mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-01 17:29:33 +00:00
820528331f
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
13 lines
388 B
LLVM
13 lines
388 B
LLVM
; 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
|
|
}
|