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Author SHA1 Message Date
Zvi Rackover 839d15a194 [X86] Optimization for replacing LEA with MOV at frame index elimination time 
Summary:
Replace a LEA instruction of the form 'lea (%esp), %ebx' --> 'mov %esp, %ebx'

MOV is preferable over LEA because usually there are more issue-slots available to execute MOVs than LEAs. Latest processors also support zero-latency MOVs.

Fixes pr29022.

Reviewers: hfinkel, delena, igorb, myatsina, mkuper

Differential Revision: https://reviews.llvm.org/D24705

llvm-svn: 282385
 2016-09-26 06:42:07 +00:00
Andrey Turetskiy b405606432 [X86] PR27502: Fix the LEA optimization pass. 
Handle MachineBasicBlock as a memory displacement operand in the LEA optimization pass.

Differential Revision: http://reviews.llvm.org/D19409

llvm-svn: 267551
 2016-04-26 12:18:12 +00:00