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Share the testing code for built-in functions that are available on
all target platforms.
Improve testing of __builtin_clz* and __builtin_ctz*
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Now that some builtin functions have known semantics, constant
propagation can happen in this test. This defeats the purpose,
which is to check that the correct processor instructions are generated.
To prevent this constant propagation, we move the initialized
variables to global scope. Since they are not "const", their
values are not known to the optimizer.
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Here are two examples that cause an internal error in Asmexpand.ml:
volatile long long x; void f(unsigned int i) { x = i; }
unsigned g(unsigned i) { return __builtin_clzll(i); }
The argument "i" to builtin volatile store or __builtin_clzll is turned into a BA_splitlong(BA_int 0, BA <variable i>), which Asmexpand.ml doesn't know how to handle.
The fix (in AST.builtin_arg_ok) is to prevent this 'optimization' for all builtins except those of the "OK_all" kind, i.e. __builtin_annot.
Regression tests were added and tested on IA32. Need to retest on ARM and PowerPC.
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ARM: add __builtin_clzl, __builtin_clzll
IA32: add __builtin_clzl, __builtin_clzll,
__builtin_ctzl, __builtin_ctzll
Add corresponding tests in tests/regression/
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In RTL and beyond, the result of a builtin function that has return type different from "void" must be BR, never BR_none. Otherwise, we get compile-time fatal errors, either in Asmexpand or in Lineartyping.
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IA32: add __builtin_clz, __builtin_ctz.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2619 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
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enabling more aggressive optimizations.
- Less aggressive CSE for EF_builtin builtins, causes problems
for __builtin_write{16,32}_reversed.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2363 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
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for compatibility with earlier CompCert versions.
But don't use them in PackedStructs.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2216 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
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Remove __builtin_{read,write}_reversed from IA32 and ARM ports.
Machregs: tighten destroyed_by_builtin
Packedstructs: use bswap if read/write-reversed not available.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2208 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
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