r323362 - IRGen: Emit an inline implementation of __builtin_wmemcmp on MSVCRT platforms.
Peter Collingbourne via cfe-commits
cfe-commits at lists.llvm.org
Wed Jan 24 10:59:59 PST 2018
Author: pcc
Date: Wed Jan 24 10:59:58 2018
New Revision: 323362
URL: http://llvm.org/viewvc/llvm-project?rev=323362&view=rev
Log:
IRGen: Emit an inline implementation of __builtin_wmemcmp on MSVCRT platforms.
The MSVC runtime library does not provide a definition of wmemcmp,
so we need an inline implementation.
Differential Revision: https://reviews.llvm.org/D42441
Added:
cfe/trunk/test/CodeGen/wmemcmp.c
Modified:
cfe/trunk/lib/CodeGen/CGBuiltin.cpp
Modified: cfe/trunk/lib/CodeGen/CGBuiltin.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGBuiltin.cpp?rev=323362&r1=323361&r2=323362&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGBuiltin.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGBuiltin.cpp Wed Jan 24 10:59:58 2018
@@ -1741,6 +1741,63 @@ RValue CodeGenFunction::EmitBuiltinExpr(
Builder.CreateMemSet(Dest, ByteVal, SizeVal, false);
return RValue::get(Dest.getPointer());
}
+ case Builtin::BI__builtin_wmemcmp: {
+ // The MSVC runtime library does not provide a definition of wmemcmp, so we
+ // need an inline implementation.
+ if (!getTarget().getTriple().isOSMSVCRT())
+ break;
+
+ llvm::Type *WCharTy = ConvertType(getContext().WCharTy);
+
+ Value *Dst = EmitScalarExpr(E->getArg(0));
+ Value *Src = EmitScalarExpr(E->getArg(1));
+ Value *Size = EmitScalarExpr(E->getArg(2));
+
+ BasicBlock *Entry = Builder.GetInsertBlock();
+ BasicBlock *CmpGT = createBasicBlock("wmemcmp.gt");
+ BasicBlock *CmpLT = createBasicBlock("wmemcmp.lt");
+ BasicBlock *Next = createBasicBlock("wmemcmp.next");
+ BasicBlock *Exit = createBasicBlock("wmemcmp.exit");
+ Value *SizeEq0 = Builder.CreateICmpEQ(Size, ConstantInt::get(SizeTy, 0));
+ Builder.CreateCondBr(SizeEq0, Exit, CmpGT);
+
+ EmitBlock(CmpGT);
+ PHINode *DstPhi = Builder.CreatePHI(Dst->getType(), 2);
+ DstPhi->addIncoming(Dst, Entry);
+ PHINode *SrcPhi = Builder.CreatePHI(Src->getType(), 2);
+ SrcPhi->addIncoming(Src, Entry);
+ PHINode *SizePhi = Builder.CreatePHI(SizeTy, 2);
+ SizePhi->addIncoming(Size, Entry);
+ CharUnits WCharAlign =
+ getContext().getTypeAlignInChars(getContext().WCharTy);
+ Value *DstCh = Builder.CreateAlignedLoad(WCharTy, DstPhi, WCharAlign);
+ Value *SrcCh = Builder.CreateAlignedLoad(WCharTy, SrcPhi, WCharAlign);
+ Value *DstGtSrc = Builder.CreateICmpUGT(DstCh, SrcCh);
+ Builder.CreateCondBr(DstGtSrc, Exit, CmpLT);
+
+ EmitBlock(CmpLT);
+ Value *DstLtSrc = Builder.CreateICmpULT(DstCh, SrcCh);
+ Builder.CreateCondBr(DstLtSrc, Exit, Next);
+
+ EmitBlock(Next);
+ Value *NextDst = Builder.CreateConstInBoundsGEP1_32(WCharTy, DstPhi, 1);
+ Value *NextSrc = Builder.CreateConstInBoundsGEP1_32(WCharTy, SrcPhi, 1);
+ Value *NextSize = Builder.CreateSub(SizePhi, ConstantInt::get(SizeTy, 1));
+ Value *NextSizeEq0 =
+ Builder.CreateICmpEQ(NextSize, ConstantInt::get(SizeTy, 0));
+ Builder.CreateCondBr(NextSizeEq0, Exit, CmpGT);
+ DstPhi->addIncoming(NextDst, Next);
+ SrcPhi->addIncoming(NextSrc, Next);
+ SizePhi->addIncoming(NextSize, Next);
+
+ EmitBlock(Exit);
+ PHINode *Ret = Builder.CreatePHI(IntTy, 4);
+ Ret->addIncoming(ConstantInt::get(IntTy, 0), Entry);
+ Ret->addIncoming(ConstantInt::get(IntTy, 1), CmpGT);
+ Ret->addIncoming(ConstantInt::get(IntTy, -1), CmpLT);
+ Ret->addIncoming(ConstantInt::get(IntTy, 0), Next);
+ return RValue::get(Ret);
+ }
case Builtin::BI__builtin_dwarf_cfa: {
// The offset in bytes from the first argument to the CFA.
