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Optimization in case of small constant strings

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Patrick Pelissier committed 2021-10-24 21:48:02 +02:00
1 parent f719b2387a
commit ae6b87d646
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m-string.h
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@@ -269,6 +269,9 @@ m_str1ng_fit2size (string_t v, size_t size_alloc)
// Note: this function may be called in context where the contract // Note: this function may be called in context where the contract
// is not fullfilled. // is not fullfilled.
const size_t old_alloc = string_capacity(v); const size_t old_alloc = string_capacity(v);
// This line enables the compiler to completly remove this function
// for very short constant strings.
M_ASSUME(old_alloc >= sizeof (string_heap_ct) - 1);
if (M_UNLIKELY (size_alloc > old_alloc)) { if (M_UNLIKELY (size_alloc > old_alloc)) {
size_t alloc = size_alloc + size_alloc / 2; size_t alloc = size_alloc + size_alloc / 2;
if (M_UNLIKELY (alloc <= old_alloc)) { if (M_UNLIKELY (alloc <= old_alloc)) {