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[AArch64][NEON] NEON intrinsic compilation error with -fno-lax-vector-conversion flag fix (#149329)

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Issue originally raised in
https://github.com/llvm/llvm-project/issues/71362#issuecomment-3028515618.
Certain NEON intrinsics that operate on poly types (e.g. poly8x8_t)
failed to compile with the -fno-lax-vector-conversions flag. This patch
updates NeonEmitter.cpp to insert an explicit __builtin_bit_cast from
poly types to the required signed integer vector types when generating
lane-related intrinsics. A test 'neon-bitcast-poly.ll' is included.
This commit is contained in:
Amina Chabane 2025-07-30 10:56:14 +01:00 committed by GitHub
parent 2ec91a5ec4
commit 62744f3681
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GPG Key ID: B5690EEEBB952194
4 changed files with 7 additions and 9 deletions
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2
clang/test/CodeGen/AArch64/neon-scalar-copy.c
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@ -1,4 +1,4 @@
// RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon \
// RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon -flax-vector-conversions=none\
// RUN: -disable-O0-optnone -emit-llvm -o - %s | opt -S -passes=mem2reg | FileCheck %s
// REQUIRES: aarch64-registered-target || arm-registered-target

2
clang/test/CodeGen/AArch64/neon-vget.c
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@ -1,4 +1,4 @@
// RUN: %clang_cc1 -triple arm64-apple-darwin -target-feature +neon \
// RUN: %clang_cc1 -triple arm64-apple-darwin -target-feature +neon -flax-vector-conversions=none \
// RUN: -disable-O0-optnone -emit-llvm -o - %s \
// RUN: | opt -S -passes=mem2reg | FileCheck %s

2
clang/test/CodeGen/AArch64/poly64.c
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@ -1,5 +1,5 @@
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
// RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon \
// RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon -flax-vector-conversions=none\
// RUN: -ffp-contract=fast -disable-O0-optnone -emit-llvm -o - %s | opt -S -passes=mem2reg,sroa \
// RUN: | FileCheck %s

6
clang/utils/TableGen/NeonEmitter.cpp
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@ -1401,14 +1401,12 @@ void Intrinsic::emitBodyAsBuiltinCall() {
if (LocalCK == ClassB || (T.isHalf() && !T.isScalarForMangling())) {
CastToType.makeInteger(8, true);
Arg = "__builtin_bit_cast(" + CastToType.str() + ", " + Arg + ")";
} else if (LocalCK == ClassI) {
if (CastToType.isInteger()) {
} else if (LocalCK == ClassI &&
(CastToType.isInteger() || CastToType.isPoly())) {
CastToType.makeSigned();
Arg = "__builtin_bit_cast(" + CastToType.str() + ", " + Arg + ")";
}
}
}
S += Arg + ", ";
}