Short-cut generation of simple built-in functions
commitae62deea323fb8805fe61b9743829db678843f0b
authorrsandifo <rsandifo@138bc75d-0d04-0410-961f-82ee72b054a4>
Tue, 17 Nov 2015 18:51:20 +0000 (17 18:51 +0000)
committerrsandifo <rsandifo@138bc75d-0d04-0410-961f-82ee72b054a4>
Tue, 17 Nov 2015 18:51:20 +0000 (17 18:51 +0000)
tree380228f624ddb3beca125c6b95fe59b5947f3faf
parentff690865f1bd81b60e0479701db3ac0303d2fef2
Short-cut generation of simple built-in functions

This patch short-circuits the builtins.c expansion code for a particular
gimple call if:

- the function has an associated internal function
- the target implements that internal function
- the call has no side effects

This allows a later patch to remove the builtins.c code, once calls with
side effects have been handled.

Tested on x86_64-linux-gnu, aarch64-linux-gnu and arm-linux-gnueabi.

gcc/
* builtins.h (called_as_built_in): Declare.
* builtins.c (called_as_built_in): Make external.
* internal-fn.h (expand_internal_call): Define a variant that
specifies the internal function explicitly.
* internal-fn.c (expand_load_lanes_optab_fn)
(expand_store_lanes_optab_fn, expand_ANNOTATE, expand_GOMP_SIMD_LANE)
(expand_GOMP_SIMD_VF, expand_GOMP_SIMD_LAST_LANE)
(expand_GOMP_SIMD_ORDERED_START, expand_GOMP_SIMD_ORDERED_END)
(expand_UBSAN_NULL, expand_UBSAN_BOUNDS, expand_UBSAN_VPTR)
(expand_UBSAN_OBJECT_SIZE, expand_ASAN_CHECK, expand_TSAN_FUNC_EXIT)
(expand_UBSAN_CHECK_ADD, expand_UBSAN_CHECK_SUB)
(expand_UBSAN_CHECK_MUL, expand_ADD_OVERFLOW, expand_SUB_OVERFLOW)
(expand_MUL_OVERFLOW, expand_LOOP_VECTORIZED)
(expand_mask_load_optab_fn, expand_mask_store_optab_fn)
(expand_ABNORMAL_DISPATCHER, expand_BUILTIN_EXPECT, expand_VA_ARG)
(expand_UNIQUE, expand_GOACC_DIM_SIZE, expand_GOACC_DIM_POS)
(expand_GOACC_LOOP, expand_GOACC_REDUCTION, expand_direct_optab_fn)
(expand_unary_optab_fn, expand_binary_optab_fn): Add an internal_fn
argument.
(internal_fn_expanders): Update prototype.
(expand_internal_call): Define a variant that specifies the
internal function explicitly. Use it to implement the previous
interface.
* cfgexpand.c (expand_call_stmt): Try to expand calls to built-in
functions as calls to internal functions.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@230487 138bc75d-0d04-0410-961f-82ee72b054a4
gcc/ChangeLog
gcc/builtins.c
gcc/builtins.h
gcc/cfgexpand.c
gcc/internal-fn.c
gcc/internal-fn.h