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llvm-project/clang/test/CodeGen/target-avx-abi-diag.c

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Implement AVX ABI Warning/error The x86-64 "avx" feature changes how >128 bit vector types are passed, instead of being passed in separate 128 bit registers, they can be passed in 256 bit registers. "avx512f" does the same thing, except it switches from 256 bit registers to 512 bit registers. The result of both of these is an ABI incompatibility between functions compiled with and without these features. This patch implements a warning/error pair upon an attempt to call a function that would run afoul of this. First, if a function is called that would have its ABI changed, we issue a warning. Second, if said call is made in a situation where the caller and callee are known to have different calling conventions (such as the case of 'target'), we instead issue an error. Differential Revision: https://reviews.llvm.org/D82562
2020-06-24 03:14:09 +08:00
// RUN: %clang_cc1 %s -triple=x86_64-linux-gnu -verify=no256,no512 -o - -S
// RUN: %clang_cc1 %s -triple=x86_64-linux-gnu -target-feature +avx -verify=no512 -o - -S
// RUN: %clang_cc1 %s -triple=x86_64-linux-gnu -target-feature +avx512f -verify=both -o - -S
Limit x86 test to require target to fix buildbot (from 2831a317b) The modification of the features apparently requires the backend to be instantiated, so make sure this is required to fix the ARM build bots.
2020-07-01 22:34:25 +08:00
// REQUIRES: x86-registered-target
Implement AVX ABI Warning/error The x86-64 "avx" feature changes how >128 bit vector types are passed, instead of being passed in separate 128 bit registers, they can be passed in 256 bit registers. "avx512f" does the same thing, except it switches from 256 bit registers to 512 bit registers. The result of both of these is an ABI incompatibility between functions compiled with and without these features. This patch implements a warning/error pair upon an attempt to call a function that would run afoul of this. First, if a function is called that would have its ABI changed, we issue a warning. Second, if said call is made in a situation where the caller and callee are known to have different calling conventions (such as the case of 'target'), we instead issue an error. Differential Revision: https://reviews.llvm.org/D82562
2020-06-24 03:14:09 +08:00
// both-no-diagnostics
typedef short avx512fType __attribute__((vector_size(64)));
typedef short avx256Type __attribute__((vector_size(32)));
__attribute__((target("avx"))) void takesAvx256(avx256Type t);
__attribute__((target("avx512f"))) void takesAvx512(avx512fType t);
void takesAvx256_no_target(avx256Type t);
void takesAvx512_no_target(avx512fType t);
void variadic(int i, ...);
__attribute__((target("avx512f"))) void variadic_err(int i, ...);
// If neither side has an attribute, warn.
void call_warn(void) {
avx256Type t1;
takesAvx256_no_target(t1); // no256-warning {{AVX vector argument of type 'avx256Type' (vector of 16 'short' values) without 'avx' enabled changes the ABI}}
avx512fType t2;
takesAvx512_no_target(t2); // no512-warning {{AVX vector argument of type 'avx512fType' (vector of 32 'short' values) without 'avx512f' enabled changes the ABI}}
variadic(1, t1); // no256-warning {{AVX vector argument of type 'avx256Type' (vector of 16 'short' values) without 'avx' enabled changes the ABI}}
variadic(3, t2); // no512-warning {{AVX vector argument of type 'avx512fType' (vector of 32 'short' values) without 'avx512f' enabled changes the ABI}}
}
// If only 1 side has an attribute, error.
void call_errors(void) {
avx256Type t1;
takesAvx256(t1); // no256-error {{AVX vector argument of type 'avx256Type' (vector of 16 'short' values) without 'avx' enabled changes the ABI}}
avx512fType t2;
takesAvx512(t2); // no512-error {{AVX vector argument of type 'avx512fType' (vector of 32 'short' values) without 'avx512f' enabled changes the ABI}}
variadic_err(1, t1); // no256-error {{AVX vector argument of type 'avx256Type' (vector of 16 'short' values) without 'avx' enabled changes the ABI}}
variadic_err(3, t2); // no512-error {{AVX vector argument of type 'avx512fType' (vector of 32 'short' values) without 'avx512f' enabled changes the ABI}}
}
// These two don't diagnose anything, since these are valid calls.
__attribute__((target("avx"))) void call_avx256_ok(void) {
avx256Type t;
takesAvx256(t);
}
__attribute__((target("avx512f"))) void call_avx512_ok(void) {
avx512fType t;
takesAvx512(t);
}