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; RUN: opt < %s -S -instcombine | FileCheck %s
declare i8 @llvm.bitreverse.i8(i8)
declare i32 @llvm.bitreverse.i32(i32)
; CHECK-LABEL: @test1
; CHECK: ret i1 true
define i1 @test1(i32 %arg) {
%a = or i32 %arg, 4294901760
%b = call i32 @llvm.bitreverse.i32(i32 %a)
%and = and i32 %b, 65535
%res = icmp eq i32 %and, 65535
ret i1 %res
}
; CHECK-LABEL: @test2
; CHECK: ret i1 true
define i1 @test2(i32 %arg) {
%a = or i32 %arg, 1
%b = call i32 @llvm.bitreverse.i32(i32 %a)
%c = and i32 %b, 2147483648
%d = call i32 @llvm.bitreverse.i32(i32 %c)
%res = icmp eq i32 %d, 1
ret i1 %res
}
; CHECK-LABEL: @test3
; CHECK: ret i1 false
define i1 @test3(i32 %arg) {
%a = or i32 %arg, 65536
%b = call i32 @llvm.bitreverse.i32(i32 %a)
%and = and i32 %b, 32768
%res = icmp eq i32 %and, 0
ret i1 %res
}
; CHECK-LABEL: @add_bitreverse
; Make sure we process range metadata on bitreverse
define i8 @add_bitreverse(i8 %a) {
%b = and i8 %a, 252
; known bits for the bitreverse will say the result is in the range [0, 64)
; but the metadata says [0, 16). So make sure the range metadata wins.
; add %reverse, 1111 0000
; should become
; or %reverse, 1111 0000
%reverse = call i8 @llvm.bitreverse.i8(i8 %b), !range !1
%c = add i8 %reverse, -16
; CHECK: or i8 %reverse, -16
ret i8 %c
}
!1 = !{i8 0, i8 16}
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