clang/0001-CodeGen-Handle-mixed-width-ops-in-mixed-sign-mul-wit.patch

From b9d6dba608ab50d2e4a1b0f2318a5d1b390fc702 Mon Sep 17 00:00:00 2001
From: Vedant Kumar <vsk@apple.com>
Date: Tue, 18 Dec 2018 21:05:03 +0000
Subject: [PATCH] [CodeGen] Handle mixed-width ops in mixed-sign
 mul-with-overflow lowering

The special lowering for __builtin_mul_overflow introduced in r320902
fixed an ICE seen when passing mixed-sign operands to the builtin.

This patch extends the special lowering to cover mixed-width, mixed-sign
operands. In a few common scenarios, calls to muloti4 will no longer be
emitted.

This should address the latest comments in PR34920 and work around the
link failure seen in:

  https://bugzilla.redhat.com/show_bug.cgi?id=1657544

Testing:
- check-clang
- A/B output comparison with: https://gist.github.com/vedantk/3eb9c88f82e5c32f2e590555b4af5081

Differential Revision: https://reviews.llvm.org/D55843

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@349542 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGBuiltin.cpp        | 19 ++++++++++++++-----
 test/CodeGen/builtins-overflow.c | 21 +++++++++++++++++++++
 2 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index 0770c20..4303a7a 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -1077,7 +1077,7 @@ static bool isSpecialMixedSignMultiply(unsigned BuiltinID,
                                        WidthAndSignedness Op2Info,
                                        WidthAndSignedness ResultInfo) {
   return BuiltinID == Builtin::BI__builtin_mul_overflow &&
-         Op1Info.Width == Op2Info.Width && Op1Info.Width >= ResultInfo.Width &&
+         std::max(Op1Info.Width, Op2Info.Width) >= ResultInfo.Width &&
          Op1Info.Signed != Op2Info.Signed;
 }
 
@@ -1098,11 +1098,20 @@ EmitCheckedMixedSignMultiply(CodeGenFunction &CGF, const clang::Expr *Op1,
   const clang::Expr *UnsignedOp = Op1Info.Signed ? Op2 : Op1;
   llvm::Value *Signed = CGF.EmitScalarExpr(SignedOp);
   llvm::Value *Unsigned = CGF.EmitScalarExpr(UnsignedOp);
+  unsigned SignedOpWidth = Op1Info.Signed ? Op1Info.Width : Op2Info.Width;
+  unsigned UnsignedOpWidth = Op1Info.Signed ? Op2Info.Width : Op1Info.Width;
+
+  // One of the operands may be smaller than the other. If so, [s|z]ext it.
+  if (SignedOpWidth < UnsignedOpWidth)
+    Signed = CGF.Builder.CreateSExt(Signed, Unsigned->getType(), "op.sext");
+  if (UnsignedOpWidth < SignedOpWidth)
+    Unsigned = CGF.Builder.CreateZExt(Unsigned, Signed->getType(), "op.zext");
 
   llvm::Type *OpTy = Signed->getType();
   llvm::Value *Zero = llvm::Constant::getNullValue(OpTy);
   Address ResultPtr = CGF.EmitPointerWithAlignment(ResultArg);
   llvm::Type *ResTy = ResultPtr.getElementType();
+  unsigned OpWidth = std::max(Op1Info.Width, Op2Info.Width);
 
   // Take the absolute value of the signed operand.
   llvm::Value *IsNegative = CGF.Builder.CreateICmpSLT(Signed, Zero);
@@ -1120,8 +1129,8 @@ EmitCheckedMixedSignMultiply(CodeGenFunction &CGF, const clang::Expr *Op1,
   if (ResultInfo.Signed) {
     // Signed overflow occurs if the result is greater than INT_MAX or lesser
     // than INT_MIN, i.e when |Result| > (INT_MAX + IsNegative).
-    auto IntMax = llvm::APInt::getSignedMaxValue(ResultInfo.Width)
-                      .zextOrSelf(Op1Info.Width);
+    auto IntMax =
+        llvm::APInt::getSignedMaxValue(ResultInfo.Width).zextOrSelf(OpWidth);
     llvm::Value *MaxResult =
         CGF.Builder.CreateAdd(llvm::ConstantInt::get(OpTy, IntMax),
                               CGF.Builder.CreateZExt(IsNegative, OpTy));
@@ -1139,9 +1148,9 @@ EmitCheckedMixedSignMultiply(CodeGenFunction &CGF, const clang::Expr *Op1,
     llvm::Value *Underflow = CGF.Builder.CreateAnd(
         IsNegative, CGF.Builder.CreateIsNotNull(UnsignedResult));
     Overflow = CGF.Builder.CreateOr(UnsignedOverflow, Underflow);
-    if (ResultInfo.Width < Op1Info.Width) {
+    if (ResultInfo.Width < OpWidth) {
       auto IntMax =
-          llvm::APInt::getMaxValue(ResultInfo.Width).zext(Op1Info.Width);
+          llvm::APInt::getMaxValue(ResultInfo.Width).zext(OpWidth);
       llvm::Value *TruncOverflow = CGF.Builder.CreateICmpUGT(
           UnsignedResult, llvm::ConstantInt::get(OpTy, IntMax));
       Overflow = CGF.Builder.CreateOr(Overflow, TruncOverflow);
diff --git a/test/CodeGen/builtins-overflow.c b/test/CodeGen/builtins-overflow.c
index 57f90eb..79a3186 100644
--- a/test/CodeGen/builtins-overflow.c
+++ b/test/CodeGen/builtins-overflow.c
@@ -339,6 +339,27 @@ long long test_smulll_overflow(long long x, long long y) {
   return result;
 }
 
+int test_mixed_sign_mul_overflow_sext_signed_op(int x, unsigned long long y) {
+// CHECK: @test_mixed_sign_mul_overflow_sext_signed_op
+// CHECK: [[SignedOp:%.*]] = sext i32 %0 to i64
+// CHECK: [[IsNeg:%.*]] = icmp slt i64 [[SignedOp]], 0
+  int result;
+  if (__builtin_mul_overflow(x, y, &result))
+    return LongErrorCode;
+  return result;
+}
+
+int test_mixed_sign_mul_overflow_zext_unsigned_op(long long x, unsigned y) {
+// CHECK: @test_mixed_sign_mul_overflow_zext_unsigned_op
+// CHECK: [[UnsignedOp:%.*]] = zext i32 %1 to i64
+// CHECK: [[IsNeg:%.*]] = icmp slt i64 %0, 0
+// CHECK: @llvm.umul.with.overflow.i64({{.*}}, i64 [[UnsignedOp]])
+  int result;
+  if (__builtin_mul_overflow(x, y, &result))
+    return LongErrorCode;
+  return result;
+}
+
 int test_mixed_sign_mull_overflow(int x, unsigned y) {
 // CHECK: @test_mixed_sign_mull_overflow
 // CHECK:       [[IsNeg:%.*]] = icmp slt i32 [[Op1:%.*]], 0
-- 
1.8.3.1