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llvm-project/clang/test/CodeGen/ppc64-elf-abi.c

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[PowerPC] Support ELFv1/ELFv2 ABI selection via -mabi= option While Clang now supports both ELFv1 and ELFv2 ABIs, their use is currently hard-coded via the target triple: powerpc64-linux is always ELFv1, while powerpc64le-linux is always ELFv2. These are of course the most common scenarios, but in principle it is possible to support the ELFv2 ABI on big-endian or the ELFv1 ABI on little-endian systems (and GCC does support that), and there are some special use cases for that (e.g. certain Linux kernel versions could only be built using ELFv1 on LE). This patch implements the Clang side of supporting this, based on the LLVM commit 214072. The command line options -mabi=elfv1 or -mabi=elfv2 select the desired ABI if present. (If not, Clang uses the same default rules as now.) Specifically, the patch implements the following changes based on the presence of the -mabi= option: In the driver: - Pass the appropiate -target-abi flag to the back-end - Select the correct dynamic loader version (/lib64/ld64.so.[12]) In the preprocessor: - Define _CALL_ELF to the appropriate value (1 or 2) In the compiler back-end: - Select the correct ABI in TargetInfo.cpp - Select the desired ABI for LLVM via feature (elfv1/elfv2) llvm-svn: 214074
2014-07-28 21:17:52 +08:00
// REQUIRES: powerpc-registered-target
// Verify ABI selection by the front end
// RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s \
// RUN: | FileCheck %s --check-prefix=CHECK-ELFv1
// RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s \
// RUN: -target-abi elfv1 | FileCheck %s --check-prefix=CHECK-ELFv1
// RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s \
[PowerPC] ABI support for the QPX vector instruction set Support for the QPX vector instruction set, used on the IBM BG/Q supercomputer, has recently been added to the LLVM PowerPC backend. This vector instruction set requires some ABI modifications because the ABI on the BG/Q expects <4 x double> vectors to be provided with 32-byte stack alignment, and to be handled as native vector types (similar to how Altivec vectors are handled on mainline PPC systems). I've named this ABI variant elfv1-qpx, have made this the default ABI when QPX is supported, and have updated the ABI handling code to provide QPX vectors with the correct stack alignment and associated register-assignment logic. llvm-svn: 231960
2015-03-12 03:14:15 +08:00
// RUN: -target-abi elfv1-qpx | FileCheck %s --check-prefix=CHECK-ELFv1
// RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s \
[PowerPC] Support ELFv1/ELFv2 ABI selection via -mabi= option While Clang now supports both ELFv1 and ELFv2 ABIs, their use is currently hard-coded via the target triple: powerpc64-linux is always ELFv1, while powerpc64le-linux is always ELFv2. These are of course the most common scenarios, but in principle it is possible to support the ELFv2 ABI on big-endian or the ELFv1 ABI on little-endian systems (and GCC does support that), and there are some special use cases for that (e.g. certain Linux kernel versions could only be built using ELFv1 on LE). This patch implements the Clang side of supporting this, based on the LLVM commit 214072. The command line options -mabi=elfv1 or -mabi=elfv2 select the desired ABI if present. (If not, Clang uses the same default rules as now.) Specifically, the patch implements the following changes based on the presence of the -mabi= option: In the driver: - Pass the appropiate -target-abi flag to the back-end - Select the correct dynamic loader version (/lib64/ld64.so.[12]) In the preprocessor: - Define _CALL_ELF to the appropriate value (1 or 2) In the compiler back-end: - Select the correct ABI in TargetInfo.cpp - Select the desired ABI for LLVM via feature (elfv1/elfv2) llvm-svn: 214074
2014-07-28 21:17:52 +08:00
// RUN: -target-abi elfv2 | FileCheck %s --check-prefix=CHECK-ELFv2
// RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -emit-llvm -o - %s \
// RUN: | FileCheck %s --check-prefix=CHECK-ELFv2
// RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -emit-llvm -o - %s \
// RUN: -target-abi elfv1 | FileCheck %s --check-prefix=CHECK-ELFv1
// RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -emit-llvm -o - %s \
// RUN: -target-abi elfv2 | FileCheck %s --check-prefix=CHECK-ELFv2
// CHECK-ELFv1: define void @func_fab(%struct.fab* noalias sret %agg.result, i64 %x.coerce)
// CHECK-ELFv2: define [2 x float] @func_fab([2 x float] %x.coerce)
struct fab { float a; float b; };
struct fab func_fab(struct fab x) { return x; }