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| author | Patrick Palka <ppalka@redhat.com> | 2021-11-16 12:23:27 -0500 |
|---|---|---|
| committer | Patrick Palka <ppalka@redhat.com> | 2021-11-16 12:23:27 -0500 |
| commit | 7461b5813126c6dbe11f0f9d06c1bd83b082111e (patch) | |
| tree | 1a6c732c6738ca146fdd3f16ab72df54f31e6f4f | |
| parent | b96e2ff9d8c56bad68b5dd10e3a601f12496ae36 (diff) | |
| download | gcc-7461b5813126c6dbe11f0f9d06c1bd83b082111e.zip gcc-7461b5813126c6dbe11f0f9d06c1bd83b082111e.tar.gz gcc-7461b5813126c6dbe11f0f9d06c1bd83b082111e.tar.bz2 | |
libstdc++: Merge latest Ryu sources
libstdc++-v3/ChangeLog:
* src/c++17/ryu/MERGE: Update the commit hash.
* src/c++17/ryu/d2s_intrinsics.h: Merge from Ryu's master
branch.
Signed-off-by: Patrick Palka <ppalka@redhat.com>
| -rw-r--r-- | libstdc++-v3/src/c++17/ryu/MERGE | 2 | ||||
| -rw-r--r-- | libstdc++-v3/src/c++17/ryu/d2s_intrinsics.h | 9 |
2 files changed, 5 insertions, 6 deletions
diff --git a/libstdc++-v3/src/c++17/ryu/MERGE b/libstdc++-v3/src/c++17/ryu/MERGE index 0ea65ad..9035502 100644 --- a/libstdc++-v3/src/c++17/ryu/MERGE +++ b/libstdc++-v3/src/c++17/ryu/MERGE @@ -1,4 +1,4 @@ -22c887c017a8512abcd4a8f6bfcdb2742829cd7d +150d0c87830756d34e76c42f7f33f811d89903a8 The first line of this file holds the git revision number of the last merge done from the master library sources. diff --git a/libstdc++-v3/src/c++17/ryu/d2s_intrinsics.h b/libstdc++-v3/src/c++17/ryu/d2s_intrinsics.h index bbac4df..e3206b5 100644 --- a/libstdc++-v3/src/c++17/ryu/d2s_intrinsics.h +++ b/libstdc++-v3/src/c++17/ryu/d2s_intrinsics.h @@ -181,15 +181,14 @@ static inline uint32_t mod1e9(const uint64_t x) { #endif // defined(RYU_32_BIT_PLATFORM) static inline uint32_t pow5Factor(uint64_t value) { + const uint64_t m_inv_5 = 14757395258967641293u; // 5 * m_inv_5 = 1 (mod 2^64) + const uint64_t n_div_5 = 3689348814741910323u; // #{ n | n = 0 (mod 2^64) } = 2^64 / 5 uint32_t count = 0; for (;;) { assert(value != 0); - const uint64_t q = div5(value); - const uint32_t r = ((uint32_t) value) - 5 * ((uint32_t) q); - if (r != 0) { + value *= m_inv_5; + if (value > n_div_5) break; - } - value = q; ++count; } return count; |