llvm-6502/test/Transforms/GVN
Duncan P. N. Exon Smith 3fdfffbfa3 GVN: Enable value forwarding for calloc
Enable value forwarding for loads from `calloc()` without an intervening
store.

This change extends GVN to handle the following case:

    %1 = tail call noalias i8* @calloc(i64 1, i64 4)
    %2 = bitcast i8* %1 to i32*
    ; This load is trivially constant zero
    %3 = load i32* %2, align 4

This is analogous to the handling for `malloc()` in the same places.
`malloc()` returns `undef`; `calloc()` returns a zero value.  Note that
it is correct to return zero even for out of bounds GEPs since the
result of such a GEP would be undefined.

Patch by Philip Reames!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210828 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-12 21:16:19 +00:00
..
2007-07-25-DominatedLoop.ll
2007-07-25-InfiniteLoop.ll
2007-07-25-Loop.ll
2007-07-25-NestedLoop.ll
2007-07-25-SinglePredecessor.ll
2007-07-26-InterlockingLoops.ll Fix PR17952. 2013-11-11 22:00:23 +00:00
2007-07-26-NonRedundant.ll
2007-07-26-PhiErasure.ll
2007-07-30-PredIDom.ll
2007-07-31-NoDomInherit.ll
2007-07-31-RedundantPhi.ll
2008-02-12-UndefLoad.ll
2008-02-13-NewPHI.ll
2008-07-02-Unreachable.ll Fix PR17952. 2013-11-11 22:00:23 +00:00
2008-12-09-SelfRemove.ll
2008-12-12-RLE-Crash.ll
2008-12-14-rle-reanalyze.ll
2008-12-15-CacheVisited.ll
2009-01-21-SortInvalidation.ll
2009-01-22-SortInvalidation.ll
2009-02-17-LoadPRECrash.ll
2009-03-10-PREOnVoid.ll Reject alias to undefined symbols in the verifier. 2014-03-12 20:15:49 +00:00
2009-06-17-InvalidPRE.ll
2009-07-13-MemDepSortFail.ll
2009-11-12-MemDepMallocBitCast.ll
2010-03-31-RedundantPHIs.ll
2010-05-08-OneBit.ll
2010-11-13-Simplify.ll
2011-04-27-phioperands.ll
2011-06-01-NonLocalMemdepMiscompile.ll Use variable for register name in test 2013-11-10 00:57:17 +00:00
2011-07-07-MatchIntrinsicExtract.ll
2011-09-07-TypeIdFor.ll
2012-05-22-PreCrash.ll
atomic.ll
basic.ll
bitcast-of-call.ll
calloc-load-removal.ll GVN: Enable value forwarding for calloc 2014-06-12 21:16:19 +00:00
calls-nonlocal.ll
calls-readonly.ll
commute.ll
cond_br2.ll Fix PR17952. 2013-11-11 22:00:23 +00:00
cond_br.ll Fix PR17952. 2013-11-11 22:00:23 +00:00
condprop.ll
crash-no-aa.ll
crash.ll
edge.ll Catch more CHECK that can be converted to CHECK-LABEL in Transforms for easier debugging. No functionality change. 2013-07-14 01:50:49 +00:00
fpmath.ll
lifetime-simple.ll
load-constant-mem.ll
load-pre-align.ll
load-pre-licm.ll
load-pre-nonlocal.ll [GVN] Pass the phi-translated address of a load instead of the untranslated 2014-05-02 17:59:17 +00:00
local-pre.ll Fix PR17952. 2013-11-11 22:00:23 +00:00
lpre-call-wrap-2.ll
lpre-call-wrap.ll
malloc-load-removal.ll MemoryBuiltins: Reinstate optimizing (uninitialized) loads from operator new. 2013-09-24 17:34:29 +00:00
MemdepMiscompile.ll
non-local-offset.ll
nonescaping-malloc.ll
null-aliases-nothing.ll
phi-translate-partial-alias.ll
phi-translate.ll
pr10820.ll
pr12979.ll
pr14166.ll
pr17732.ll IR: Do not canonicalize constant GEPs into an out-of-bounds array access 2013-11-07 22:15:53 +00:00
pr17852.ll Add a testcase for pr17852. 2013-11-11 15:37:52 +00:00
pre-basic-add.ll
pre-compare.ll
pre-load.ll
pre-single-pred.ll
preserve-tbaa.ll TBAA: handle scalar TBAA format and struct-path aware TBAA format. 2013-09-27 18:34:27 +00:00
range.ll
readattrs.ll Catch more CHECK that can be converted to CHECK-LABEL in Transforms for easier debugging. No functionality change. 2013-07-14 01:50:49 +00:00
rle-must-alias.ll
rle-no-phi-translate.ll
rle-nonlocal.ll Fix PR17952. 2013-11-11 22:00:23 +00:00
rle-phi-translate.ll
rle-semidominated.ll Fix PR17952. 2013-11-11 22:00:23 +00:00
rle.ll Fix PR17952. 2013-11-11 22:00:23 +00:00
tbaa.ll TBAA: handle scalar TBAA format and struct-path aware TBAA format. 2013-09-27 18:34:27 +00:00
unreachable_block_infinite_loop.ll Fix broken CHECK lines. 2014-01-11 21:06:00 +00:00