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19 lines
643 B
LLVM
19 lines
643 B
LLVM
; This file contains various testcases that check to see that instcombine
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; is narrowing computations when possible.
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; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine | llvm-dis | \
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; RUN: grep 'ret i1 false'
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; test1 - Eliminating the casts in this testcase (by narrowing the AND
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; operation) allows instcombine to realize the function always returns false.
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;
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bool %test1(int %A, int %B) {
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%C1 = setlt int %A, %B
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%ELIM1 = zext bool %C1 to uint
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%C2 = setgt int %A, %B
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%ELIM2 = zext bool %C2 to uint
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%C3 = and uint %ELIM1, %ELIM2
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%ELIM3 = trunc uint %C3 to bool
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ret bool %ELIM3
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}
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