234e031e36
Pessmistically assume the .align 2 before the first constpool entry adds
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two bytes padding.
llvm-svn: 33734
2007-02-01 01:09:47 +00:00
e5c19993cd
Handle an interesting corner case: the constpool_entry being reference is two
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instructions away, i.e. its address is equal to PC.
%r0 = tLDRpci <cp#0>
bx
CONSTPOOL_ENTRY 0 <cp#0>, 4
llvm-svn: 33728
2007-01-31 23:35:18 +00:00
1f3fc4b3f0
When determining whether a pc relative branch / load displacement fits in the
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instruction field, adjust it for PC value (4 for thumb, 8 for arm).
llvm-svn: 33711
2007-01-31 19:57:44 +00:00
7169bd8784
Some comments.
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llvm-svn: 33707
2007-01-31 18:29:27 +00:00
456928bbbc
ConstPool island bug: watch out for cases where UserMI is the last MI of the BB.
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llvm-svn: 33706
2007-01-31 18:19:07 +00:00
345877e77c
- Added Thumb constpool island support.
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- Islands are inserted right after the user MI since thumb LDR cannot encode
negative offset.
llvm-svn: 33690
2007-01-31 02:22:22 +00:00
7fa6964dc2
- In thumb mode, if size of MachineFunction is >= 2048, force LR to be
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spilled (if it is not already).
- If LR is spilled, use BL to implement far jumps. LR is not used as a GPR
in thumb mode so it can be clobbered if it is properly spilled / restored
in prologue / epilogue.
- If LR is force spilled but no far jump has been emitted, try undo'ing the
spill by:
push lr -> delete
pop pc -> bx lr
llvm-svn: 33650
2007-01-30 01:18:38 +00:00
760c68b8af
Factor GetInstSize() out of constpool island pass.
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llvm-svn: 33644
2007-01-29 23:45:17 +00:00
0701c5a074
Thumb jumptable support.
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llvm-svn: 33568
2007-01-27 02:29:45 +00:00
3c9dc6bd46
Conditional branch being fixed up is not the last MI in the BB, there is a
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unconditional branch following it. Simply invert the condition and swap
destinations if the conditional branch can reach the destination of the
unconditional branch:
beq L1
b L2
=>
bne L2
b L1
llvm-svn: 33548
2007-01-26 20:38:26 +00:00
f9e5445ed4
Make LABEL a builtin opcode.
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llvm-svn: 33537
2007-01-26 14:34:52 +00:00
1e270b639d
SplitBlockBeforeInstr() insert a unconditional branch to the next BB. This
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is unnecessary when we are fixing up a conditional branch since we will be
adding a unconditional branch to the destination of the original branch.
llvm-svn: 33517
2007-01-26 02:02:39 +00:00
db7f0591f3
Need to scan the function for branches even if there aren't any constants.
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llvm-svn: 33515
2007-01-26 01:04:44 +00:00
1d138989f4
Forgot to update this.
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llvm-svn: 33512
2007-01-25 23:31:04 +00:00
010ae386b8
Add comment, fix typo, reduce memory usage, etc.
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llvm-svn: 33510
2007-01-25 23:18:59 +00:00
417260dc11
Doh. Skip JT branches.
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llvm-svn: 33501
2007-01-25 19:43:52 +00:00
22c7cf504e
Added (preliminary) branch shortening capability to constantpool island pass.
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llvm-svn: 33497
2007-01-25 03:12:46 +00:00
1526ba50d9
Use PC relative ldr to load from a constantpool in Thumb mode.
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llvm-svn: 33484
2007-01-24 08:53:17 +00:00
10043e215b
ARM backend contribution from Apple.
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llvm-svn: 33353
2007-01-19 07:51:42 +00:00
Evan Cheng