to find opportunities for store-to-load forwarding or load CSE,
in the same way that visitStore scans back to do DSE. Also, define
a new helper function for testing whether the addresses of two
memory accesses are known to have the same value, and use it in
both visitStore and visitLoad.

These two changes allow instcombine to eliminate loads in code
produced by front-ends that frequently emit obviously redundant
addressing for memory references.

llvm-svn: 57608

llvm-svn: 57515

- Renumber fcmp predicates to match their icmp counterparts.
- Try swapping operands to expose more optimization opportunities.

llvm-svn: 57513

     ord && olt -> olt
     ord && ueq -> oeq

llvm-svn: 57507

constant expression with all zero indices as being the same as a bitcast.

llvm-svn: 57442

a couple other cases for clarity, but shouldn't affect correctness.

Patch by Eli Friedman!

llvm-svn: 57387

This patch fixes PR 2869

llvm-svn: 57369

llvm-svn: 57353

and APFloat::convertToInteger.  Restore return value to
IEEE754.  Adjust all users accordingly.

llvm-svn: 57329

llvm-svn: 57320

llvm-svn: 57305

Patch by Samuel Tardieu.

llvm-svn: 57291

patch by Samuel Tardieu!

llvm-svn: 57288

llvm-svn: 57254

llvm-svn: 57221

This includes not marking a GEP involving a vector as unsafe, but only when it
has all zero indices. This allows scalarrepl to work in a few more cases.

llvm-svn: 57177

shifting and masking inside a bswap expr.  This allows it to handle
the cases from PR2842, which involve the intermediate 'or' 
expressions being shifted, not just the input value.

llvm-svn: 57095

ashr.  It should only apply to lshr.

llvm-svn: 57089

when deciding whether to mark a function readnone/readonly.
Since the pass is currently run before SROA, this may be
quite helpful.  Requested by Chris on IRC.

llvm-svn: 57050

applicable.

llvm-svn: 57033

While hosting instruction check PHI node.

llvm-svn: 57025

Why?  Because it was there!

llvm-svn: 56996

llvm-svn: 56994

pointer bitcasts and GEP's", and centralize the
logic in Value::getUnderlyingObject.  The
difference with stripPointerCasts is that
stripPointerCasts only strips GEPs if all
indices are zero, while getUnderlyingObject
strips GEPs no matter what the indices are.

llvm-svn: 56922

llvm-svn: 56917

instruction, not after. This fixes some uses of free'd memory.

llvm-svn: 56908

llvm-svn: 56887

llvm-svn: 56868

llvm-svn: 56834

huge simply connected components.  Suggested
by Chris.

llvm-svn: 56787

llvm-svn: 56786

llvm-svn: 56784

instead of hasWeakLinkage in a bunch of optimization
passes.

llvm-svn: 56782

llvm-svn: 56716

- return attributes - inreg, zext and sext
- parameter attributes
- function attributes - nounwind, readonly, readnone, noreturn

Return attributes use 0 as the index.
Function attributes use ~0U as the index.

This patch requires corresponding changes in llvm-gcc and clang.

llvm-svn: 56704

s/ParamAttr/Attribute/g
s/PAList/AttrList/g
s/FnAttributeWithIndex/AttributeWithIndex/g
s/FnAttr/Attribute/g

This sets the stage 
- to implement function notes as function attributes and 
- to distinguish between function attributes and return value attributes.

This requires corresponding changes in llvm-gcc and clang.

llvm-svn: 56622

llvm-svn: 56549

llvm-svn: 56546

llvm-svn: 56535

llvm-svn: 56527