[Flang][AArch64][VecLib] Add libmvec support for Flang/AArch64 #146453
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`-fveclib=libmvec` for AArch64 (NEON and SVE) in Clang was supported by llvm#143696. This patch does the same for Flang. Vector functions defined in `libmvec` are used for the following Fortran operator and functions currently. - Power operator (`**`) - Fortran intrinsic functions listed below for `real(kind=4)` and `real(kind=8)` (including their coresponding specific intrinsic functions) - Fortran intrinsic functions which are expanded using functions listed below (for example, `sin` for `complex(kind=8)`) ``` sin tan cos asin acos atan (both atan(x) and atan(y, x)) atan2 cosh tanh asinh acosh atanh erf erfc exp log log10 ``` As with Clang/AArch64, glibc 2.40 or higher is required to use all these functions.
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@llvm/pr-subscribers-clang-driver @llvm/pr-subscribers-backend-aarch64 Author: KAWASHIMA Takahiro (kawashima-fj) Changes
Vector functions defined in
As with Clang/AArch64, glibc 2.40 or higher is required to use all these functions. Full diff: https://github.com/llvm/llvm-project/pull/146453.diff 4 Files Affected:
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index e4e321ba1e195..75ba2af543c7a 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -484,11 +484,18 @@ void Flang::addTargetOptions(const ArgList &Args,
Triple.getArch() != llvm::Triple::x86_64)
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< Name << Triple.getArchName();
- } else if (Name == "libmvec" || Name == "AMDLIBM") {
+ } else if (Name == "AMDLIBM") {
if (Triple.getArch() != llvm::Triple::x86 &&
Triple.getArch() != llvm::Triple::x86_64)
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< Name << Triple.getArchName();
+ } else if (Name == "libmvec") {
+ if (Triple.getArch() != llvm::Triple::x86 &&
+ Triple.getArch() != llvm::Triple::x86_64 &&
+ Triple.getArch() != llvm::Triple::aarch64 &&
+ Triple.getArch() != llvm::Triple::aarch64_be)
+ D.Diag(diag::err_drv_unsupported_opt_for_target)
+ << Name << Triple.getArchName();
} else if (Name == "SLEEF" || Name == "ArmPL") {
if (Triple.getArch() != llvm::Triple::aarch64 &&
Triple.getArch() != llvm::Triple::aarch64_be)
diff --git a/flang/docs/ReleaseNotes.md b/flang/docs/ReleaseNotes.md
index 35da8323e0a10..bd3a215323de2 100644
--- a/flang/docs/ReleaseNotes.md
+++ b/flang/docs/ReleaseNotes.md
@@ -34,6 +34,7 @@ page](https://llvm.org/releases/).
* -floop-interchange is now recognized by flang.
* -floop-interchange is enabled by default at -O2 and above.
+* -fveclib=libmvec is supported for AArch64 (same as Flang/x86 and Clang/AArch64)
## Windows Support
diff --git a/flang/test/Driver/fveclib-codegen.f90 b/flang/test/Driver/fveclib-codegen.f90
index 4cbb1e284f18e..88b31da40167e 100644
--- a/flang/test/Driver/fveclib-codegen.f90
+++ b/flang/test/Driver/fveclib-codegen.f90
@@ -1,6 +1,8 @@
! test that -fveclib= is passed to the backend
! RUN: %if aarch64-registered-target %{ %flang -S -Ofast -target aarch64-unknown-linux-gnu -fveclib=SLEEF -o - %s | FileCheck %s --check-prefix=SLEEF %}
! RUN: %if x86-registered-target %{ %flang -S -Ofast -target x86_64-unknown-linux-gnu -fveclib=libmvec -o - %s | FileCheck %s %}
+! RUN: %if aarch64-registered-target %{ %flang -S -Ofast -target aarch64-unknown-linux-gnu -fveclib=libmvec -march=armv8.2-a+nosve -o - %s | FileCheck %s --check-prefix=LIBMVEC-AARCH64-NEON %}
+! RUN: %if aarch64-registered-target %{ %flang -S -Ofast -target aarch64-unknown-linux-gnu -fveclib=libmvec -march=armv8.2-a+sve -o - %s | FileCheck %s --check-prefix=LIBMVEC-AARCH64-SVE %}
! RUN: %if x86-registered-target %{ %flang -S -O3 -ffast-math -target x86_64-unknown-linux-gnu -fveclib=AMDLIBM -o - %s | FileCheck %s --check-prefix=AMDLIBM %}
