5 Commits

Author	SHA1	Message	Date
Richard Smith	ce8eca578d	Explicitly permit undefined behavior in constant initializers for global ... variables in C, in the cases where we can constant-fold it to a value regardless (such as floating-point division by zero and signed integer overflow). Strictly enforcing this rule breaks too much code. llvm-svn: 254992	2015-12-08 03:21:47 +00:00
Richard Smith	0c6124ba82	PR17381: Treat undefined behavior during expression evaluation as an unmodeled ... side-effect, so that we don't allow speculative evaluation of such expressions during code generation. This caused a diagnostic quality regression, so fix constant expression diagnostics to prefer either the first "can't be constant folded" diagnostic or the first "not a constant expression" diagnostic depending on the kind of evaluation we're doing. This was always the intent, but didn't quite work correctly before. This results in certain initializers that used to be constant initializers to no longer be; in particular, things like: float f = 1e100; are no longer accepted in C. This seems appropriate, as such constructs would lead to code being executed if sanitizers are enabled. llvm-svn: 254574	2015-12-03 01:36:22 +00:00
Stephen Lin	4362261b00	CHECK-LABEL-ify some code gen tests to improve diagnostic experience when tests fail. ... llvm-svn: 188447	2013-08-15 06:47:53 +00:00
Eli Friedman	afa84ae85b	Add missing code for compound literals of complex type. <rdar://problem/10938628> ... llvm-svn: 151549	2012-02-27 20:26:13 +00:00
Eli Friedman	6b9c41ea68	Add list initialization for complex numbers in C. Essentially, this allows "_Complex float x = {1.0f, 2.0f};". See changes to docs/LanguageExtensions.html for a longer description. ... <rdar://problem/9397672>. llvm-svn: 140090	2011-09-19 23:17:44 +00:00