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| author | Kaveh R. Ghazi <ghazi@caip.rutgers.edu> | 2000-03-24 20:20:56 +0000 |
|---|---|---|
| committer | Kaveh Ghazi <ghazi@gcc.gnu.org> | 2000-03-24 20:20:56 +0000 |
| commit | e3a709be4d65ffbaa50949f94039f7ab7686e4f5 (patch) | |
| tree | d8a9016e5e8a7f8532c10a24cd7aaaad58cd2200 /gcc/builtins.c | |
| parent | 3424984446d90b366bddbce3dedb9235f8af280b (diff) | |
| download | gcc-e3a709be4d65ffbaa50949f94039f7ab7686e4f5.zip gcc-e3a709be4d65ffbaa50949f94039f7ab7686e4f5.tar.gz gcc-e3a709be4d65ffbaa50949f94039f7ab7686e4f5.tar.bz2 | |
builtins.c (expand_builtin_bzero): New function.
* builtins.c (expand_builtin_bzero): New function.
(expand_builtin): Handle bzero.
* builtins.def: Add BUILT_IN_BZERO.
* c-common.c (c_common_nodes_and_builtins): Provide builtin
prototype & function for bzero.
From-SVN: r32727
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index 5486552..285f4a0 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -96,6 +96,7 @@ static rtx expand_builtin_strcmp PARAMS ((tree, rtx)); static rtx expand_builtin_memcpy PARAMS ((tree)); static rtx expand_builtin_strcpy PARAMS ((tree)); static rtx expand_builtin_memset PARAMS ((tree)); +static rtx expand_builtin_bzero PARAMS ((tree)); static rtx expand_builtin_strlen PARAMS ((tree, rtx, enum machine_mode)); static rtx expand_builtin_alloca PARAMS ((tree, rtx)); @@ -1574,6 +1575,42 @@ expand_builtin_memset (exp) } } +/* Expand expression EXP, which is a call to the bzero builtin. Return 0 + if we failed the caller should emit a normal call. */ +static rtx +expand_builtin_bzero (exp) + tree exp; +{ + tree arglist = TREE_OPERAND (exp, 1); + + if (arglist == 0 + /* Arg could be non-pointer if user redeclared this fcn wrong. */ + || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE + || TREE_CHAIN (arglist) == 0 + || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) + != INTEGER_TYPE)) + return 0; + else + { + tree newarglist; + rtx result; + + /* New argument list transforming bzero(x, y) -> memset(x, 0, y). */ + newarglist = build_tree_list (NULL_TREE, TREE_VALUE (arglist)); + chainon (newarglist, build_tree_list (NULL_TREE, integer_zero_node)); + chainon (newarglist, + build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)))); + TREE_OPERAND (exp, 1) = newarglist; + + result = expand_builtin_memset(exp); + + /* Always restore the original arguments. */ + TREE_OPERAND (exp, 1) = arglist; + + return result; + } +} + #ifdef HAVE_cmpstrsi /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin. ARGLIST is the argument list for this call. Return 0 if we failed and the @@ -2313,7 +2350,7 @@ expand_builtin (exp, target, subtarget, mode, ignore) && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_MEMSET || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP - || fcode == BUILT_IN_BCMP + || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS)) return expand_call (exp, target, ignore); @@ -2451,6 +2488,12 @@ expand_builtin (exp, target, subtarget, mode, ignore) return target; break; + case BUILT_IN_BZERO: + target = expand_builtin_bzero (exp); + if (target) + return target; + break; + /* These comparison functions need an instruction that returns an actual index. An ordinary compare that just sets the condition codes is not enough. */ |