! RUN: %flang -S -Ofast -fveclib=NoLibrary -o - %s | FileCheck %s --check-prefix=NOLIB
@@ -11,6 +13,8 @@ subroutine sb(a, b)
! check that we used a vectorized call to powf()
! CHECK: _ZGVbN4vv_powf
! SLEEF: _ZGVnN4vv_powf
+! LIBMVEC-AARCH64-NEON: _ZGVnN4vv_powf
+! LIBMVEC-AARCH64-SVE: _ZGVsMxvv_powf
! AMDLIBM: amd_vrs4_powf
! NOLIB: powf
a(i) = a(i) ** b(i)
diff --git a/flang/test/Driver/fveclib.f90 b/flang/test/Driver/fveclib.f90
index 431a4bfc02522..d21e85e486f8d 100644
--- a/flang/test/Driver/fveclib.f90
+++ b/flang/test/Driver/fveclib.f90
@@ -1,6 +1,7 @@
! RUN: %flang -### -c -fveclib=none %s 2>&1 | FileCheck -check-prefix CHECK-NOLIB %s
! RUN: %flang -### -c -fveclib=Accelerate %s 2>&1 | FileCheck -check-prefix CHECK-ACCELERATE %s
! RUN: %flang -### -c --target=x86_64-unknown-linux-gnu -fveclib=libmvec %s 2>&1 | FileCheck -check-prefix CHECK-libmvec %s
+! RUN: %flang -### -c --target=aarch64-unknown-linux-gnu -fveclib=libmvec %s 2>&1 | FileCheck -check-prefix CHECK-libmvec %s
! RUN: %flang -### -c -fveclib=MASSV %s 2>&1 | FileCheck -check-prefix CHECK-MASSV %s
! RUN: %flang -### -c -fveclib=Darwin_libsystem_m %s 2>&1 | FileCheck -check-prefix CHECK-DARWIN_LIBSYSTEM_M %s
! RUN: %flang -### -c --target=aarch64-none-none -fveclib=SLEEF %s 2>&1 | FileCheck -check-prefix CHECK-SLEEF %s
@@ -23,7 +24,7 @@
! RUN: not %flang --target=x86-none-none -c -fveclib=SLEEF %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
! RUN: not %flang --target=x86-none-none -c -fveclib=ArmPL %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
-! RUN: not %flang --target=aarch64-none-none -c -fveclib=libmvec %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
+! RUN: not %flang --target=riscv64-none-none -c -fveclib=libmvec %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
! RUN: not %flang --target=aarch64-none-none -c -fveclib=SVML %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
! RUN: not %flang --target=aarch64-none-none -c -fveclib=AMDLIBM %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
! CHECK-ERROR: unsupported option {{.*}} for target
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@llvm/pr-subscribers-flang-driver Author: KAWASHIMA Takahiro (kawashima-fj) Changes
Vector functions defined in
As with Clang/AArch64, glibc 2.40 or higher is required to use all these functions. Full diff: https://github.com/llvm/llvm-project/pull/146453.diff 4 Files Affected:
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index e4e321ba1e195..75ba2af543c7a 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -484,11 +484,18 @@ void Flang::addTargetOptions(const ArgList &Args,
Triple.getArch() != llvm::Triple::x86_64)
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< Name << Triple.getArchName();
- } else if (Name == "libmvec" || Name == "AMDLIBM") {
+ } else if (Name == "AMDLIBM") {
if (Triple.getArch() != llvm::Triple::x86 &&
Triple.getArch() != llvm::Triple::x86_64)
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< Name << Triple.getArchName();
+ } else if (Name == "libmvec") {
+ if (Triple.getArch() != llvm::Triple::x86 &&
+ Triple.getArch() != llvm::Triple::x86_64 &&
+ Triple.getArch() != llvm::Triple::aarch64 &&
+ Triple.getArch() != llvm::Triple::aarch64_be)
+ D.Diag(diag::err_drv_unsupported_opt_for_target)
+ << Name << Triple.getArchName();
} else if (Name == "SLEEF" || Name == "ArmPL") {
if (Triple.getArch() != llvm::Triple::aarch64 &&
Triple.getArch() != llvm::Triple::aarch64_be)
diff --git a/flang/docs/ReleaseNotes.md b/flang/docs/ReleaseNotes.md
index 35da8323e0a10..bd3a215323de2 100644
--- a/flang/docs/ReleaseNotes.md
+++ b/flang/docs/ReleaseNotes.md
@@ -34,6 +34,7 @@ page](https://llvm.org/releases/).
* -floop-interchange is now recognized by flang.
* -floop-interchange is enabled by default at -O2 and above.
