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Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 73051de..0db0f59 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -8243,6 +8243,23 @@ when @option{-ftree-vectorize} is used. The number of iterations after vectorization needs to be greater than the value specified by this option to allow vectorization. The default value is 0. +@item gcse-cost-distance-ratio +Scaling factor in calculation of maximum distance an expression +can be moved by GCSE optimizations. This is currently supported only in +code hoisting pass. The bigger the ratio, the more agressive code hoisting +will be with simple expressions, i.e., the expressions which have cost +less than @option{gcse-unrestricted-cost}. Specifying 0 will disable +hoisting of simple expressions. The default value is 10. + +@item gcse-unrestricted-cost +Cost, roughly measured as the cost of a single typical machine +instruction, at which GCSE optimizations will not constrain +the distance an expression can travel. This is currently +supported only in code hoisting pass. The lesser the cost, +the more aggressive code hoisting will be. Specifying 0 will +allow all expressions to travel unrestricted distances. +The default value is 3. + @item max-unrolled-insns The maximum number of instructions that a loop should have if that loop is unrolled, and if the loop is unrolled, it determines how many times |