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Diffstat (limited to 'test/Analysis/ScalarEvolution/and-xor.ll')
-rw-r--r-- | test/Analysis/ScalarEvolution/and-xor.ll | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/test/Analysis/ScalarEvolution/and-xor.ll b/test/Analysis/ScalarEvolution/and-xor.ll index 404ab91e26..ad636da4d4 100644 --- a/test/Analysis/ScalarEvolution/and-xor.ll +++ b/test/Analysis/ScalarEvolution/and-xor.ll @@ -1,11 +1,27 @@ ; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s +; CHECK-LABEL: @test1 ; CHECK: --> (zext ; CHECK: --> (zext ; CHECK-NOT: --> (zext -define i32 @foo(i32 %x) { +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 +} |