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| author | Marc Mutz <marc.mutz@qt.io> | 2022-09-08 16:46:13 +0200 |
|---|---|---|
| committer | Marc Mutz <marc.mutz@qt.io> | 2022-09-12 12:37:42 +0200 |
| commit | 4b5b87c27b803c5bf0fed96c381c5e343b28d419 (patch) | |
| tree | 8682e5b16666a716e59d8352824b9e9ddac2f412 /src/corelib/global/qnumeric.h | |
| parent | 542f837fa2bc5d6009e966c7fa9d7909cef22d2d (diff) | |
Specialize qMulOverflow<2>(n) as qAddOverflow(n, n)
Addition is always more efficient than multiplication.
Pick-to: 6.4
Task-number: QTBUG-104972
Change-Id: Ib945e7df88562a2f4aea00aa319ff837191b8df2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Diffstat (limited to 'src/corelib/global/qnumeric.h')
| -rw-r--r-- | src/corelib/global/qnumeric.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/corelib/global/qnumeric.h b/src/corelib/global/qnumeric.h index 9ecbbc712a..7779c03515 100644 --- a/src/corelib/global/qnumeric.h +++ b/src/corelib/global/qnumeric.h @@ -317,6 +317,8 @@ template <typename T, T V2> bool qMulOverflow(T v1, std::integral_constant<T, V2 template <auto V2, typename T> bool qMulOverflow(T v1, T *r) { + if constexpr (V2 == 2) + return qAddOverflow(v1, v1, r); return qMulOverflow(v1, std::integral_constant<T, V2>{}, r); } |