+* -fveclib=libmvec is supported for AArch64 (same as Flang/x86 and Clang/AArch64)
## Windows Support
diff --git a/flang/test/Driver/fveclib-codegen.f90 b/flang/test/Driver/fveclib-codegen.f90
index 4cbb1e284f18e..88b31da40167e 100644
--- a/flang/test/Driver/fveclib-codegen.f90
+++ b/flang/test/Driver/fveclib-codegen.f90
@@ -1,6 +1,8 @@
! test that -fveclib= is passed to the backend
! RUN: %if aarch64-registered-target %{ %flang -S -Ofast -target aarch64-unknown-linux-gnu -fveclib=SLEEF -o - %s | FileCheck %s --check-prefix=SLEEF %}
! RUN: %if x86-registered-target %{ %flang -S -Ofast -target x86_64-unknown-linux-gnu -fveclib=libmvec -o - %s | FileCheck %s %}
+! RUN: %if aarch64-registered-target %{ %flang -S -Ofast -target aarch64-unknown-linux-gnu -fveclib=libmvec -march=armv8.2-a+nosve -o - %s | FileCheck %s --check-prefix=LIBMVEC-AARCH64-NEON %}
+! RUN: %if aarch64-registered-target %{ %flang -S -Ofast -target aarch64-unknown-linux-gnu -fveclib=libmvec -march=armv8.2-a+sve -o - %s | FileCheck %s --check-prefix=LIBMVEC-AARCH64-SVE %}
! RUN: %if x86-registered-target %{ %flang -S -O3 -ffast-math -target x86_64-unknown-linux-gnu -fveclib=AMDLIBM -o - %s | FileCheck %s --check-prefix=AMDLIBM %}
! RUN: %flang -S -Ofast -fveclib=NoLibrary -o - %s | FileCheck %s --check-prefix=NOLIB
@@ -11,6 +13,8 @@ subroutine sb(a, b)
! check that we used a vectorized call to powf()
! CHECK: _ZGVbN4vv_powf
! SLEEF: _ZGVnN4vv_powf
+! LIBMVEC-AARCH64-NEON: _ZGVnN4vv_powf
+! LIBMVEC-AARCH64-SVE: _ZGVsMxvv_powf
! AMDLIBM: amd_vrs4_powf
! NOLIB: powf
a(i) = a(i) ** b(i)
diff --git a/flang/test/Driver/fveclib.f90 b/flang/test/Driver/fveclib.f90
index 431a4bfc02522..d21e85e486f8d 100644
--- a/flang/test/Driver/fveclib.f90
+++ b/flang/test/Driver/fveclib.f90
@@ -1,6 +1,7 @@
! RUN: %flang -### -c -fveclib=none %s 2>&1 | FileCheck -check-prefix CHECK-NOLIB %s
! RUN: %flang -### -c -fveclib=Accelerate %s 2>&1 | FileCheck -check-prefix CHECK-ACCELERATE %s
! RUN: %flang -### -c --target=x86_64-unknown-linux-gnu -fveclib=libmvec %s 2>&1 | FileCheck -check-prefix CHECK-libmvec %s
+! RUN: %flang -### -c --target=aarch64-unknown-linux-gnu -fveclib=libmvec %s 2>&1 | FileCheck -check-prefix CHECK-libmvec %s
! RUN: %flang -### -c -fveclib=MASSV %s 2>&1 | FileCheck -check-prefix CHECK-MASSV %s
! RUN: %flang -### -c -fveclib=Darwin_libsystem_m %s 2>&1 | FileCheck -check-prefix CHECK-DARWIN_LIBSYSTEM_M %s
! RUN: %flang -### -c --target=aarch64-none-none -fveclib=SLEEF %s 2>&1 | FileCheck -check-prefix CHECK-SLEEF %s
@@ -23,7 +24,7 @@
! RUN: not %flang --target=x86-none-none -c -fveclib=SLEEF %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
! RUN: not %flang --target=x86-none-none -c -fveclib=ArmPL %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
-! RUN: not %flang --target=aarch64-none-none -c -fveclib=libmvec %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
+! RUN: not %flang --target=riscv64-none-none -c -fveclib=libmvec %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
! RUN: not %flang --target=aarch64-none-none -c -fveclib=SVML %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
! RUN: not %flang --target=aarch64-none-none -c -fveclib=AMDLIBM %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
! CHECK-ERROR: unsupported option {{.*}} for target
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MacDue
reviewed
Jul 1, 2025
There was a problem hiding this comment.
You may also want to change Options.td. Currently, the note about needing GLIBC 2.40 is only displayed for Clang as it's under HelpTextForVariants<[ClangOption, CC1Option]:
llvm-project/clang/include/clang/Driver/Options.td
Lines 3491 to 3494 in cb80651
tblah
approved these changes
Jul 1, 2025
tarunprabhu
reviewed
Jul 1, 2025
| @@ -3487,7 +3487,8 @@ def fno_experimental_isel : Flag<["-"], "fno-experimental-isel">, Group<f_clang_ | |||
| Alias<fno_global_isel>; | |||
| def fveclib : Joined<["-"], "fveclib=">, Group<f_Group>, | |||
| Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>, | |||
| HelpText<"Use the given vector functions library">, | |||
| HelpText<"Use the given vector functions library.\n" | |||
| " Note: -fveclib=libmvec on AArch64 requires GLIBC 2.40 or newer.">, | |||
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Is the constraint on glibc >=2.40 true for clang as well? What happens if the user attempts to build with an older glibc? Will they see a configure-time error or will the build fail?
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Ach. Please ignore the question about the constraint on glibc. The second question about failure modes with older glibc still holds though.
There was a problem hiding this comment.
The toolchain user will see a link time failure when trying to resolve a call to a vector math routine. Note: the exact requirement depends on the function in question, but version 2.40 is what was used when deciding which math functions to add mappings for.
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-fveclib=libmvecfor AArch64 (NEON and SVE) in Clang was supported by #143696. This patch does the same for Flang.Vector functions defined in
libmvecare used for the following Fortran operator and functions currently.**)real(kind=4)andreal(kind=8)(including their coresponding specific intrinsic functions)sinforcomplex(kind=8))As with Clang/AArch64, glibc 2.40 or higher is required to use all these functions.