Updated

git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1505 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

2 files changed, 43 insertions, 12 deletions

diff --git a/Changelog b/Changelog
index 7a49998..2842d3b 100644
--- a/Changelog
+++ b/Changelog
@@ -1,6 +1,21 @@
 Release 1.8
 ===========
 
+- The input language to the proved part of the compiler is no longer
+  Clight but CompCert C: a larger subset of the C language supporting
+  in particular side-effects within expressions.  The transformation
+  that pulls side effects out of expressions, formerly performed by
+  untrusted Caml code, is now fully proved in Coq.
+
+- New port targeting Intel/AMD x86 processors.  Generates 32-bit x86 code
+  using SSE2 extensions for floating-point arithmetic.  Works under
+  Linux, *BSD, MacOS X, and the Cygwin environment for Windows.
+  CompCert's compilation strategy is not a very good match for the
+  x86 architecture, therefore the performance of the generated code
+  is not as good as for the PowerPC port, but still usable.
+  (About 75% of the performance of gcc -O1 for x86, compared with
+   > 90% for PowerPC.)
+
 - More faithful semantics for volatile accesses: 
   . volatile reads and writes from a volatile global variable are treated
     like input and output system calls (respectively), bypassing
@@ -8,13 +23,11 @@ Release 1.8
   . volatile reads and writes from other locations are treated like
     regular loads and stores.
 
-- Added "fabs" (floating-point absolute value) unary operator to Clight;
-  map __builtin_fabs() to this operator.
-
-- Introduced __builtin_memcpy() and __builtin_memcpy_words, use them
+- Introduced __builtin_memcpy() and __builtin_memcpy_words(), use them
   instead of memcpy() to compile struct and union assignments.
 
-- Better instruction selection for "globvar[expr + cst]" memory accesses.
+- Introduced __builtin_annotation() to transmit assertions from
+  the source program all the way to the generated assembly code.
 
 - Elimination of some useless casts around "&", "|" and "^" bitwise operators.
 
@@ -22,11 +35,14 @@ Release 1.8
   rest of compilation and slightly improves the result of register
   allocation when register pressure is high.
 
-- Implemented a spilling heuristic during register allocation.
-  This heuristic reduces significantly the amount of spill code
-  generated when register pressure is high.
+- Improvements in register allocation:
+  . Implemented a spilling heuristic during register allocation.
+    This heuristic reduces significantly the amount of spill code
+    generated when register pressure is high.
+  . More coalescing between low-pressure and high-pressure variables.
+  . Aggressive coalescing between pairs of spilled variables.
 
-- Implemented aggressive coalescing between pairs of spilled variables.
+- Fixed some bugs in the emulation of bit fields.
 
 	
 Release 1.7.1, 2010-04-13
diff --git a/README b/README
index 44a845e..29cd47f 100644
--- a/README
+++ b/README
@@ -39,6 +39,9 @@ SUPPORTED PLATFORMS:
 - ARM / Linux       [experimental]
    For ARM machines running the Linux operating system.
 
+- IA32 / Linux, BSD, MacOS  [experimental]
+   For Intel/AMD x86 processors with SSE2 extensions
+   (i.e. Pentium 4 and later).  
 
 PREREQUISITES:
 
@@ -46,7 +49,7 @@ PREREQUISITES:
   the search path.  For MacOS X, you can get them by installing the
   XCode development tools, as found on the installation DVDs.
 
-* The Coq proof assistant, version 8.2-1 or later.
+* The Coq proof assistant, version 8.2pl1 or 8.2pl2.
   Coq is free software, available from http://coq.inria.fr/
 
 * The Caml functional language, version 3.10 or later.
@@ -64,6 +67,9 @@ where <target> is one of:
             ppc-macosx       (PowerPC, MacOS X)
             ppc-linux        (PowerPC, Linux)
             arm-linux        (ARM, Linux)
+            ia32-linux       (x86 SSE2 32 bits, Linux)
+            ia32-bsd         (x86 SSE2 32 bits, BSD)
+            ia32-macosx      (x86 SSE2 32 bits, MacOS X)
 
 This generates the Makefile.config file in the top directory.
 
@@ -74,6 +80,7 @@ The "configure" script accepts the following options:
 
 -libdir <dir>                   (default: /usr/local/lib/compcert)
         Directory where the Compcert support library will be installed
+        (needed only under MacOS X)
 
 -prefix <dir>                   (default: /usr/local)
         Set bindir and libdir to
@@ -143,7 +150,7 @@ Preprocessing options:
   -U<symb>       Undefine preprocessor symbol
 Language support options (use -fno-<opt> to turn off -f<opt>) :
   -fbitfields    Emulate bit fields in structs [off]
-  -flonglong     Treat 'long long' as 'long' and 'long double' as 'double' [off]
+  -flonglong     Partial emulation of 'long long' types [on]
   -fstruct-passing  Emulate passing structs and unions by value [off]
   -fstruct-assign   Emulate assignment between structs or unions [off]
   -fvararg-calls Emulate calls to variable-argument functions [on]
@@ -153,14 +160,22 @@ Code generation options:
   -fsmall-const <n>  Set maximal size <n> for allocation in small constant area
 Tracing options:
   -dparse        Save C file after parsing and elaboration in <file>.parse.c
+  -dc            Save generated Compcert C in <file>.compcert.c
   -dclight       Save generated Clight in <file>.light.c
+  -dcminor       Save generated Cminor in <file>.cm
+  -drtl          Save unoptimized generated RTL in <file>.rtl
+  -dtailcall     Save RTL after tail call optimization in <file>.tailcall.rtl
+  -dcastopt      Save RTL after cast optimization in <file>.castopt.rtl
+  -dconstprop    Save RTL after constant propagation in <file>.constprop.rtl
+  -dcse          Save RTL after CSE optimization in <file>.cse.rtl
+  -dalloc        Save LTL after register allocation in <file>.alloc.ltl
   -dasm          Save generated assembly in <file>.s
 Linking options:
   -l<lib>        Link library <lib>
   -L<dir>        Add <dir> to search path for libraries
   -o <file>      Generate executable in <file> (default: a.out)
 General options:
-  -stdlib <dir>  Set the path of the Compcert run-time library
+  -stdlib <dir>  Set the path of the Compcert stdlib wrappers
   -v             Print external commands before invoking them