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[flang] optimize asind precision (#154350)

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Part of https://github.com/llvm/llvm-project/issues/150452.
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Connector Switch 2025-08-19 23:54:09 +08:00 committed by GitHub
parent a5f1ddd115
commit a0eb9958eb
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2 changed files with 19 additions and 8 deletions
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9
flang/lib/Optimizer/Builder/IntrinsicCall.cpp
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@ -2841,10 +2841,11 @@ mlir::Value IntrinsicLibrary::genAsind(mlir::Type resultType,
mlir::FunctionType::get(context, {resultType}, {args[0].getType()});
mlir::Value result =
getRuntimeCallGenerator("asin", ftype)(builder, loc, {args[0]});
llvm::APFloat pi = llvm::APFloat(llvm::numbers::pi);
mlir::Value dfactor = builder.createRealConstant(
loc, mlir::Float64Type::get(context), llvm::APFloat(180.0) / pi);
mlir::Value factor = builder.createConvert(loc, args[0].getType(), dfactor);
const llvm::fltSemantics &fltSem =
llvm::cast<mlir::FloatType>(resultType).getFloatSemantics();
llvm::APFloat pi = llvm::APFloat(fltSem, llvm::numbers::pis);
mlir::Value factor = builder.createRealConstant(
loc, resultType, llvm::APFloat(fltSem, "180.0") / pi);
return mlir::arith::MulFOp::create(builder, loc, result, factor);
}

18
flang/test/Lower/Intrinsics/asind.f90
View File

@ -1,3 +1,4 @@
! REQUIRES: flang-supports-f128-math
! RUN: %flang_fc1 -emit-fir %s -o - | FileCheck %s --check-prefixes="CHECK"
function test_real4(x)
@ -6,9 +7,8 @@ function test_real4(x)
end function
! CHECK-LABEL: @_QPtest_real4
! CHECK: %[[dfactor:.*]] = arith.constant 57.295779513082323 : f64
! CHECK: %[[factor:.*]] = arith.constant 57.2957763 : f32
! CHECK: %[[result:.*]] = math.asin %{{.*}} fastmath<contract> : f32
! CHECK: %[[factor:.*]] = fir.convert %[[dfactor]] : (f64) -> f32
! CHECK: %[[arg:.*]] = arith.mulf %[[result]], %[[factor]] fastmath<contract> : f32
function test_real8(x)
@ -17,6 +17,16 @@ function test_real8(x)
end function
! CHECK-LABEL: @_QPtest_real8
! CHECK: %[[dfactor:.*]] = arith.constant 57.295779513082323 : f64
! CHECK: %[[factor:.*]] = arith.constant 57.295779513082323 : f64
! CHECK: %[[result:.*]] = math.asin %{{.*}} fastmath<contract> : f64
! CHECK: %[[arg:.*]] = arith.mulf %[[result]], %[[dfactor]] fastmath<contract> : f64
! CHECK: %[[arg:.*]] = arith.mulf %[[result]], %[[factor]] fastmath<contract> : f64
function test_real16(x)
real(16) :: x, test_real16
test_real16 = asind(x)
end function
! CHECK-LABEL: @_QPtest_real16
! CHECK: %[[factor:.*]] = arith.constant 57.295779513082320876798154814105{{.*}} : f128
! CHECK: %[[result:.*]] = fir.call @_FortranAAsinF128({{.*}}) fastmath<contract> : (f128) -> f128
! CHECK: %[[arg:.*]] = arith.mulf %[[result]], %[[factor]] fastmath<contract> : f128