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Kyle Butt 0846e56e63 Codegen: Tail-duplicate during placement. 
The tail duplication pass uses an assumed layout when making duplication
decisions. This is fine, but passes up duplication opportunities that
may arise when blocks are outlined. Because we want the updated CFG to
affect subsequent placement decisions, this change must occur during
placement.

In order to achieve this goal, TailDuplicationPass is split into a
utility class, TailDuplicator, and the pass itself. The pass delegates
nearly everything to the TailDuplicator object, except for looping over
the blocks in a function. This allows the same code to be used for tail
duplication in both places.

This change, in concert with outlining optional branches, allows
triangle shaped code to perform much better, esepecially when the
taken/untaken branches are correlated, as it creates a second spine when
the tests are small enough.

Issue from previous rollback fixed, and a new test was added for that
case as well. Issue was worklist/scheduling/taildup issue in layout.

Issue from 2nd rollback fixed, with 2 additional tests. Issue was
tail merging/loop info/tail-duplication causing issue with loops that share
a header block.

Issue with early tail-duplication of blocks that branch to a fallthrough
predecessor fixed with test case: tail-dup-branch-to-fallthrough.ll

Differential revision: https://reviews.llvm.org/D18226

llvm-svn: 283934
 		2016-10-11 20:36:43 +00:00
..
address-offsets.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
byval.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
call.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
cfg-stackify.ll Codegen: Tail-duplicate during placement. 2016-10-11 20:36:43 +00:00
cfi.ll [WebAssembly] Fix CFI index to account for padding nullptr function 2016-08-08 23:56:01 +00:00
comparisons_f32.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
comparisons_f64.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
comparisons_i32.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
comparisons_i64.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
conv.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
copysign-casts.ll [WebAssembly] Add -m:e to the target triple. 2016-01-07 03:19:23 +00:00
cpus.ll [WebAssembly] Tighten up some regexes in some tests. 2016-01-20 05:55:09 +00:00
dbgvalue.ll [WebAssembly] Trying to fix broken tests in CodeGen/WebAssembly caused by r281285. 2016-09-13 10:05:44 +00:00
dead-vreg.ll [WebAssembly] Rematerialize constants rather than hold them live in registers. 2016-01-19 16:59:23 +00:00
divrem-constant.ll [WebAssembly] Don't expand divisions by constants. 2016-05-18 14:29:42 +00:00
f32.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
f64.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
fast-isel-noreg.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
fast-isel.ll [WebAssembly] Preliminary fast-isel support. 2016-05-10 17:39:48 +00:00
frem.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
func.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
global.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
globl.ll [WebAssembly] Add -m:e to the target triple. 2016-01-07 03:19:23 +00:00
i32-load-store-alignment.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
i32.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
i64-load-store-alignment.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
i64.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
i128.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
ident.ll [WebAssembly] Add -m:e to the target triple. 2016-01-07 03:19:23 +00:00
immediates.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
indirect-import.ll [WebAssembly] Emit type signatures for declared functions 2016-06-03 18:34:36 +00:00
inline-asm.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
irreducible-cfg.ll [WebAssembly] Account for implicit operands when computing operand indices. 2016-04-26 01:40:56 +00:00
legalize.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
lit.local.cfg
…
load-ext.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
load-store-i1.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
load.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
lower-em-ehsjlj-options.ll [WebAssembly] Add asm.js-style setjmp/longjmp handling for wasm (reland r280302) 2016-09-01 21:05:15 +00:00
lower-em-exceptions-whitelist.ll [WebAssembly] Add asm.js-style setjmp/longjmp handling for wasm (reland r280302) 2016-09-01 21:05:15 +00:00
lower-em-exceptions.ll [WebAssembly] Add asm.js-style setjmp/longjmp handling for wasm (reland r280302) 2016-09-01 21:05:15 +00:00
lower-em-sjlj.ll [WebAssembly] Add asm.js-style setjmp/longjmp handling for wasm (reland r280302) 2016-09-01 21:05:15 +00:00
mem-intrinsics.ll Codegen: Tail-duplicate during placement. 2016-10-11 20:36:43 +00:00
memory-addr32.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
memory-addr64.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
negative-base-reg.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
non-executable-stack.ll [WebAssembly] Don't create a needless .note.GNU-stack section 2016-01-15 23:59:13 +00:00
offset-folding.ll [WebAssembly] Add tests for negative offsets with global variable addresses. 2016-01-25 15:19:39 +00:00
offset.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
phi.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
reg-stackify.ll [WebAssemby] Implement block signatures. 2016-10-06 22:29:32 +00:00
return-int32.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
return-void.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
returned.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
select.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
signext-zeroext.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
simd-arith.ll [WebAssembly] Initial SIMD128 support. 2016-08-02 23:16:09 +00:00
store-trunc.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
store.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
switch.ll [WebAssemby] Implement block signatures. 2016-10-06 22:29:32 +00:00
unreachable.ll [WebAssembly] Preliminary fast-isel support. 2016-05-10 17:39:48 +00:00
unused-argument.ll [WebAssembly] Optimize away return instructions using fallthroughs. 2016-05-21 00:21:56 +00:00
userstack.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
varargs.ll [WebAssembly] Remove the output operand from stores. 2016-10-06 22:08:28 +00:00
vtable.ll [WebAssembly] Add -m:e to the target triple. 2016-01-07 03:19:23 +00:00