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add testcases for the foo_with_overflow op xforms added recently and

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fix bugs exposed by the tests.  Testcases from Alastair Lynn!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90056 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-11-29 02:57:29 +00:00
parent f4538795fe
commit cd188e9665
2 changed files with 85 additions and 15 deletions
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27
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -9934,9 +9934,9 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// Create a simple add instruction, and insert it into the struct.
Instruction *Add = BinaryOperator::CreateAdd(LHS, RHS, "", &CI);
Worklist.Add(Add);
Constant *V[2];
V[0] = UndefValue::get(LHS->getType());
V[1] = ConstantInt::getTrue(*Context);
Constant *V[] = {
UndefValue::get(LHS->getType()), ConstantInt::getTrue(*Context)
};
Constant *Struct = ConstantStruct::get(*Context, V, 2, false);
return InsertValueInst::Create(Struct, Add, 0);
}
@ -9946,9 +9946,9 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// Create a simple add instruction, and insert it into the struct.
Instruction *Add = BinaryOperator::CreateNUWAdd(LHS, RHS, "", &CI);
Worklist.Add(Add);
Constant *V[2];
V[0] = UndefValue::get(LHS->getType());
V[1] = ConstantInt::getFalse(*Context);
Constant *V[] = {
UndefValue::get(LHS->getType()), ConstantInt::getFalse(*Context)
};
Constant *Struct = ConstantStruct::get(*Context, V, 2, false);
return InsertValueInst::Create(Struct, Add, 0);
}
@ -9973,7 +9973,8 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// X + 0 -> {X, false}
if (RHS->isZero()) {
Constant *V[] = {
UndefValue::get(II->getType()), ConstantInt::getFalse(*Context)
UndefValue::get(II->getOperand(0)->getType()),
ConstantInt::getFalse(*Context)
};
Constant *Struct = ConstantStruct::get(*Context, V, 2, false);
return InsertValueInst::Create(Struct, II->getOperand(1), 0);
@ -9992,7 +9993,8 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// X - 0 -> {X, false}
if (RHS->isZero()) {
Constant *V[] = {
UndefValue::get(II->getType()), ConstantInt::getFalse(*Context)
UndefValue::get(II->getOperand(1)->getType()),
ConstantInt::getFalse(*Context)
};
Constant *Struct = ConstantStruct::get(*Context, V, 2, false);
return InsertValueInst::Create(Struct, II->getOperand(1), 0);
@ -10021,11 +10023,12 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// X * 1 -> {X, false}
if (RHSI->equalsInt(1)) {
Constant *V[2];
V[0] = UndefValue::get(II->getType());
V[1] = ConstantInt::getFalse(*Context);
Constant *V[] = {
UndefValue::get(II->getOperand(1)->getType()),
ConstantInt::getFalse(*Context)
};
Constant *Struct = ConstantStruct::get(*Context, V, 2, false);
return InsertValueInst::Create(Struct, II->getOperand(1), 1);
return InsertValueInst::Create(Struct, II->getOperand(1), 0);
}
}
break;

73
test/Transforms/InstCombine/intrinsics.ll
View File

@ -1,12 +1,79 @@
; RUN: opt %s -instcombine -S | FileCheck %s
declare {i8, i1} @llvm.uadd.with.overflow.i8(i8, i8)
%overflow.result = type {i8, i1}
declare %overflow.result @llvm.uadd.with.overflow.i8(i8, i8)
declare %overflow.result @llvm.umul.with.overflow.i8(i8, i8)
define i8 @test1(i8 %A, i8 %B) {
%x = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 %A, i8 %B)
%y = extractvalue {i8, i1} %x, 0
%x = call %overflow.result @llvm.uadd.with.overflow.i8(i8 %A, i8 %B)
%y = extractvalue %overflow.result %x, 0
ret i8 %y
; CHECK: @test1
; CHECK-NEXT: %y = add i8 %A, %B
; CHECK-NEXT: ret i8 %y
}
define i8 @test2(i8 %A, i8 %B, i1* %overflowPtr) {
%and.A = and i8 %A, 127
%and.B = and i8 %B, 127
%x = call %overflow.result @llvm.uadd.with.overflow.i8(i8 %and.A, i8 %and.B)
%y = extractvalue %overflow.result %x, 0
%z = extractvalue %overflow.result %x, 1
store i1 %z, i1* %overflowPtr
ret i8 %y
; CHECK: @test2
; CHECK-NEXT: %and.A = and i8 %A, 127
; CHECK-NEXT: %and.B = and i8 %B, 127
; CHECK-NEXT: %1 = add nuw i8 %and.A, %and.B
; CHECK-NEXT: store i1 false, i1* %overflowPtr
; CHECK-NEXT: ret i8 %1
}
define i8 @test3(i8 %A, i8 %B, i1* %overflowPtr) {
%or.A = or i8 %A, -128
%or.B = or i8 %B, -128
%x = call %overflow.result @llvm.uadd.with.overflow.i8(i8 %or.A, i8 %or.B)
%y = extractvalue %overflow.result %x, 0
%z = extractvalue %overflow.result %x, 1
store i1 %z, i1* %overflowPtr
ret i8 %y
; CHECK: @test3
; CHECK-NEXT: %or.A = or i8 %A, -128
; CHECK-NEXT: %or.B = or i8 %B, -128
; CHECK-NEXT: %1 = add i8 %or.A, %or.B
; CHECK-NEXT: store i1 true, i1* %overflowPtr
; CHECK-NEXT: ret i8 %1
}
define i8 @test4(i8 %A, i1* %overflowPtr) {
%x = call %overflow.result @llvm.uadd.with.overflow.i8(i8 undef, i8 %A)
%y = extractvalue %overflow.result %x, 0
%z = extractvalue %overflow.result %x, 1
store i1 %z, i1* %overflowPtr
ret i8 %y
; CHECK: @test4
; CHECK-NEXT: ret i8 undef
}
define i8 @test5(i8 %A, i1* %overflowPtr) {
%x = call %overflow.result @llvm.umul.with.overflow.i8(i8 0, i8 %A)
%y = extractvalue %overflow.result %x, 0
%z = extractvalue %overflow.result %x, 1
store i1 %z, i1* %overflowPtr
ret i8 %y
; CHECK: @test5
; CHECK-NEXT: store i1 false, i1* %overflowPtr
; CHECK-NEXT: ret i8 0
}
define i8 @test6(i8 %A, i1* %overflowPtr) {
%x = call %overflow.result @llvm.umul.with.overflow.i8(i8 1, i8 %A)
%y = extractvalue %overflow.result %x, 0
%z = extractvalue %overflow.result %x, 1
store i1 %z, i1* %overflowPtr
ret i8 %y
; CHECK: @test6
; CHECK-NEXT: store i1 false, i1* %overflowPtr
; CHECK-NEXT: ret i8 %A
}