5 Commits

Author	SHA1	Message	Date
Evan Cheng	ab5c703fdb	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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119977 91177308-0d34-0410-b5e6-96231b3b80d8	2010-11-22 18:12:04 +00:00
Rafael Espindola	2ebb4f81f7	Remove the arm_aapcscc marker from the tests. It is the default ... for the linux targets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106029 91177308-0d34-0410-b5e6-96231b3b80d8	2010-06-15 19:04:29 +00:00
Evan Cheng	2ef9c8a43d	More consistent thumb1 asm printing. ... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89328 91177308-0d34-0410-b5e6-96231b3b80d8	2009-11-19 06:57:41 +00:00
Dan Gohman	fce288fc91	Eliminate more uses of llvm-as and llvm-dis. ... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81293 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-09 00:09:15 +00:00
Evan Cheng	861986401e	It turns out most of the thumb2 instructions are not allowed to touch SP. The semantics of such instructions are unpredictable. We have just been lucky that tests have been passing. ... This patch takes pain to ensure all the PEI lowering code does the right thing when lowering frame indices, insert code to manipulate stack pointers, etc. It's also custom lowering dynamic stack alloc into pseudo instructions so we can insert the right instructions at scheduling time. This fixes PR4659 and PR4682. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78361 91177308-0d34-0410-b5e6-96231b3b80d8	2009-08-07 00:34:42 +00:00