llvm-svn: 137913

Dramatically speedup codegen prepare by a) avoiding use of dominator tree and b) doing a separate pass over dbg.value instructions.

llvm-svn: 137908

llvm-svn: 137902

llvm-svn: 137900

llvm-svn: 137898

llvm-svn: 137897

llvm-svn: 137895

llvm-svn: 137892

llvm-svn: 137891

llvm-svn: 137890

llvm-svn: 137889

llvm-svn: 137888

shift amount is variable

llvm-svn: 137885

llvm-svn: 137881

The landingpad instruction is lowered into the EXCEPTIONADDR and EHSELECTION
SDNodes. The information from the landingpad instruction is harvested by the
'AddLandingPadInfo' function. The new EH uses the current EH scheme in the
back-end. This will change once we switch over to the new scheme. (Reviewed by
Jakob!)

llvm-svn: 137880

Represent the operand value as it will be encoded in the instruction. This
allows removing the specialized encoder and decoder methods entirely. Add
an assembler match class while we're at it to lay groundwork for parsing the
thumb shift instructions.

llvm-svn: 137879

PRE needs the landing pads to have their critical edges split. Doing this for a
landing pad is non-trivial. Abandon the attempt to perform PRE when we come
across a landing pad. (Reviewed by Owen!)

llvm-svn: 137876

llvm-svn: 137875

This generates the SDNodes for the new exception handling scheme. It takes the
two values coming from the landingpad instruction and assigns them to the
EXCEPTIONADDR and EHSELECTION nodes.

llvm-svn: 137873

llvm-svn: 137872

One way to exit the loop is through an unwind edge. However, that may involve
splitting the critical edge of the landing pad, which is non-trivial. Prevent
the transformation from rewriting the landing pad exit loop block.

llvm-svn: 137871

so requires more care than this generic algorithm should handle.

llvm-svn: 137866

llvm-svn: 137865

llvm-svn: 137864

instruction should be marked as potentially reading and/or writing memory.

llvm-svn: 137863

llvm-svn: 137861

llvm-svn: 137857

llvm-svn: 137856

Things are much saner now. We no longer need to modify the laning pads, because
of the invariants we impose upon them. The only thing DwarfEHPrepare needs to do
is convert the 'resume' instruction into a call to '_Unwind_Resume'.

llvm-svn: 137855

llvm-svn: 137854

Revert r137781; I agree with Duncan's comment that the situation in question is clearly impossible given the current structure of the code.

llvm-svn: 137853

llvm-svn: 137848

llvm-svn: 137847

llvm-svn: 137846

llvm-svn: 137845

llvm-svn: 137844

llvm-svn: 137843

Don't use NULL to represent an invalid library; Cygwin uses this for RTLD_DEFAULT. Caught by Takumi.

llvm-svn: 137841

llvm-svn: 137840

llvm-svn: 137838