Users can write broken code that emits the same label twice with asm renaming,
detect this and emit a fatal backend error instead of aborting.

llvm-svn: 103140

llvm-svn: 103139

support a new bottom-up mode.

llvm-svn: 103138

of just letting them inherit the debug locations of adjacent instructions.

Debug info should aim to be either accurate or absent.

llvm-svn: 103135

llvm-svn: 103133

llvm-svn: 103126

llvm-svn: 103109

Teach liveintervalanalysis about virtual registers which are defined by reg_sequence instructions that are formed by registers defined by distinct instructions. e.g.
80      %reg1041:6<def> = VSHRNv4i16 %reg1034<kill>, 12, pred:14, pred:%reg0
. . .
120     %reg1041:5<def> = VSHRNv4i16 %reg1039<kill>, 12, pred:14, pred:%reg0

llvm-svn: 103102

MachineSSAUpdater to avoid duplicating all the code.

llvm-svn: 103060

Teach PHI elimination to remove REG_SEQUENCE instructions and update references of the source operands with references of the destination with subreg indices. e.g.
%reg1029<def>, %reg1030<def> = VLD1q16 %reg1024<kill>, ...
%reg1031<def> = REG_SEQUENCE %reg1029<kill>, 5, %reg1030<kill>, 6
=>
%reg1031:5<def>, %reg1031:6<def> = VLD1q16 %reg1024<kill>, ...

PHI elimination now does more than phi elimination. It is really a de-SSA pass.

llvm-svn: 103039

llvm-svn: 103013

llvm-svn: 103001

Instruction selection optimizations may have moved the def of a function argument out of the entry block. rdar://7937489

llvm-svn: 102993

llvm-svn: 102984

llvm-svn: 102981

This should make it possible to start producing kill flags in isel without
breaking stuff.

llvm-svn: 102976

in registers into a separate function to de-couple it from the
top-down-specific logic in getRegForValue.

llvm-svn: 102975

This fixes PR6941.

llvm-svn: 102970

llvm-svn: 102966

debug output is showing machine instructions, the IR-level basic block names
aren't very meaningful, and because multiple machine basic blocks may be
derived from one IR-level BB, they're also not unique.

llvm-svn: 102960

beneficial cases. See the changes in test/CodeGen/X86/tail-opts.ll and
test/CodeGen/ARM/ifcvt2.ll for details.

The fix is to change HashEndOfMBB to hash at most one instruction,
instead of trying to apply heuristics about when it will be profitable to
consider more than one instruction. The regular tail-merging heuristics
are already prepared to handle the same cases, and they're more precise.

Also, make test/CodeGen/ARM/ifcvt5.ll and
test/CodeGen/Thumb2/thumb2-branch.ll slightly more complex so that they
continue to test what they're intended to test.

And, this eliminates the problem in
test/CodeGen/Thumb2/2009-10-15-ITBlockBranch.ll, the testcase from
PR5204. Update it accordingly.

llvm-svn: 102907

preventing the emission of the NOP on Darwin for a
function with no actual code.  From timberwolfmc
with TEST=optllcdbg.

llvm-svn: 102843

when needed. This fixes PR7001

llvm-svn: 102838

handles argument lowering anyway, so there's no need for special
casing here.

llvm-svn: 102828

llvm-svn: 102826

try to put a kill flag on a DBG_INFO instruction.

llvm-svn: 102820

Seen in SingleSrc/Benchmarks/Misc/flops with TEST=optllcdbg.
7929951.

llvm-svn: 102819

llvm-svn: 102817

modified.

llvm-svn: 102816

code, and to eliminate the need for the SelectionDAGBuilder
state to be live during CodeGenAndEmitDAG calls.

Call SDB->clear() before CodeGenAndEmitDAG calls instead of
before it, and move the CurDAG->clear() out of SelectionDAGBuilder,
which doesn't own the DAG, and into CodeGenAndEmitDAG.

llvm-svn: 102814

llvm-svn: 102810

changes before doing phi lowering for switches.

llvm-svn: 102809

indexes could be of a different value type. Or not even using the same SDNode
for the constant (weird, I know). Compare the actual values instead of the
pointers.

llvm-svn: 102791

instruction selection is done; it's confusing to see parts of it printed,
while other parts are omitted, along the way.

llvm-svn: 102771

call that might throw. The landing pad assumes that all registers are in stack
slots.

We used to spill those dirty CSRs after the call, and the stack slots would be
wrong when arriving at the landing pad.

llvm-svn: 102770

llvm-svn: 102743

llvm-svn: 102742

Rounding differences causes tests to fail on Linux.

llvm-svn: 102729

comparisons sign-extended to a different bitwidth than the
comparison operands.

llvm-svn: 102721

llvm-svn: 102680