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[ConstraintElimination] Decompose add nuw/sub nuw.

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Make use of the more flexible constraint handling added in
a8a79c90699a7ae9dee07daf7281cbbd592bf6ea to decompose add nuw/sub nuw.
This commit is contained in:
Florian Hahn 2020-11-18 11:25:39 +00:00
parent 93f603ff82
commit 8799552d28
3 changed files with 47 additions and 33 deletions
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14
lib/Transforms/Scalar/ConstraintElimination.cpp
View File

@ -57,6 +57,20 @@ static SmallVector<std::pair<int64_t, Value *>, 4> decompose(Value *V) {
nullptr},
{1, GEP->getPointerOperand()}};
}
Value *Op0;
Value *Op1;
ConstantInt *CI;
if (match(V, m_NUWAdd(m_Value(Op0), m_ConstantInt(CI))))
return {{CI->getSExtValue(), nullptr}, {1, Op0}};
if (match(V, m_NUWAdd(m_Value(Op0), m_Value(Op1))))
return {{0, nullptr}, {1, Op0}, {1, Op1}};
if (match(V, m_NUWSub(m_Value(Op0), m_ConstantInt(CI))))
return {{-1 * CI->getSExtValue(), nullptr}, {1, Op0}};
if (match(V, m_NUWSub(m_Value(Op0), m_Value(Op1))))
return {{0, nullptr}, {1, Op0}, {1, Op1}};
return {{0, nullptr}, {1, V}};
}

40
test/Transforms/ConstraintElimination/add-nuw.ll
View File

@ -11,16 +11,16 @@ define void @test.not.uge.ult(i8 %start, i8 %low, i8 %high) {
; CHECK-NEXT: ret void
; CHECK: if.end:
; CHECK-NEXT: [[T_0:%.*]] = icmp ult i8 [[START]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_0]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_1:%.*]] = add nuw i8 [[START]], 1
; CHECK-NEXT: [[T_1:%.*]] = icmp ult i8 [[START_1]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_1]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_2:%.*]] = add nuw i8 [[START]], 2
; CHECK-NEXT: [[T_2:%.*]] = icmp ult i8 [[START_2]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_2]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_3:%.*]] = add nuw i8 [[START]], 3
; CHECK-NEXT: [[T_3:%.*]] = icmp ult i8 [[START_3]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_3]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_4:%.*]] = add nuw i8 [[START]], 4
; CHECK-NEXT: [[C_4:%.*]] = icmp ult i8 [[START_4]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_4]])
@ -62,19 +62,19 @@ define void @test.not.uge.ule(i8 %start, i8 %low, i8 %high) {
; CHECK-NEXT: ret void
; CHECK: if.end:
; CHECK-NEXT: [[T_0:%.*]] = icmp ule i8 [[START]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_0]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_1:%.*]] = add nuw i8 [[START]], 1
; CHECK-NEXT: [[T_1:%.*]] = icmp ule i8 [[START_1]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_1]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_2:%.*]] = add nuw i8 [[START]], 2
; CHECK-NEXT: [[T_2:%.*]] = icmp ule i8 [[START_2]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_2]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_3:%.*]] = add nuw i8 [[START]], 3
; CHECK-NEXT: [[T_3:%.*]] = icmp ule i8 [[START_3]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_3]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_4:%.*]] = add nuw i8 [[START]], 4
; CHECK-NEXT: [[T_4:%.*]] = icmp ule i8 [[START_4]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_4]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_5:%.*]] = add nuw i8 [[START]], 5
; CHECK-NEXT: [[C_5:%.*]] = icmp ule i8 [[START_5]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_5]])
@ -121,19 +121,19 @@ define void @test.not.uge.ugt(i8 %start, i8 %low, i8 %high) {
; CHECK-NEXT: ret void
; CHECK: if.end:
; CHECK-NEXT: [[F_0:%.*]] = icmp ugt i8 [[START]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_0]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_1:%.*]] = add nuw i8 [[START]], 1
; CHECK-NEXT: [[F_1:%.*]] = icmp ugt i8 [[START_1]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_1]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_2:%.*]] = add nuw i8 [[START]], 2
; CHECK-NEXT: [[F_2:%.*]] = icmp ugt i8 [[START_2]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_2]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_3:%.*]] = add nuw i8 [[START]], 3
; CHECK-NEXT: [[F_3:%.*]] = icmp ugt i8 [[START_3]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_3]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_4:%.*]] = add nuw i8 [[START]], 4
; CHECK-NEXT: [[F_4:%.*]] = icmp ugt i8 [[START_4]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_4]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_5:%.*]] = add nuw i8 [[START]], 5
; CHECK-NEXT: [[C_5:%.*]] = icmp ugt i8 [[START_5]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_5]])
@ -184,16 +184,16 @@ define void @test.not.uge.uge(i8 %start, i8 %low, i8 %high) {
; CHECK-NEXT: ret void
; CHECK: if.end:
; CHECK-NEXT: [[F_0:%.*]] = icmp ugt i8 [[START]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_0]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_1:%.*]] = add nuw i8 [[START]], 1
; CHECK-NEXT: [[F_1:%.*]] = icmp uge i8 [[START_1]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_1]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_2:%.*]] = add nuw i8 [[START]], 2
; CHECK-NEXT: [[F_2:%.*]] = icmp uge i8 [[START_2]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_2]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_3:%.*]] = add nuw i8 [[START]], 3
; CHECK-NEXT: [[F_3:%.*]] = icmp uge i8 [[START_3]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_3]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_4:%.*]] = add nuw i8 [[START]], 4
; CHECK-NEXT: [[C_4:%.*]] = icmp uge i8 [[START_4]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_4]])
@ -252,10 +252,10 @@ define void @test.decompose.nonconst(i8 %a, i8 %b, i8 %c, i8 %d) {
; CHECK: if.then.2:
; CHECK-NEXT: [[ADD_0:%.*]] = add nuw i8 [[A]], [[B]]
; CHECK-NEXT: [[T_0:%.*]] = icmp uge i8 [[ADD_0]], [[C]]
; CHECK-NEXT: call void @use(i1 [[T_0]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[ADD_1:%.*]] = add nuw i8 [[A]], [[A]]
; CHECK-NEXT: [[T_1:%.*]] = icmp uge i8 [[ADD_0]], [[C]]
; CHECK-NEXT: call void @use(i1 [[T_1]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[ADD_2:%.*]] = add nuw i8 [[A]], [[D:%.*]]
; CHECK-NEXT: [[C_4:%.*]] = icmp uge i8 [[ADD_2]], [[C]]
; CHECK-NEXT: call void @use(i1 [[C_4]])

