diff options
Diffstat (limited to 'gcc/builtins.cc')
| -rw-r--r-- | gcc/builtins.cc | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/gcc/builtins.cc b/gcc/builtins.cc index 4c6c2939053..5b085e3a14f 100644 --- a/gcc/builtins.cc +++ b/gcc/builtins.cc @@ -2967,16 +2967,28 @@ expand_builtin_int_roundingfn_2 (tree exp, rtx target) BUILT_IN_IROUND and if __builtin_iround is called directly, emit a call to lround in the hope that the target provides at least some C99 functions. This should result in the best user experience for - not full C99 targets. */ - tree fallback_fndecl = mathfn_built_in_1 - (TREE_TYPE (arg), as_combined_fn (fallback_fn), 0); - - exp = build_call_nofold_loc (EXPR_LOCATION (exp), - fallback_fndecl, 1, arg); + not full C99 targets. + As scalar float conversions with same mode are useless in GIMPLE, + we can end up e.g. with _Float32 argument passed to float builtin, + try to get the type from the builtin prototype first. */ + tree fallback_fndecl = NULL_TREE; + if (tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (fndecl))) + fallback_fndecl + = mathfn_built_in_1 (TREE_VALUE (argtypes), + as_combined_fn (fallback_fn), 0); + if (fallback_fndecl == NULL_TREE) + fallback_fndecl + = mathfn_built_in_1 (TREE_TYPE (arg), + as_combined_fn (fallback_fn), 0); + if (fallback_fndecl) + { + exp = build_call_nofold_loc (EXPR_LOCATION (exp), + fallback_fndecl, 1, arg); - target = expand_call (exp, NULL_RTX, target == const0_rtx); - target = maybe_emit_group_store (target, TREE_TYPE (exp)); - return convert_to_mode (mode, target, 0); + target = expand_call (exp, NULL_RTX, target == const0_rtx); + target = maybe_emit_group_store (target, TREE_TYPE (exp)); + return convert_to_mode (mode, target, 0); + } } return expand_call (exp, target, target == const0_rtx); |