.e., it also applies the below patch:
```
diff --git a/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td b/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
index 9d38513215d3..817de0e06c66 100644
--- a/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
+++ b/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
@@ -263,7 +263,8 @@ def SelectAndNotCond :
Pat<(SelectOp $predA, (SelectOp $predB, $y, $x), $y),
(SelectOp (Arith_AndIOp $predA,
(Arith_XOrIOp $predB, (Arith_ConstantOp ConstantAttr<I1Attr, "1">))),
- $x, $y)>;
+ $x, $y),
+ [(Constraint<CPred<"$0.getType() == $_builder.getI1Type()">> $predB)]>;
// select(predA, x, select(predB, x, y)) => select(or(predA, predB), x, y)
def SelectOrCond :
@@ -275,7 +276,8 @@ def SelectOrNotCond :
Pat<(SelectOp $predA, $x, (SelectOp $predB, $y, $x)),
(SelectOp (Arith_OrIOp $predA,
(Arith_XOrIOp $predB, (Arith_ConstantOp ConstantAttr<I1Attr, "1">))),
- $x, $y)>;
+ $x, $y),
+ [(Constraint<CPred<"$0.getType() == $_builder.getI1Type()">> $predB)]>;
//===----------------------------------------------------------------------===//
// IndexCastOp
```
---
Full diff: https://github.com/llvm/llvm-project/pull/68941.diff
3 Files Affected:
- (modified) mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td (+46)
- (modified) mlir/lib/Dialect/Arith/IR/ArithOps.cpp (+3-1)
- (modified) mlir/test/Dialect/Arith/canonicalize.mlir (+76)
``````````diff
diff --git a/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td b/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
index f3d84d0b261e8dd..817de0e06c661b9 100644
--- a/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
+++ b/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
@@ -233,6 +233,52 @@ def CmpIExtUI :
CPred<"$0.getValue() == arith::CmpIPredicate::eq || "
"$0.getValue() == arith::CmpIPredicate::ne">> $pred)]>;
+//===----------------------------------------------------------------------===//
+// SelectOp
+//===----------------------------------------------------------------------===//
+
+// select(not(pred), a, b) => select(pred, b, a)
+def SelectNotCond :
+ Pat<(SelectOp (Arith_XOrIOp $pred, (ConstantLikeMatcher APIntAttr:$ones)), $a, $b),
+ (SelectOp $pred, $b, $a),
+ [(IsScalarOrSplatNegativeOne $ones)]>;
+
+// select(pred, select(pred, a, b), c) => select(pred, a, c)
+def RedundantSelectTrue :
+ Pat<(SelectOp $pred, (SelectOp $pred, $a, $b), $c),
+ (SelectOp $pred, $a, $c)>;
+
+// select(pred, a, select(pred, b, c)) => select(pred, a, c)
+def RedundantSelectFalse :
+ Pat<(SelectOp $pred, $a, (SelectOp $pred, $b, $c)),
+ (SelectOp $pred, $a, $c)>;
+
+// select(predA, select(predB, x, y), y) => select(and(predA, predB), x, y)
+def SelectAndCond :
+ Pat<(SelectOp $predA, (SelectOp $predB, $x, $y), $y),
+ (SelectOp (Arith_AndIOp $predA, $predB), $x, $y)>;
+
+// select(predA, select(predB, y, x), y) => select(and(predA, not(predB)), x, y)
+def SelectAndNotCond :
+ Pat<(SelectOp $predA, (SelectOp $predB, $y, $x), $y),
+ (SelectOp (Arith_AndIOp $predA,
+ (Arith_XOrIOp $predB, (Arith_ConstantOp ConstantAttr<I1Attr, "1">))),
+ $x, $y),
+ [(Constraint<CPred<"$0.getType() == $_builder.getI1Type()">> $predB)]>;
+
+// select(predA, x, select(predB, x, y)) => select(or(predA, predB), x, y)
+def SelectOrCond :
+ Pat<(SelectOp $predA, $x, (SelectOp $predB, $x, $y)),
+ (SelectOp (Arith_OrIOp $predA, $predB), $x, $y)>;
+
+// select(predA, x, select(predB, y, x)) => select(or(predA, not(predB)), x, y)
+def SelectOrNotCond :
+ Pat<(SelectOp $predA, $x, (SelectOp $predB, $y, $x)),
+ (SelectOp (Arith_OrIOp $predA,
+ (Arith_XOrIOp $predB, (Arith_ConstantOp ConstantAttr<I1Attr, "1">))),
+ $x, $y),
+ [(Constraint<CPred<"$0.getType() == $_builder.getI1Type()">> $predB)]>;
+
//===----------------------------------------------------------------------===//
// IndexCastOp
//===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Dialect/Arith/IR/ArithOps.cpp b/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
index ae8a6ef350ce191..0ecc288f3b07701 100644
--- a/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
+++ b/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
