5 Commits

Author	SHA1	Message	Date
Kostya Serebryany	4007009815	Revert r195318 as it causes miscompilation (PR18029) ... llvm-svn: 195439	2013-11-22 10:30:39 +00:00
Bill Wendling	07787f8747	The basic problem is that some mainstream programs cannot deal with the way ... clang optimizes tail calls, as in this example: int foo(void); int bar(void) { return foo(); } where the call is transformed to: calll .L0$pb .L0$pb: popl %eax .Ltmp0: addl $_GLOBAL_OFFSET_TABLE_+(.Ltmp0-.L0$pb), %eax movl foo@GOT(%eax), %eax popl %ebp jmpl *%eax # TAILCALL However, the GOT references must all be resolved at dlopen() time, and so this approach cannot be used with lazy dynamic linking (e.g. using RTLD_LAZY), which usually populates the PLT with stubs that perform the actual resolving. This patch changes X86TargetLowering::LowerCall() to skip tail call optimization, if the called function is a global or external symbol. Patch by Dimitry Andric! PR15086 llvm-svn: 195318	2013-11-21 07:04:30 +00:00
Stephen Lin	f799e3f944	Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. ... This was done with the following sed invocation to catch label lines demarking function boundaries: sed -i '' "s/^;\( *\)\([A-Z0-9_]*\):\( *\)test\([A-Za-z0-9_-]*\):\( *\)$/;\1\2-LABEL:\3test\4:\5/g" test/CodeGen/*/*.ll which was written conservatively to avoid false positives rather than false negatives. I scanned through all the changes and everything looks correct. llvm-svn: 186258	2013-07-13 20:38:47 +00:00
Benjamin Kramer	5247ca0ae5	This test requires sse, otherwise x87 ops will block tailcall optimization ... llvm-svn: 138859	2011-08-31 16:49:05 +00:00
Eli Friedman	3ae39f8ad1	Fix X86TargetLowering::LowerExternalSymbol so that it actually works in non-trivial cases. This hasn't been an issue before because the function isn't normally called (but apparently is used to generate a tail-call to sin() on ELF x86-32 with PIC and SSE2). ... Fixes PR9693. llvm-svn: 137292	2011-08-11 01:48:05 +00:00