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8 Commits

Author SHA1 Message Date
Jim Grosbach bfef309d11 Thumb1 had two patterns for the same load-from-constant-pool instruction. 
Canonicalize on tLDRpci and remove tLDRcp.

llvm-svn: 121920
 2010-12-15 23:52:36 +00:00
Evan Cheng eb56dca4fd 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
Jim Grosbach 08da771ec3 Enable pre-RA virtual frame base register allocation. rdar://8277890 
llvm-svn: 112127
 2010-08-26 00:58:06 +00:00
Evan Cheng 3f251fb26e 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
Daniel Dunbar 0dd47bfca3 Revert r110655, "Fix ARM hasFP() semantics. It should return true whenever FP 
register is", it breaks a couple test-suite tests.

llvm-svn: 110701
 2010-08-10 18:32:02 +00:00
Evan Cheng 8d5d1c1331 Fix ARM hasFP() semantics. It should return true whenever FP register is 
reserved, not available for general allocation. This eliminates all the
extra checks for Darwin.

This change also fixes the use of FP to access frame indices in leaf
functions and cleaned up some confusing code in epilogue emission.

llvm-svn: 110655
 2010-08-10 06:26:49 +00:00
Dan Gohman c8054d90fb Eliminate more uses of llvm-as and llvm-dis. 
llvm-svn: 81293
 2009-09-09 00:09:15 +00:00
Evan Cheng d76d0aa68a Move thumb and thumb2 tests into separate directories. 
llvm-svn: 74068
 2009-06-24 06:36:07 +00:00