CodeGen: Expand memory intrinsics in PreISelIntrinsicLowering

Expand large or unknown size memory intrinsics into loops in the
default lowering pipeline if the target doesn't have the corresponding
libfunc. Previously AMDGPU had a custom pass which existed to call the
expansion utilities.

With a default no-libcall option, we can remove the libfunc checks in
LoopIdiomRecognize for these, which never made any sense. This also
provides a path to lifting the immarg restriction on
llvm.memcpy.inline.

There seems to be a bug where TLI reports functions as available if
you use -march and not -mtriple.

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
index 86490c0..8ece4c7 100644
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -1088,8 +1088,8 @@ bool TargetPassConfig::addISelPasses() {
   if (TM->useEmulatedTLS())
     addPass(createLowerEmuTLSPass());
 
-  addPass(createPreISelIntrinsicLoweringPass());
   PM->add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
+  addPass(createPreISelIntrinsicLoweringPass());
   addPass(createExpandLargeDivRemPass());
   addPass(createExpandLargeFpConvertPass());
   addIRPasses();