https://bugs.llvm.org/show_bug.cgi?id=35208
Bug ID: 35208
Summary: Hosts.cpp: calls xgetbv before detecting xsave support
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Support Libraries
Assignee: unassignedb...@nondot.org
Reporter: gonzalob...@gmail.com
CC: llvm-bugs@lists.llvm.org
In Hosts.cpp, the following code:
bool HasAVXSave = ((ECX >> 27) & 1) && ((ECX >> 28) & 1) &&
!getX86XCR0(&EAX, &EDX) && ((EAX & 0x6) == 0x6);
indirectly calls xgetbv through getX86XCR0 without checking whether the CPU
supports XSAVE before doing so. XSAVE is detected a bit after in:
// Only enable XSAVE if OS has enabled support for saving YMM state.
Features["xsave"] = HasAVXSave && (ECX >> 26) & 1;
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