Chen Li f99bcae76f [X86ISelLowering] Add additional support for multiplication-to-shift conversion. ...

Summary: This patch adds support of conversion (mul x, 2^N + 1) => (add (shl x, N), x) and (mul x, 2^N - 1) => (sub (shl x, N), x) if the multiplication can not be converted to LEA + SHL or LEA + LEA. LLVM has already supported this on ARM, and it should also be useful on X86. Note the patch currently only applies to cases where the constant operand is positive, and I am planing to add another patch to support negative cases after this.

Reviewers: craig.topper, RKSimon

Subscribers: aemerson, llvm-commits

Differential Revision: http://reviews.llvm.org/D14603

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255415 91177308-0d34-0410-b5e6-96231b3b80d8

2015-12-12 01:04:15 +00:00

..

AArch64

[DAGCombiner] Fix PR25763 - vector comparison constant folding + sign-extension

2015-12-10 19:47:06 +00:00

AMDGPU

SelectionDAG: Match min/max if the scalar operation is legal

2015-12-11 23:16:47 +00:00

ARM

ARM: don't use a deleted node as the BaseReg in complex pattern.

2015-12-09 15:54:50 +00:00

BPF

Revert "Change memcpy/memset/memmove to have dest and source alignments."

2015-11-19 05:56:52 +00:00

CPP

Fix CPP Backend for GEP API changes for opaque pointer types

2015-09-08 18:42:29 +00:00

Generic

Move llvm/test/CodeGen/Generic/function-alias.ll to X86. It is incompatible to PECOFF.

2015-12-04 02:00:12 +00:00

Hexagon

[Hexagon] Add NewValueJump support for C4_cmpneq, C4_cmplte, C4_cmplteu

2015-12-08 16:28:32 +00:00

Inputs

DI: Reverse direction of subprogram -> function edge.

2015-11-05 22:03:56 +00:00

Mips

AsmPrinter: Use emitGlobalConstantFP to emit elements of constant data

2015-12-08 02:37:48 +00:00

MIR

Replace all weight-based interfaces in MBB with probability-based interfaces, and update all uses of old interfaces.

2015-12-01 05:29:22 +00:00

MSP430

Revert "Change memcpy/memset/memmove to have dest and source alignments."

2015-11-19 05:56:52 +00:00

NVPTX

Have a single way for creating unique value names.

2015-11-22 00:16:24 +00:00

PowerPC

Fix test/CodeGen/PowerPC/ppc-shrink-wrapping.ll after r255398

2015-12-12 00:42:05 +00:00

SPARC

Drop assert that a call with struct return goes to a function with sret

2015-10-21 20:05:01 +00:00

SystemZ

llvm/test/CodeGen/SystemZ/alloca-04.ll REQUIRES asserts due to -debug-pass.

2015-11-28 13:05:49 +00:00

Thumb

Fix ARMv4T (Thumb1) epilogue generation

2015-12-08 19:59:01 +00:00

Thumb2

Fix test case label check

2015-11-20 20:24:49 +00:00

WebAssembly

[WebAssembly] Implement prolog/epilog insertion and FrameIndex elimination

2015-12-11 23:49:46 +00:00

WinEH

[WinEH] Disable most forms of demotion

2015-11-19 23:23:33 +00:00

X86

[X86ISelLowering] Add additional support for multiplication-to-shift conversion.

2015-12-12 01:04:15 +00:00

XCore

Revert "Change memcpy/memset/memmove to have dest and source alignments."

2015-11-19 05:56:52 +00:00