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a53534a9f6
This removes unneeded zero initialization of string data.
For example, given the below code:
void Init(void *mem) {
new (mem) std::string("Hello World");
}
Assembly before:
Init(void*):
xorps xmm0, xmm0
movups xmmword ptr [rdi], xmm0
mov qword ptr [rdi + 16], 0
mov byte ptr [rdi], 22
movabs rax, 8022916924116329800
mov qword ptr [rdi + 1], rax
mov dword ptr [rdi + 8], 1684828783
mov byte ptr [rdi + 12], 0
ret
Assembly after:
Init():
mov byte ptr [rdi], 22
movabs rax, 8022916924116329800
mov qword ptr [rdi + 1], rax
mov dword ptr [rdi + 8], 1684828783
mov byte ptr [rdi + 12], 0
ret
Patch by Martijn Vels (mvels@google.com)
Reviewed as https://reviews.llvm.org/D70621
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