Sanjay Patel 09f3b5ecb1 [CGP] form usub with overflow from sub+icmp ...

The motivating x86 cases for forming the intrinsic are shown in PR31754 and PR40487:
https://bugs.llvm.org/show_bug.cgi?id=31754
https://bugs.llvm.org/show_bug.cgi?id=40487
..and those are shown in the IR test file and x86 codegen file.

Matching the usubo pattern is harder than uaddo because we have 2 independent values rather than a def-use.

This adds a TLI hook that should preserve the existing behavior for uaddo formation, but disables usubo
formation by default. Only x86 overrides that setting for now although other targets will likely benefit
by forming usbuo too.

Differential Revision: https://reviews.llvm.org/D57789

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354298 91177308-0d34-0410-b5e6-96231b3b80d8

2019-02-18 23:33:05 +00:00

..

AArch64

[CGP] Add support for sinking operands to their users, if they are free.

2019-02-05 10:27:40 +00:00

AMDGPU

AMDGPU: Fix tests using old number for constant address space

2018-09-10 02:54:25 +00:00

ARM

Remove irrelevant references to legacy git repositories from

2019-01-15 16:18:52 +00:00

Mips

[CodeGenPrepare] Check that erased sunken address are not reused

2017-11-24 16:45:28 +00:00

NVPTX

[BypassSlowDivision] Improve our handling of divisions by constants

2017-12-04 19:21:58 +00:00

X86

[CGP] form usub with overflow from sub+icmp

2019-02-18 23:33:05 +00:00

2008-11-24-RAUW-Self.ll

Change tests from "opt %s" to "opt < %s" so that opt doesn't see the

2009-09-11 18:01:28 +00:00

basic.ll

Add a 'dynamic' parameter to the objectsize intrinsic

2019-01-30 20:34:35 +00:00

bitreverse-hang.ll

Remove irrelevant references to legacy git repositories from

2019-01-15 16:18:52 +00:00

builtin-condition.ll

Add address space mangling to lifetime intrinsics

2017-04-10 20:18:21 +00:00

crash-on-large-allocas.ll

Add a 'dynamic' parameter to the objectsize intrinsic

2019-01-30 20:34:35 +00:00

dom-tree.ll

Remove irrelevant references to legacy git repositories from

2019-01-15 16:18:52 +00:00

gep-unmerging.ll

Unmerge GEPs to reduce register pressure on IndirectBr edges.

2017-09-11 17:52:08 +00:00

invariant.group.ll

Implement strip.invariant.group

2018-07-02 04:49:30 +00:00

nonintegral.ll

[CodeGenPrepare] Don't create inttoptr for ni ptrs

2017-06-29 20:28:59 +00:00

section-samplepgo.ll

[SampleFDO] handle ProfileSampleAccurate when initializing function entry count

2018-12-13 21:51:42 +00:00

section.ll

[PGO] Function section hotness prefix should look at all blocks

2017-12-20 17:53:10 +00:00

sink-shift-and-trunc.ll

[CodeGenPrepare] Preserve debug locs in OptimizeExtractBits

2018-09-15 04:08:52 +00:00

skip-merging-case-block.ll

Revert "[CGP] Merge empty case blocks if no extra moves are added."

2017-10-27 00:35:18 +00:00

split-indirect-loop.ll

[CodeGenPrepare] Fix crash due to an invalid CFG

2017-04-17 19:11:04 +00:00

statepoint-relocate.ll

[CGP] Fix the rematerialization of gc.relocates

2017-08-17 05:48:30 +00:00

widenable-condition.ll

Lower widenable_conditions in CGP

2019-01-31 18:45:46 +00:00