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Add missing expansion patterns for math.powf #14614

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merged 7 commits into from
Sep 6, 2023
Merged

Add missing expansion patterns for math.powf #14614

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d66244b
Add missing expansion patterns for `math.powf`
dcaballe Aug 9, 2023
88051b6
Merge remote-tracking branch 'origin/main' into powf
dcaballe Aug 21, 2023
30edcea
Merge remote-tracking branch 'origin/main' into powf
dcaballe Aug 25, 2023
0af5de2
Cherry-pick powf fix for negative numbers
dcaballe Aug 25, 2023
54f95d4
Merge remote-tracking branch 'origin/main' into powf
dcaballe Aug 28, 2023
c1fc034
Merge remote-tracking branch 'origin/main' into powf
dcaballe Sep 6, 2023
07cb54c
Merge remote-tracking branch 'origin/main' into powf
dcaballe Sep 6, 2023
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1 change: 1 addition & 0 deletions compiler/src/iree/compiler/Codegen/Common/PolynomialApproximationPass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@ class PolynomialApproximationPass
RewritePatternSet mathPatterns(&getContext());
populateExpandTanPattern(mathPatterns);
populateExpandExp2FPattern(mathPatterns);
populateExpandPowFPattern(mathPatterns);
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It's not clear to me what qualifies the expansions to be here or in the if-else statement below... but this should be similar to Exp2

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IIUC, it should be inside if-then-else if you are worried the approximation is not precise enough. As far as I know, if exp2 is precise enough then this shouldn't cause a huge issue.


if (clNativeMathPrecision) {
mathPatterns.add<math::ErfPolynomialApproximation>(&getContext());
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13 changes: 11 additions & 2 deletions compiler/src/iree/compiler/Codegen/Common/test/polynomial_approximation.mlir
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@@ -1,8 +1,17 @@
// RUN: iree-opt --iree-codegen-polynomial-approximation %s | FileCheck %s
// RUN: iree-opt --iree-codegen-polynomial-approximation --split-input-file %s | FileCheck %s

// CHECK-LABEL: @polynomial_tan
func.func @polynomial_tan(%arg0: f32) -> f32 {
// CHECK-NOT: math.tan
%0 = math.tan %arg0 : f32
%0 = math.tan %arg0 : f32
return %0 : f32
}

// -----

// CHECK-LABEL: @expanded_pow
func.func @expanded_pow(%arg0: f32, %arg1: f32) -> f32 {
// CHECK-NOT: math.pow
%0 = math.powf %arg0, %arg1 : f32
return %0 : f32
}
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