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5640f33331
* A & ~A == 0 * A / (2^c) == A >> c if unsigned * 0 / A == 0 * 1.0 * A == A * A * (2^c) == A << c * A ^ ~A == -1 * A | ~A == -1 * 0 % X = 0 * A % (2^c) == A & (c-1) if unsigned * A - (A & B) == A & ~B * -1 - A == ~A git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5588 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
606 B
LLVM
38 lines
606 B
LLVM
; This test makes sure that mul instructions are properly eliminated.
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;
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; RUN: if as < %s | opt -instcombine | dis | grep mul
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; RUN: then exit 1
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; RUN: else exit 0
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; RUN: fi
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implementation
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int "test1"(int %A)
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begin
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%B = mul int %A, 1
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ret int %B
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end
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int "test2"(int %A)
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begin
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%B = mul int %A, 2 ; Should convert to an add instruction
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ret int %B
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end
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int "test3"(int %A)
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begin
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%B = mul int %A, 0 ; This should disappear entirely
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ret int %B
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end
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double %test4(double %A) {
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%B = mul double 1.0, %A ; This is safe for FP
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ret double %B
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}
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int %test5(int %A) {
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%B = mul int %A, 8
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ret int %B
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}
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