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cppalliance / decimal Public

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Use 256 bit addition and subtraction for 128-bit decimals to avoid loss of precision #1288

Draft

mborland wants to merge 22 commits intodevelopcppalliance/decimal:developfrom

i256cppalliance/decimal:i256Copy head branch name to clipboard

Conversation Commits22 (22)Checks Files changed

Draft

Use 256 bit addition and subtraction for 128-bit decimals to avoid loss of precision #1288
mborland wants to merge 22 commits intodevelopfrom
i256

Commits

Commits on Dec 17, 2025

Add simplified u256 add impl
mborland
committed
Add intrinsic powered impl
mborland
committed
Add second u256 addition impl
mborland
committed
Add i256_sub method
mborland
committed
Add signed 256 x 256 addition
mborland
committed
Add intrinsic powered sub
mborland
committed
Add second intrin powered sub
mborland
committed
Add new decimal128_t addition impl with new paths
mborland
committed
Add compound mul operator
mborland
committed
Add operator u256 > u128
mborland
committed
Add pretty printer for u256
mborland
committed
Add proper constructor for uint128_t
mborland
committed
Add handling of double negative path
mborland
committed
Add potential fast path for non-normalized addition and subtraction
mborland
committed
Fix 256 bit powers of 10
mborland
committed
Add additional testing of pre generated powers of ten
mborland
committed
Add additional test case
mborland
committed
Use new addition method
mborland
committed
Fix pow10 generation
mborland
committed
More tests
mborland
committed
Fix missing sub borrow instrinsic
mborland
committed
Fix missing variable
mborland
committed

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