diff options
| author | Richard Smith <richard-llvm@metafoo.co.uk> | 2018-07-31 23:35:09 +0000 |
|---|---|---|
| committer | Richard Smith <richard-llvm@metafoo.co.uk> | 2018-07-31 23:35:09 +0000 |
| commit | 0f097ac04fc21e27a382b6b896f52a12e0c02b97 (patch) | |
| tree | 28b9d60890f48a5b68bbe3bb5fafd72546339a25 /test/CodeGen | |
| parent | 13ac9b27be07334eac62b132de08677fa50b44e1 (diff) | |
[constexpr] Support for constant evaluation of __builtin_memcpy and
__builtin_memmove (in non-type-punning cases).
This is intended to permit libc++ to make std::copy etc constexpr
without sacrificing the optimization that uses memcpy on
trivially-copyable types.
__builtin_strcpy and __builtin_wcscpy are not handled by this change.
They'd be straightforward to add, but we haven't encountered a need for
them just yet.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@338455 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
| -rw-r--r-- | test/CodeGen/builtin-memfns.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/test/CodeGen/builtin-memfns.c b/test/CodeGen/builtin-memfns.c index d93a5aadae..4862677453 100644 --- a/test/CodeGen/builtin-memfns.c +++ b/test/CodeGen/builtin-memfns.c @@ -1,5 +1,8 @@ // RUN: %clang_cc1 -triple i386-pc-linux-gnu -emit-llvm < %s| FileCheck %s +typedef __WCHAR_TYPE__ wchar_t; +typedef __SIZE_TYPE__ size_t; + // CHECK: @test1 // CHECK: call void @llvm.memset.p0i8.i32 // CHECK: call void @llvm.memset.p0i8.i32 @@ -83,3 +86,17 @@ void test9() { // CHECK: call void @llvm.memcpy{{.*}} align 16 {{.*}} align 16 {{.*}} 16, i1 false) __builtin_memcpy(x, y, sizeof(y)); } + +wchar_t dest; +wchar_t src; + +// CHECK-LABEL: @test10 +// FIXME: Consider lowering these to llvm.memcpy / llvm.memmove. +void test10() { + // CHECK: call i32* @wmemcpy(i32* @dest, i32* @src, i32 4) + __builtin_wmemcpy(&dest, &src, 4); + + // CHECK: call i32* @wmemmove(i32* @dest, i32* @src, i32 4) + __builtin_wmemmove(&dest, &src, 4); +} + |