maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[x86] add debug option for and-immediate shrinking 

The commit that added this functionality:
rL322957

may be causing/exposing a miscompile in PR38648:
https://bugs.llvm.org/show_bug.cgi?id=38648

so allow enabling/disabling to make debugging easier.

llvm-svn: 340540
This commit is contained in:
Sanjay Patel 2018-08-23 15:58:07 +00:00
parent 0d2e6251ce
commit 40aa86751a
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -41,6 +41,10 @@ using namespace llvm;
STATISTIC(NumLoadMoved, "Number of loads moved below TokenFactor");
static cl::opt<bool> AndImmShrink("x86-and-imm-shrink", cl::init(true),
cl::desc("Enable setting constant bits to reduce size of mask immediates"),
cl::Hidden);
//===----------------------------------------------------------------------===//
// Pattern Matcher Implementation
//===----------------------------------------------------------------------===//
@ -2927,7 +2931,7 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
case ISD::AND:
if (matchBEXTRFromAnd(Node))
return;
if (shrinkAndImmediate(Node))
if (AndImmShrink && shrinkAndImmediate(Node))
return;
LLVM_FALLTHROUGH;