26
test/Transforms/ConstraintElimination/sub-nuw.ll
View File

@ -20,10 +20,10 @@ define void @test.not.uge.ult(i8 %start, i8 %low, i8 %high) {
; CHECK-NEXT: call void @use(i1 [[T_2]])
; CHECK-NEXT: [[START_3:%.*]] = sub nuw i8 [[START]], 3
; CHECK-NEXT: [[T_3:%.*]] = icmp ult i8 [[START_3]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_3]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_4:%.*]] = sub nuw i8 [[START]], 4
; CHECK-NEXT: [[C_4:%.*]] = icmp ult i8 [[START_4]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_4]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: ret void
;
entry:
@ -68,16 +68,16 @@ define void @test.not.uge.ule(i8 %start, i8 %low, i8 %high) {
; CHECK-NEXT: call void @use(i1 [[T_1]])
; CHECK-NEXT: [[START_2:%.*]] = sub nuw i8 [[START]], 2
; CHECK-NEXT: [[T_2:%.*]] = icmp ule i8 [[START_2]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_2]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_3:%.*]] = sub nuw i8 [[START]], 3
; CHECK-NEXT: [[T_3:%.*]] = icmp ule i8 [[START_3]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_3]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_4:%.*]] = sub nuw i8 [[START]], 4
; CHECK-NEXT: [[T_4:%.*]] = icmp ule i8 [[START_4]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[T_4]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[START_5:%.*]] = sub nuw i8 [[START]], 5
; CHECK-NEXT: [[C_5:%.*]] = icmp ule i8 [[START_5]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_5]])
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: ret void
;
entry:
@ -127,16 +127,16 @@ define void @test.not.uge.ugt(i8 %start, i8 %low, i8 %high) {
; CHECK-NEXT: call void @use(i1 [[F_1]])
; CHECK-NEXT: [[START_2:%.*]] = sub nuw i8 [[START]], 2
; CHECK-NEXT: [[F_2:%.*]] = icmp ugt i8 [[START_2]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_2]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_3:%.*]] = sub nuw i8 [[START]], 3
; CHECK-NEXT: [[F_3:%.*]] = icmp ugt i8 [[START_3]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_3]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_4:%.*]] = sub nuw i8 [[START]], 4
; CHECK-NEXT: [[F_4:%.*]] = icmp ugt i8 [[START_4]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_4]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_5:%.*]] = sub nuw i8 [[START]], 5
; CHECK-NEXT: [[C_5:%.*]] = icmp ugt i8 [[START_5]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_5]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: ret void
;
entry:
@ -193,13 +193,13 @@ define void @test.not.uge.uge(i8 %start, i8 %low, i8 %high) {
; CHECK-NEXT: call void @use(i1 [[F_2]])
; CHECK-NEXT: [[START_3:%.*]] = sub nuw i8 [[START]], 3
; CHECK-NEXT: [[F_3:%.*]] = icmp uge i8 [[START_3]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[F_3]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_4:%.*]] = sub nuw i8 [[START]], 4
; CHECK-NEXT: [[C_4:%.*]] = icmp uge i8 [[START_4]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_4]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[START_5:%.*]] = sub nuw i8 [[START]], 5
; CHECK-NEXT: [[C_5:%.*]] = icmp uge i8 [[START_5]], [[HIGH]]
; CHECK-NEXT: call void @use(i1 [[C_5]])
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: ret void
;
entry: