[PATCH] D15946: Optimized instruction sequence for sitofp operation on X86-32

[Elena Demikhovsky via llvm-commits]

delena created this revision.
delena added a reviewer: mbodart.
delena added a subscriber: llvm-commits.
delena set the repository for this revision to rL LLVM.

Optimized 
sitofp i64 %x to double
the current sequence

 movl      %ecx, 8(%esp) 
 movl      %edx, 12(%esp) 
 fildll    8(%esp) 

replaced with 

 movd      %ecx, %xmm0 
 movd      %edx, %xmm1 
 punpckldq %xmm1, %xmm0 
 movq      %xmm0, 8(%esp)

Repository:
  rL LLVM

http://reviews.llvm.org/D15946

Files:
  ../lib/Target/X86/X86ISelLowering.cpp
  ../test/CodeGen/X86/dagcombine-cse.ll
  ../test/CodeGen/X86/scalar-int-to-fp.ll

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