//
Added: cfe/trunk/test/CodeGen/wmemcmp.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/wmemcmp.c?rev=323362&view=auto
==============================================================================
--- cfe/trunk/test/CodeGen/wmemcmp.c (added)
+++ cfe/trunk/test/CodeGen/wmemcmp.c Wed Jan 24 10:59:58 2018
@@ -0,0 +1,37 @@
+// RUN: %clang_cc1 %s -triple x86_64-pc-win32 -emit-llvm -o - | FileCheck %s
+
+typedef __SIZE_TYPE__ size_t;
+typedef __WCHAR_TYPE__ wchar_t;
+
+int wmemcmp_test(const wchar_t *s1, const wchar_t *s2, size_t n) {
+ // CHECK: [[S1:%.*]] = load
+ // CHECK: [[S2:%.*]] = load
+ // CHECK: [[N:%.*]] = load
+ // CHECK: [[N0:%.*]] = icmp eq i64 [[N]], 0
+ // CHECK: br i1 [[N0]], label %[[EXIT:.*]], label %[[GT:.*]]
+
+ // CHECK: [[GT]]:
+ // CHECK: [[S1P:%.*]] = phi i16* [ [[S1]], %[[ENTRY:.*]] ], [ [[S1N:.*]], %[[NEXT:.*]] ]
+ // CHECK: [[S2P:%.*]] = phi i16* [ [[S2]], %[[ENTRY]] ], [ [[S2N:.*]], %[[NEXT]] ]
+ // CHECK: [[NP:%.*]] = phi i64 [ [[N]], %[[ENTRY]] ], [ [[NN:.*]], %[[NEXT]] ]
+ // CHECK: [[S1L:%.*]] = load i16, i16* [[S1P]], align 2
+ // CHECK: [[S2L:%.*]] = load i16, i16* [[S2P]], align 2
+ // CHECK: [[CMPGT:%.*]] = icmp ugt i16 [[S1L]], [[S2L]]
+ // CHECK: br i1 [[CMPGT]], label %[[EXIT]], label %[[LT:.*]]
+
+ // CHECK: [[LT]]:
+ // CHECK: [[CMPLT:%.*]] = icmp ult i16 [[S1L]], [[S2L]]
+ // CHECK: br i1 [[CMPLT]], label %[[EXIT]], label %[[NEXT:.*]]
+
+ // CHECK: [[NEXT]]:
+ // CHECK: [[S1N]] = getelementptr inbounds i16, i16* [[S1P]], i32 1
+ // CHECK: [[S2N]] = getelementptr inbounds i16, i16* [[S2P]], i32 1
+ // CHECK: [[NN]] = sub i64 [[NP]], 1
+ // CHECK: [[NN0:%.*]] = icmp eq i64 [[NN]], 0
+ // CHECK: br i1 [[NN0]], label %[[EXIT]], label %[[GT]]
+ //
+ // CHECK: [[EXIT]]:
+ // CHECK: [[RV:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ 1, %[[GT]] ], [ -1, %[[LT]] ], [ 0, %[[NEXT]] ]
+ // CHECK: ret i32 [[RV]]
+ return __builtin_wmemcmp(s1, s2, n);
+}
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