On 30.09.21 14:40, Jan Beulich via Virtualization wrote:
While using a plain (constant) address works, its use needlessly invokes a SIB addressing mode, making every call site one byte larger than necessary. Instead of using an "i" constraint with address-of operator and a 'c' operand modifier, simply use an ordinary "m" constraint, which the 64-bit compiler will translate to %rip-relative addressing. This way we also tell the compiler the truth about operand usage - the memory location gets actually read, after all. 32-bit code generation is unaffected by the change. Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx> Juergen
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