diff options
Diffstat (limited to 'Changelog')
| -rw-r--r-- | Changelog | 60 |
1 files changed, 37 insertions, 23 deletions
@@ -1,3 +1,11 @@ +Release 2.4 +======================== + +Language features: +- Support C99 compound literals (ISO C99 section 6.5.2.5). +- Support "switch" statements over an argument of type "long long". + +Code generation and optimization: - Revised and improved support for single-precision floating-point arithmetic. Earlier, all FP arithmetic was performed at double precision, with conversions to/from single precision as needed, @@ -6,40 +14,46 @@ "float" are performed in single-precision, using the processor's single FP instructions. Fewer conversions between double and single precision are generated. +- Value analysis and constant propagation: more precise treatment of + comparisons against an integer constant. -- Refactored the library of FP arithmetic (lib/Floats.v) to support - both 64- and 32-bit floats. -- Some more theorems proved about float<->integer conversions. +Improvements in confidence: +- Full correctness proofs for the algorithms used in the runtime + support library for conversions between 64-bit integers and + floating-point numbers. -- ARM port: added support for Thumb2 instruction encoding (option -fthumb). +ARM port: +- Added support for Thumb2 instruction encoding (option -mthumb). Thumb2 is supported on ARMv7 and up, and produces more compact machine code. +- Exploit some VFPv3 instructions when available. +- Built-in function '__builtin_cntlz' (count leading zeros) + renamed '__builtin_clz' for GCC / Clang compatibility. +- Added built-in functions for load with reservation / store conditional. -- The memory model was extended with two new "chunks", Many32 and Many64, - that enable storing any 32-bit value or 64-bit value using - an opaque, not bit-based encoding, and reloading these values exactly. - These new chunks are used to implement saving and restoring callee-save - registers that can contain data of unknown types (e.g. float32 or float64) - but known sizes. - -- PowerPC port: refactored the expansion of built-in functions and +PowerPC port: +- Refactored the expansion of built-in functions and pseudo-instructions so that it does not need to be re-done in - cchecklink. Updated the cchecklink validator accordingly. - -- Language features: support "switch" statements over an argument of - type "long long". - -- Value analysis and constant propagation: more precise treatment of - comparisons against an integer constant. - -- Language features: support C99 compound literals. - + cchecklink. +- Updated the cchecklink validator accordingly. - Built-in function '__builtin_cntlz' (count leading zeros) renamed '__builtin_clz' for GCC / Clang compatibility. +- Added built-in functions for load with reservation / store conditional. -- IA32: added built-in functions __builtin_clz and __builtin_ctz +IA32 port: +- Added built-in functions __builtin_clz and __builtin_ctz (count leading / trailing zeros). +Coq development: +- The memory model was extended with two new "chunks", Many32 and Many64, + that enable storing any 32-bit value or 64-bit value using + an abstract, not bit-based encoding, and reloading these values exactly. + These new chunks are used to implement saving and restoring callee-save + registers that can contain data of unknown types (e.g. float32 or float64) + but known sizes. +- Refactored the library of FP arithmetic (lib/Floats.v) to support + both 64- and 32-bit floats. + Release 2.3pl2, 2014-05-15 ========================== |