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; RUN: opt < %s -S -passes=instcombine | FileCheck %s
; Note: This is testing functionality in computeKnownBits. I'd have rather
; used instsimplify, but the bit test folding is apparently only in instcombine.
declare i16 @llvm.bswap.i16(i16)
declare i32 @llvm.bswap.i32(i32)
define i1 @test1(i16 %arg) {
; CHECK-LABEL: @test1
; CHECK: ret i1 true
%a = or i16 %arg, 511
%b = call i16 @llvm.bswap.i16(i16 %a)
%and = and i16 %b, 256
%res = icmp eq i16 %and, 256
ret i1 %res
}
define i1 @test2(i16 %arg) {
; CHECK-LABEL: @test2
; CHECK: ret i1 true
%a = or i16 %arg, 1
%b = call i16 @llvm.bswap.i16(i16 %a)
%and = and i16 %b, 256
%res = icmp eq i16 %and, 256
ret i1 %res
}
define i1 @test3(i16 %arg) {
; CHECK-LABEL: @test3
; CHECK: ret i1 true
%a = or i16 %arg, 256
%b = call i16 @llvm.bswap.i16(i16 %a)
%and = and i16 %b, 1
%res = icmp eq i16 %and, 1
ret i1 %res
}
define i1 @test4(i32 %arg) {
; CHECK-LABEL: @test4
; CHECK: ret i1 true
%a = or i32 %arg, 2147483647 ; i32_MAX
%b = call i32 @llvm.bswap.i32(i32 %a)
%and = and i32 %b, 127
%res = icmp eq i32 %and, 127
ret i1 %res
}
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