http://llvm.org/bugs/show_bug.cgi?id=8784
Summary: Optimise mov -1, reg to or
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
[Using AT&T syntax]
The code generator should consider the following transformation:
movl $-1, %eax ==> orl $-1, %eax
movq $-1, %rax ==> orq $-1, %rax
This save 2 (3) Bytes at the cost of a partial dependency on the flags and the
old register state.
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