llvm-6502/test/Analysis/ScalarEvolution/xor-and.ll

; RUN: llvm-as < %s | opt -scalar-evolution -disable-output -analyze \
; RUN:   | grep {\\-->  (zext i4 (-8 + (trunc i64 (8 \\* %x) to i4)) to i64)}

; ScalarEvolution shouldn't try to analyze %z into something like
;   -->  (zext i4 (-1 + (-1 * (trunc i64 (8 * %x) to i4))) to i64)

define i64 @foo(i64 %x) {
  %a = shl i64 %x, 3
  %t = and i64 %a, 8
  %z = xor i64 %t, 8
  ret i64 %z
}
Teach ScalarEvolution how to recognize another xor(and(x, C), C) case. If C is a single bit and the and gets analyzed as a truncate and zero-extend, the xor can be represnted as an add. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73664 91177308-0d34-0410-b5e6-96231b3b80d8 2009-06-18 00:00:20 +00:00			`; RUN: llvm-as < %s \| opt -scalar-evolution -disable-output -analyze \`
			`; RUN: \| grep {\\--> (zext i4 (-8 + (trunc i64 (8 \\* %x) to i4)) to i64)}`
Fix ScalarEvolution's Xor handling to not assume that an And that gets recognized with a SCEVZeroExtendExpr must be an And with a low-bits mask. With r73540, this is no longer the case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73594 91177308-0d34-0410-b5e6-96231b3b80d8 2009-06-17 01:22:39 +00:00
Teach ScalarEvolution how to recognize another xor(and(x, C), C) case. If C is a single bit and the and gets analyzed as a truncate and zero-extend, the xor can be represnted as an add. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73664 91177308-0d34-0410-b5e6-96231b3b80d8 2009-06-18 00:00:20 +00:00			`; ScalarEvolution shouldn't try to analyze %z into something like`
Fix ScalarEvolution's Xor handling to not assume that an And that gets recognized with a SCEVZeroExtendExpr must be an And with a low-bits mask. With r73540, this is no longer the case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73594 91177308-0d34-0410-b5e6-96231b3b80d8 2009-06-17 01:22:39 +00:00			`; --> (zext i4 (-1 + (-1 * (trunc i64 (8 * %x) to i4))) to i64)`

			`define i64 @foo(i64 %x) {`
			`%a = shl i64 %x, 3`
			`%t = and i64 %a, 8`
			`%z = xor i64 %t, 8`
			`ret i64 %z`
			`}`