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From: | Ken Brown |
Subject: | bug#18438: 24.4.50; assertion failed in bidi.c |
Date: | Fri, 10 Oct 2014 13:14:02 -0400 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 |
On 10/10/2014 11:12 AM, Eli Zaretskii wrote:
Thanks. Although I have a question to x86_64 experts here:0x00000001004fc42b <+8>: mov %ecx,0x10(%rbp) 0x00000001004fc42e <+11>: mov 0x10(%rbp),%eax 0x00000001004fc431 <+14>: mov %rax,-0x8(%rbp)Do these 3 instructions ensure that the MSB 32 bits of RAX (and therefore the place where the result is stored at RBP+0x08) are zeroed out?
According to this, the answer is yes: http://stackoverflow.com/questions/11177137/why-do-most-x64-instructions-zero-the-upper-part-of-a-32-bit-register Ken
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