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Simplify negated bit test
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170020 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2034,6 +2034,15 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
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CI->countTrailingZeros()));
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CI->countTrailingZeros()));
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}
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}
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// Turn x&~y == 0 into x&y != 0 if x is a power of 2.
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Value *X = 0, *Y = 0;
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if (match(Op0, m_And(m_Value(X), m_Not(m_Value(Y)))) &&
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match(Op1, m_Zero()) && isPowerOfTwo(X, TD)) {
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return new ICmpInst(ICmpInst::ICMP_NE,
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Builder->CreateAnd(X, Y),
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Op1);
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}
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break;
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break;
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}
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}
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case ICmpInst::ICMP_NE: {
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case ICmpInst::ICMP_NE: {
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@ -2071,6 +2080,15 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
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CI->countTrailingZeros()));
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CI->countTrailingZeros()));
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}
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}
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// Turn x&~y != 0 into x&y == 0 if x is a power of 2.
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Value *X = 0, *Y = 0;
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if (match(Op0, m_And(m_Value(X), m_Not(m_Value(Y)))) &&
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match(Op1, m_Zero()) && isPowerOfTwo(X, TD)) {
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return new ICmpInst(ICmpInst::ICMP_EQ,
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Builder->CreateAnd(X, Y),
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Op1);
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}
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break;
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break;
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}
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}
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case ICmpInst::ICMP_ULT:
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case ICmpInst::ICMP_ULT:
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@ -677,3 +677,29 @@ define i1 @test66(i64 %A, i64 %B) {
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; CHECK-NEXT: ret i1 true
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; CHECK-NEXT: ret i1 true
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ret i1 %cmp
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ret i1 %cmp
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}
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}
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define i1 @test67(i32 %A, i32 %B) {
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%neg = xor i32 %A, -1
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%shl = shl i32 1, %B
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%and = and i32 %shl, %neg
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%cmp = icmp ne i32 %and, 0
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; CHECK: @test67
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; CHECK-NEXT: %shl = shl i32 1, %B
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; CHECK-NEXT: %1 = and i32 %shl, %A
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; CHECK-NEXT: %cmp = icmp eq i32 %1, 0
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; CHECK-NEXT: ret i1 %cmp
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ret i1 %cmp
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}
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define i1 @test68(i32 %A, i32 %B) {
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%neg = xor i32 %A, -1
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%shl = shl i32 1, %B
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%and = and i32 %shl, %neg
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%cmp = icmp eq i32 %and, 0
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; CHECK: @test68
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; CHECK-NEXT: %shl = shl i32 1, %B
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; CHECK-NEXT: %1 = and i32 %shl, %A
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; CHECK-NEXT: %cmp = icmp ne i32 %1, 0
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; CHECK-NEXT: ret i1 %cmp
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ret i1 %cmp
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}
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