[mlir][emitc] Remove copy from scf.for lowering#94898
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Remove the copy into fresh variables done when lowering scf.for into emitc.for and use the variables carrying the init and iter values as the loop's results.
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@llvm/pr-subscribers-mlir-emitc @llvm/pr-subscribers-mlir Author: Gil Rapaport (aniragil) ChangesRemove the copy into fresh variables done when lowering scf.for into Full diff: https://github.com/llvm/llvm-project/pull/94898.diff 3 Files Affected:
diff --git a/mlir/lib/Conversion/SCFToEmitC/SCFToEmitC.cpp b/mlir/lib/Conversion/SCFToEmitC/SCFToEmitC.cpp
index 367142a520742..0a89242225255 100644
--- a/mlir/lib/Conversion/SCFToEmitC/SCFToEmitC.cpp
+++ b/mlir/lib/Conversion/SCFToEmitC/SCFToEmitC.cpp
@@ -102,10 +102,8 @@ LogicalResult ForLowering::matchAndRewrite(ForOp forOp,
// assigned to by emitc::assign ops within the loop body.
SmallVector<Value> resultVariables =
createVariablesForResults(forOp, rewriter);
- SmallVector<Value> iterArgsVariables =
- createVariablesForResults(forOp, rewriter);
- assignValues(forOp.getInits(), iterArgsVariables, rewriter, loc);
+ assignValues(forOp.getInits(), resultVariables, rewriter, loc);
emitc::ForOp loweredFor = rewriter.create<emitc::ForOp>(
loc, forOp.getLowerBound(), forOp.getUpperBound(), forOp.getStep());
@@ -117,15 +115,12 @@ LogicalResult ForLowering::matchAndRewrite(ForOp forOp,
SmallVector<Value> replacingValues;
replacingValues.push_back(loweredFor.getInductionVar());
- replacingValues.append(iterArgsVariables.begin(), iterArgsVariables.end());
+ replacingValues.append(resultVariables.begin(), resultVariables.end());
rewriter.mergeBlocks(forOp.getBody(), loweredBody, replacingValues);
- lowerYield(iterArgsVariables, rewriter,
+ lowerYield(resultVariables, rewriter,
cast<scf::YieldOp>(loweredBody->getTerminator()));
- // Copy iterArgs into results after the for loop.
- assignValues(iterArgsVariables, resultVariables, rewriter, loc);
-
rewriter.replaceOp(forOp, resultVariables);
return success();
}
diff --git a/mlir/test/Conversion/SCFToEmitC/for.mlir b/mlir/test/Conversion/SCFToEmitC/for.mlir
index 7f90310af2189..7e59eac3d4095 100644
--- a/mlir/test/Conversion/SCFToEmitC/for.mlir
+++ b/mlir/test/Conversion/SCFToEmitC/for.mlir
@@ -49,17 +49,13 @@ func.func @for_yield(%arg0 : index, %arg1 : index, %arg2 : index) -> (f32, f32)
// CHECK-NEXT: %[[VAL_4:.*]] = arith.constant 1.000000e+00 : f32
// CHECK-NEXT: %[[VAL_5:.*]] = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
// CHECK-NEXT: %[[VAL_6:.*]] = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
-// CHECK-NEXT: %[[VAL_7:.*]] = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
-// CHECK-NEXT: %[[VAL_8:.*]] = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
-// CHECK-NEXT: emitc.assign %[[VAL_3]] : f32 to %[[VAL_7]] : f32
-// CHECK-NEXT: emitc.assign %[[VAL_4]] : f32 to %[[VAL_8]] : f32
+// CHECK-NEXT: emitc.assign %[[VAL_3]] : f32 to %[[VAL_5]] : f32
+// CHECK-NEXT: emitc.assign %[[VAL_4]] : f32 to %[[VAL_6]] : f32
// CHECK-NEXT: emitc.for %[[VAL_9:.*]] = %[[VAL_0]] to %[[VAL_1]] step %[[VAL_2]] {
-// CHECK-NEXT: %[[VAL_10:.*]] = arith.addf %[[VAL_7]], %[[VAL_8]] : f32
-// CHECK-NEXT: emitc.assign %[[VAL_10]] : f32 to %[[VAL_7]] : f32
-// CHECK-NEXT: emitc.assign %[[VAL_10]] : f32 to %[[VAL_8]] : f32
+// CHECK-NEXT: %[[VAL_10:.*]] = arith.addf %[[VAL_5]], %[[VAL_6]] : f32
+// CHECK-NEXT: emitc.assign %[[VAL_10]] : f32 to %[[VAL_5]] : f32
+// CHECK-NEXT: emitc.assign %[[VAL_10]] : f32 to %[[VAL_6]] : f32
// CHECK-NEXT: }
-// CHECK-NEXT: emitc.assign %[[VAL_7]] : f32 to %[[VAL_5]] : f32
-// CHECK-NEXT: emitc.assign %[[VAL_8]] : f32 to %[[VAL_6]] : f32
// CHECK-NEXT: return %[[VAL_5]], %[[VAL_6]] : f32, f32
// CHECK-NEXT: }
@@ -78,19 +74,15 @@ func.func @nested_for_yield(%arg0 : index, %arg1 : index, %arg2 : index) -> f32
// CHECK-SAME: %[[VAL_0:.*]]: index, %[[VAL_1:.*]]: index, %[[VAL_2:.*]]: index) -> f32 {
// CHECK-NEXT: %[[VAL_3:.*]] = arith.constant 1.000000e+00 : f32
// CHECK-NEXT: %[[VAL_4:.*]] = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
-// CHECK-NEXT: %[[VAL_5:.*]] = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
-// CHECK-NEXT: emitc.assign %[[VAL_3]] : f32 to %[[VAL_5]] : f32
+// CHECK-NEXT: emitc.assign %[[VAL_3]] : f32 to %[[VAL_4]] : f32
// CHECK-NEXT: emitc.for %[[VAL_6:.*]] = %[[VAL_0]] to %[[VAL_1]] step %[[VAL_2]] {
// CHECK-NEXT: %[[VAL_7:.*]] = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
-// CHECK-NEXT: %[[VAL_8:.*]] = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
-// CHECK-NEXT: emitc.assign %[[VAL_5]] : f32 to %[[VAL_8]] : f32
+// CHECK-NEXT: emitc.assign %[[VAL_4]] : f32 to %[[VAL_7]] : f32
// CHECK-NEXT: emitc.for %[[VAL_9:.*]] = %[[VAL_0]] to %[[VAL_1]] step %[[VAL_2]] {
-// CHECK-NEXT: %[[VAL_10:.*]] = arith.addf %[[VAL_8]], %[[VAL_8]] : f32
-// CHECK-NEXT: emitc.assign %[[VAL_10]] : f32 to %[[VAL_8]] : f32
+// CHECK-NEXT: %[[VAL_10:.*]] = arith.addf %[[VAL_7]], %[[VAL_7]] : f32
+// CHECK-NEXT: emitc.assign %[[VAL_10]] : f32 to %[[VAL_7]] : f32
// CHECK-NEXT: }
-// CHECK-NEXT: emitc.assign %[[VAL_8]] : f32 to %[[VAL_7]] : f32
-// CHECK-NEXT: emitc.assign %[[VAL_7]] : f32 to %[[VAL_5]] : f32
+// CHECK-NEXT: emitc.assign %[[VAL_7]] : f32 to %[[VAL_4]] : f32
// CHECK-NEXT: }
-// CHECK-NEXT: emitc.assign %[[VAL_5]] : f32 to %[[VAL_4]] : f32
// CHECK-NEXT: return %[[VAL_4]] : f32
// CHECK-NEXT: }
diff --git a/mlir/test/Target/Cpp/for.mlir b/mlir/test/Target/Cpp/for.mlir
index 60988bcb46556..af1d829113f9d 100644
--- a/mlir/test/Target/Cpp/for.mlir
+++ b/mlir/test/Target/Cpp/for.mlir
@@ -40,8 +40,6 @@ func.func @test_for_yield() {
%s0 = "emitc.constant"() <{value = 0 : i32}> : () -> i32
%p0 = "emitc.constant"() <{value = 1.0 : f32}> : () -> f32
- %0 = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> i32
- %1 = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
%2 = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> i32
%3 = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
emitc.assign %s0 : i32 to %2 : i32
@@ -53,8 +51,6 @@ func.func @test_for_yield() {
emitc.assign %pn : f32 to %3 : f32
emitc.yield
}
- emitc.assign %2 : i32 to %0 : i32
- emitc.assign %3 : f32 to %1 : f32
return
}
@@ -64,8 +60,6 @@ func.func @test_for_yield() {
// CPP-DEFAULT-NEXT: size_t [[STEP:[^ ]*]] = 1;
// CPP-DEFAULT-NEXT: int32_t [[S0:[^ ]*]] = 0;
// CPP-DEFAULT-NEXT: float [[P0:[^ ]*]] = 1.000000000e+00f;
-// CPP-DEFAULT-NEXT: int32_t [[SE:[^ ]*]];
-// CPP-DEFAULT-NEXT: float [[PE:[^ ]*]];
// CPP-DEFAULT-NEXT: int32_t [[SI:[^ ]*]];
// CPP-DEFAULT-NEXT: float [[PI:[^ ]*]];
// CPP-DEFAULT-NEXT: [[SI:[^ ]*]] = [[S0]];
@@ -76,8 +70,6 @@ func.func @test_for_yield() {
// CPP-DEFAULT-NEXT: [[SI]] = [[SN]];
// CPP-DEFAULT-NEXT: [[PI]] = [[PN]];
// CPP-DEFAULT-NEXT: }
-// CPP-DEFAULT-NEXT: [[SE]] = [[SI]];
-// CPP-DEFAULT-NEXT: [[PE]] = [[PI]];
// CPP-DEFAULT-NEXT: return;
// CPP-DECLTOP: void test_for_yield() {
@@ -86,8 +78,6 @@ func.func @test_for_yield() {
// CPP-DECLTOP-NEXT: size_t [[STEP:[^ ]*]];
// CPP-DECLTOP-NEXT: int32_t [[S0:[^ ]*]];
// CPP-DECLTOP-NEXT: float [[P0:[^ ]*]];
-// CPP-DECLTOP-NEXT: int32_t [[SE:[^ ]*]];
-// CPP-DECLTOP-NEXT: float [[PE:[^ ]*]];
// CPP-DECLTOP-NEXT: int32_t [[SI:[^ ]*]];
// CPP-DECLTOP-NEXT: float [[PI:[^ ]*]];
// CPP-DECLTOP-NEXT: int32_t [[SN:[^ ]*]];
@@ -99,8 +89,6 @@ func.func @test_for_yield() {
// CPP-DECLTOP-NEXT: [[P0]] = 1.000000000e+00f;
// CPP-DECLTOP-NEXT: ;
// CPP-DECLTOP-NEXT: ;
-// CPP-DECLTOP-NEXT: ;
-// CPP-DECLTOP-NEXT: ;
// CPP-DECLTOP-NEXT: [[SI:[^ ]*]] = [[S0]];
// CPP-DECLTOP-NEXT: [[PI:[^ ]*]] = [[P0]];
// CPP-DECLTOP-NEXT: for (size_t [[ITER:[^ ]*]] = [[START]]; [[ITER]] < [[STOP]]; [[ITER]] += [[STEP]]) {
@@ -109,8 +97,6 @@ func.func @test_for_yield() {
// CPP-DECLTOP-NEXT: [[SI]] = [[SN]];
// CPP-DECLTOP-NEXT: [[PI]] = [[PN]];
// CPP-DECLTOP-NEXT: }
-// CPP-DECLTOP-NEXT: [[SE]] = [[SI]];
-// CPP-DECLTOP-NEXT: [[PE]] = [[PI]];
// CPP-DECLTOP-NEXT: return;
func.func @test_for_yield_2() {
@@ -121,8 +107,6 @@ func.func @test_for_yield_2() {
%s0 = emitc.literal "0" : i32
%p0 = emitc.literal "M_PI" : f32
- %0 = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> i32
- %1 = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
%2 = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> i32
%3 = "emitc.variable"() <{value = #emitc.opaque<"">}> : () -> f32
emitc.assign %s0 : i32 to %2 : i32
@@ -134,8 +118,6 @@ func.func @test_for_yield_2() {
emitc.assign %pn : f32 to %3 : f32
emitc.yield
}
- emitc.assign %2 : i32 to %0 : i32
- emitc.assign %3 : f32 to %1 : f32
return
}
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aniragil
requested review from
TinaAMD,
cferry-AMD,
marbre,
mgehre-amd and
simon-camp
cferry-AMD
approved these changes
Jun 10, 2024
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Remove the copy into fresh variables done when lowering scf.for into
emitc.for and use the variables carrying the init and iter values as
the loop's results.