and-xor.ll
990 Bytes
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; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s
; CHECK-LABEL: @test1
; CHECK: --> (zext
; CHECK: --> (zext
; CHECK-NOT: --> (zext
define i32 @test1(i32 %x) {
%n = and i32 %x, 255
%y = xor i32 %n, 255
ret i32 %y
}
; ScalarEvolution shouldn't try to analyze %z into something like
; --> (zext i4 (-1 + (-1 * (trunc i64 (8 * %x) to i4))) to i64)
; or
; --> (8 * (zext i1 (trunc i64 ((8 * %x) /u 8) to i1) to i64))
; CHECK-LABEL: @test2
; CHECK: --> (8 * (zext i1 (trunc i64 %x to i1) to i64))
define i64 @test2(i64 %x) {
%a = shl i64 %x, 3
%t = and i64 %a, 8
%z = xor i64 %t, 8
ret i64 %z
}
; Check that we transform the naive lowering of the sequence below,
; (4 * (zext i5 (2 * (trunc i32 %x to i5)) to i32)),
; to
; (8 * (zext i4 (trunc i32 %x to i4) to i32))
;
; CHECK-LABEL: @test3
define i32 @test3(i32 %x) {
%a = mul i32 %x, 8
; CHECK: %b
; CHECK-NEXT: --> (8 * (zext i4 (trunc i32 %x to i4) to i32))
%b = and i32 %a, 124
ret i32 %b
}