Sanjay Patel 2c5b9e376b [ARM] don't transform an add(ext Cond), C to select unless there's a setcc of the condition ...

The transform in question claims to be doing:

// fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))

...starting in PerformADDCombineWithOperands(), but it wasn't actually checking for a setcc node
for the sext/zext patterns.

This is exactly the opposite of a transform I'd like to add to DAGCombiner's foldSelectOfConstants(),
so I was seeing infinite loops with my draft of a patch applied.

The changes in select_const.ll look positive (less instructions). The change in arm-and-tst-peephole.ll
is unrelated. We're changing the input IR in that test to preserve the intent of the test, but that's 
not affected by this code change.

Differential Revision:
https://reviews.llvm.org/D30355



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296389 91177308-0d34-0410-b5e6-96231b3b80d8

2017-02-27 21:30:54 +00:00

..

AArch64

[DAGCombine] Fix for a load combine bug with non-zero offset patterns on BE targets

2017-02-27 13:04:23 +00:00

AMDGPU

AMDGPU: Support inlineasm for packed instructions

2017-02-27 20:52:10 +00:00

ARM

[ARM] don't transform an add(ext Cond), C to select unless there's a setcc of the condition

2017-02-27 21:30:54 +00:00

AVR

[AVR] Disable integrated assembler for a few tests

2017-02-22 22:41:13 +00:00

BPF

Revert "In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled."

2017-02-26 01:27:32 +00:00

Generic

Remove an empty line in icmp-illegal.ll . NFC

2017-02-27 16:09:44 +00:00

Hexagon

[Hexagon] Undo shift folding where it could simplify addressing mode

2017-02-24 23:34:24 +00:00

Inputs

[PR27284] Reverse the ownership between DICompileUnit and DISubprogram.

2016-04-15 15:57:41 +00:00

Lanai

[lanai] Simplify small section check in LowerGlobalAddress and treat ldata sections specially.

2016-12-15 16:56:16 +00:00

Mips

Revert "In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled."

2017-02-26 01:27:32 +00:00

MIR

MIRTests: Remove unnecessary 2>&1 redirection

2017-02-22 18:47:41 +00:00

MSP430

Revert "[CGP] Split some critical edges coming out of indirect branches"

2017-02-26 11:09:12 +00:00

NVPTX

[DAGCombiner] add missing folds for scalar select of {-1,0,1}

2017-02-24 17:17:33 +00:00

PowerPC

Do full codegen for various tests. NFC

2017-02-27 01:15:57 +00:00

SPARC

Codegen: Make chains from trellis-shaped CFGs

2017-02-15 19:49:14 +00:00

SystemZ

Revert "In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled."

2017-02-26 01:27:32 +00:00

Thumb

Revert "In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled."

2017-02-26 01:27:32 +00:00

Thumb2

[ARM] Replace HasT2ExtractPack with HasDSP

2017-02-17 15:42:44 +00:00

WebAssembly

[WebAssembly] Add support for using a wasm global for the stack pointer.

2017-02-24 23:46:05 +00:00

WinEH

Avoid infinite loops in branch folding

2016-12-12 23:05:38 +00:00

X86

[X86][SSE] Attempt to extract vector elements through target shuffles

2017-02-27 21:01:57 +00:00

XCore

Revert "In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled."

2017-02-26 01:27:32 +00:00