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GodeGen, NFC: Add test to track emitStoresForConstant behavior 

Reviewers: eugenis, pcc

Reviewed By: eugenis

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64385

llvm-svn: 365706
This commit is contained in:
Vitaly Buka 2019-07-10 22:47:07 +00:00
parent 1c327c7e0a
commit e26398849d
1 changed files with 66 additions and 0 deletions
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66
clang/test/CodeGen/init-memset.c Normal file
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -O0 -emit-llvm -o - %s | FileCheck %s
void use(void *);
void test_small() {
// CHECK-LABEL: define void @test_small()
int a[] = {1, 2, 3, 4};
// CHECK: call void @llvm.memcpy.{{.*}}
use(a);
}
void test_small_same() {
// CHECK-LABEL: define void @test_small_same()
char a[] = {'a', 'a', 'a', 'a'};
// CHECK: call void @llvm.memcpy.{{.*}}
use(a);
}
void test_different() {
// CHECK-LABEL: define void @test_different()
int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
// CHECK: call void @llvm.memcpy.{{.*}}
use(a);
}
void test_all_zeros() {
// CHECK-LABEL: define void @test_all_zeros()
int a[16] = {};
// CHECK: call void @llvm.memset.{{.*}}
use(a);
}
void test_all_a() {
// CHECK-LABEL: define void @test_all_a()
char a[] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
// CHECK: call void @llvm.memcpy.{{.*}}
use(a);
}
void test_most_zeros() {
// CHECK-LABEL: define void @test_most_zeros()
int a[16] = {0, 0, 1};
// CHECK: call void @llvm.memset.{{.*}}
// CHECK: store i32 1
use(a);
}
void test_most_a() {
// CHECK-LABEL: define void @test_most_a()
char a[] = "aaaaazaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
// CHECK: call void @llvm.memcpy.{{.*}}
use(a);
}
void test_pointers() {
// CHECK-LABEL: define void @test_pointers()
void *a[] = {&use, &use, &use, &use, &use, &use};
// CHECK: call void @llvm.memset.{{.*}}
// CHECK: store i8*
// CHECK: store i8*
// CHECK: store i8*
// CHECK: store i8*
// CHECK: store i8*
// CHECK: store i8*
use(a);
}