@@ -2212,7 +2212,9 @@ struct SelectToExtUI : public OpRewritePattern<arith::SelectOp> {
void arith::SelectOp::getCanonicalizationPatterns(RewritePatternSet &results,
MLIRContext *context) {
- results.add<SelectI1Simplify, SelectToExtUI>(context);
+ results.add<RedundantSelectFalse, RedundantSelectTrue, SelectI1Simplify,
+ SelectAndCond, SelectAndNotCond, SelectOrCond, SelectOrNotCond,
+ SelectNotCond, SelectToExtUI>(context);
}
OpFoldResult arith::SelectOp::fold(FoldAdaptor adaptor) {
diff --git a/mlir/test/Dialect/Arith/canonicalize.mlir b/mlir/test/Dialect/Arith/canonicalize.mlir
index f697f3d01458eee..1b0547c9e8f804a 100644
--- a/mlir/test/Dialect/Arith/canonicalize.mlir
+++ b/mlir/test/Dialect/Arith/canonicalize.mlir
@@ -128,6 +128,82 @@ func.func @selToArith(%arg0: i1, %arg1 : i1, %arg2 : i1) -> i1 {
return %res : i1
}
+// CHECK-LABEL: @redundantSelectTrue
+// CHECK-NEXT: %[[res:.+]] = arith.select %arg0, %arg1, %arg3
+// CHECK-NEXT: return %[[res]]
+func.func @redundantSelectTrue(%arg0: i1, %arg1 : i32, %arg2 : i32, %arg3 : i32) -> i32 {
+ %0 = arith.select %arg0, %arg1, %arg2 : i32
+ %res = arith.select %arg0, %0, %arg3 : i32
+ return %res : i32
+}
+
+// CHECK-LABEL: @redundantSelectFalse
+// CHECK-NEXT: %[[res:.+]] = arith.select %arg0, %arg3, %arg2
+// CHECK-NEXT: return %[[res]]
+func.func @redundantSelectFalse(%arg0: i1, %arg1 : i32, %arg2 : i32, %arg3 : i32) -> i32 {
+ %0 = arith.select %arg0, %arg1, %arg2 : i32
+ %res = arith.select %arg0, %arg3, %0 : i32
+ return %res : i32
+}
+
+// CHECK-LABEL: @selNotCond
+// CHECK-NEXT: %[[res1:.+]] = arith.select %arg0, %arg2, %arg1
+// CHECK-NEXT: %[[res2:.+]] = arith.select %arg0, %arg4, %arg3
+// CHECK-NEXT: return %[[res1]], %[[res2]]
+func.func @selNotCond(%arg0: i1, %arg1 : i32, %arg2 : i32, %arg3 : i32, %arg4 : i32) -> (i32, i32) {
+ %one = arith.constant 1 : i1
+ %cond1 = arith.xori %arg0, %one : i1
+ %cond2 = arith.xori %one, %arg0 : i1
+
+ %res1 = arith.select %cond1, %arg1, %arg2 : i32
+ %res2 = arith.select %cond2, %arg3, %arg4 : i32
+ return %res1, %res2 : i32, i32
+}
+
+// CHECK-LABEL: @selAndCond
+// CHECK-NEXT: %[[and:.+]] = arith.andi %arg1, %arg0
+// CHECK-NEXT: %[[res:.+]] = arith.select %[[and]], %arg2, %arg3
+// CHECK-NEXT: return %[[res]]
+func.func @selAndCond(%arg0: i1, %arg1: i1, %arg2 : i32, %arg3 : i32) -> i32 {
+ %sel = arith.select %arg0, %arg2, %arg3 : i32
+ %res = arith.select %arg1, %sel, %arg3 : i32
+ return %res : i32
+}
+
+// CHECK-LABEL: @selAndNotCond
+// CHECK-NEXT: %[[one:.+]] = arith.constant true
+// CHECK-NEXT: %[[not:.+]] = arith.xori %arg0, %[[one]]
+// CHECK-NEXT: %[[and:.+]] = arith.andi %arg1, %[[not]]
+// CHECK-NEXT: %[[res:.+]] = arith.select %[[and]], %arg3, %arg2
+// CHECK-NEXT: return %[[res]]
+func.func @selAndNotCond(%arg0: i1, %arg1: i1, %arg2 : i32, %arg3 : i32) -> i32 {
+ %sel = arith.select %arg0, %arg2, %arg3 : i32
+ %res = arith.select %arg1, %sel, %arg2 : i32
+ return %res : i32
+}
+
+// CHECK-LABEL: @selOrCond
+// CHECK-NEXT: %[[or:.+]] = arith.ori %arg1, %arg0
+// CHECK-NEXT: %[[res:.+]] = arith.select %[[or]], %arg2, %arg3
+// CHECK-NEXT: return %[[res]]
+func.func @selOrCond(%arg0: i1, %arg1: i1, %arg2 : i32, %arg3 : i32) -> i32 {
+ %sel = arith.select %arg0, %arg2, %arg3 : i32
+ %res = arith.select %arg1, %arg2, %sel : i32
+ return %res : i32
+}
+
+// CHECK-LABEL: @selOrNotCond
+// CHECK-NEXT: %[[one:.+]] = arith.constant true
+// CHECK-NEXT: %[[not:.+]] = arith.xori %arg0, %[[one]]
+// CHECK-NEXT: %[[or:.+]] = arith.ori %arg1, %[[not]]
+// CHECK-NEXT: %[[res:.+]] = arith.select %[[or]], %arg3, %arg2
+// CHECK-NEXT: return %[[res]]
+func.func @selOrNotCond(%arg0: i1, %arg1: i1, %arg2 : i32, %arg3 : i32) -> i32 {
+ %sel = arith.select %arg0, %arg2, %arg3 : i32
+ %res = arith.select %arg1, %arg3, %sel : i32
+ return %res : i32
+}
+
// Test case: Folding of comparisons with equal operands.
// CHECK-LABEL: @cmpi_equal_operands
// CHECK-DAG: %[[T:.*]] = arith.constant true
``````````
</details>
https://github.com/llvm/llvm-project/pull/68941
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