[LibCallSimplifier] try harder to fold memcmp with constant arguments (2nd try)

The 1st try was reverted because it could inf-loop by creating a dead instruction.
Fixed that to not happen and added a test case to verify.

Original commit message:

Try to fold:
memcmp(X, C, ConstantLength) == 0 --> load X == *C

Without this change, we're unnecessarily checking the alignment of the constant data,
so we miss the transform in the first 2 tests in the patch.

I noted this shortcoming of LibCallSimpifier in one of the recent CGP memcmp expansion
patches. This doesn't help the example in:
https://bugs.llvm.org/show_bug.cgi?id=34032#c13
...directly, but it's worth short-circuiting more of these simple cases since we're
already trying to do that.

The benefit of transforming to load+cmp is that existing IR analysis/transforms may
further simplify that code. For example, if the load of the variable is common to
multiple memcmp calls, CSE can remove the duplicate instructions.

Differential Revision: https://reviews.llvm.org/D36922

llvm-svn: 311366

1 files changed, 30 insertions, 14 deletions

diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 8257dbcf858..37cfc2cbbc1 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -18,6 +18,7 @@
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/Triple.h"
+#include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/Analysis/OptimizationDiagnosticInfo.h"
 #include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/Analysis/ValueTracking.h"
@@ -751,29 +752,44 @@ Value *LibCallSimplifier::optimizeMemCmp(CallInst *CI, IRBuilder<> &B) {
   }
 
   // memcmp(S1,S2,N/8)==0 -> (*(intN_t*)S1 != *(intN_t*)S2)==0
+  // TODO: The case where both inputs are constants does not need to be limited
+  // to legal integers or equality comparison. See block below this.
   if (DL.isLegalInteger(Len * 8) && isOnlyUsedInZeroEqualityComparison(CI)) {
-
     IntegerType *IntType = IntegerType::get(CI->getContext(), Len * 8);
     unsigned PrefAlignment = DL.getPrefTypeAlignment(IntType);
 
-    if (getKnownAlignment(LHS, DL, CI) >= PrefAlignment &&
-        getKnownAlignment(RHS, DL, CI) >= PrefAlignment) {
-
-      Type *LHSPtrTy =
-          IntType->getPointerTo(LHS->getType()->getPointerAddressSpace());
-      Type *RHSPtrTy =
-          IntType->getPointerTo(RHS->getType()->getPointerAddressSpace());
-
-      Value *LHSV =
-          B.CreateLoad(B.CreateBitCast(LHS, LHSPtrTy, "lhsc"), "lhsv");
-      Value *RHSV =
-          B.CreateLoad(B.CreateBitCast(RHS, RHSPtrTy, "rhsc"), "rhsv");
+    // First, see if we can fold either argument to a constant.
+    Value *LHSV = nullptr;
+    if (auto *LHSC = dyn_cast<Constant>(LHS)) {
+      LHSC = ConstantExpr::getBitCast(LHSC, IntType->getPointerTo());
+      LHSV = ConstantFoldLoadFromConstPtr(LHSC, IntType, DL);
+    }
+    Value *RHSV = nullptr;
+    if (auto *RHSC = dyn_cast<Constant>(RHS)) {
+      RHSC = ConstantExpr::getBitCast(RHSC, IntType->getPointerTo());
+      RHSV = ConstantFoldLoadFromConstPtr(RHSC, IntType, DL);
+    }
 
+    // Don't generate unaligned loads. If either source is constant data,
+    // alignment doesn't matter for that source because there is no load.
+    if ((LHSV || getKnownAlignment(LHS, DL, CI) >= PrefAlignment) &&
+        (RHSV || getKnownAlignment(RHS, DL, CI) >= PrefAlignment)) {
+      if (!LHSV) {
+        Type *LHSPtrTy =
+            IntType->getPointerTo(LHS->getType()->getPointerAddressSpace());
+        LHSV = B.CreateLoad(B.CreateBitCast(LHS, LHSPtrTy), "lhsv");
+      }
+      if (!RHSV) {
+        Type *RHSPtrTy =
+            IntType->getPointerTo(RHS->getType()->getPointerAddressSpace());
+        RHSV = B.CreateLoad(B.CreateBitCast(RHS, RHSPtrTy), "rhsv");
+      }
       return B.CreateZExt(B.CreateICmpNE(LHSV, RHSV), CI->getType(), "memcmp");
     }
   }
 
-  // Constant folding: memcmp(x, y, l) -> cnst (all arguments are constant)
+  // Constant folding: memcmp(x, y, Len) -> constant (all arguments are const).
+  // TODO: This is limited to i8 arrays.
   StringRef LHSStr, RHSStr;
   if (getConstantStringInfo(LHS, LHSStr) &&
       getConstantStringInfo(RHS, RHSStr)) {