llvm-6502/test/Transforms/InstCombine/narrow.ll

19 lines
621 B
LLVM
Raw Normal View History

; This file contains various testcases that check to see that instcombine
; is narrowing computations when possible.
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep %ELIM
; XFAIL: *
; test1 - Eliminating the casts in this testcase (by narrowing the AND
; operation) allows instcombine to realize the function always returns false.
;
bool %test1(int %A, int %B) {
%C1 = setlt int %A, %B
%ELIM1 = cast bool %C1 to uint
%C2 = setgt int %A, %B
%ELIM2 = cast bool %C2 to uint
%C3 = and uint %ELIM1, %ELIM2
%ELIM3 = cast uint %C3 to bool
ret bool %ELIM3
}