3 Commits

Author	SHA1	Message	Date
Jakob Stoklund Olesen	5ea6203ea6	Fix more register and coalescing dependencies. ... llvm-svn: 130859	2011-05-04 19:02:11 +00:00
Evan Cheng	e6d55cd247	Fix epilogue codegen to avoid leaving the stack pointer in an invalid ... state. Previously Thumb2 would restore sp from fp like this: mov sp, r7 sub, sp, #4 If an interrupt is taken after the 'mov' but before the 'sub', callee-saved registers might be clobbered by the interrupt handler. Instead, try restoring directly from sp: add sp, #4 Or, if necessary (with VLA, etc.) use a scratch register to compute sp and then restore it: sub.w r4, r7, #8 mov sp, r7 rdar://8465407 llvm-svn: 119977	2010-11-22 18:12:04 +00:00
Evan Cheng	d9a1b0d046	Re-apply r110655 with fixes. Epilogue must restore sp from fp if the function stack frame has a var-sized object. ... Also added a test case to check for the added benefit of this patch: it's optimizing away the unnecessary restore of sp from fp for some non-leaf functions. llvm-svn: 110707	2010-08-10 19:30:19 +00:00