memory: add early bail out from cpu_physical_memory_set_dirty_range
This condition is true in the common case, so we can cut out the body of the function. In addition, this makes it easier for the compiler to do at least partial inlining, even if it decides that fully inlining the function is unreasonable. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -165,6 +165,10 @@ static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
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unsigned long end, page;
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unsigned long end, page;
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unsigned long **d = ram_list.dirty_memory;
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unsigned long **d = ram_list.dirty_memory;
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if (!mask && !xen_enabled()) {
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return;
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}
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end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
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end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
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page = start >> TARGET_PAGE_BITS;
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page = start >> TARGET_PAGE_BITS;
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if (likely(mask & (1 << DIRTY_MEMORY_MIGRATION))) {
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if (likely(mask & (1 << DIRTY_MEMORY_MIGRATION))) {
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