optimising compiler การใช้

• In spite of the aforementioned difficulties, IBM produced its PL / I optimising compiler in 1971.
• These conversions are required by asm . js, so that an optimising compiler can produce highly efficient native code ahead-of-time.
• If range of the required result is greater than the range of operands, this normally produces slow inefficient code, even from a good optimising compiler.
• In such an optimising compiler, no conversions are performed when asm . js code calls other asm . js code, as the required type specifiers mean it is guaranteed that values will already have the correct type.
• Their disadvantages include the need for multiple chained pointer indirections to access an element, and the extra work required to determine the next row in an " n "-dimensional array to allow an optimising compiler to prefetch it.