llvm/2012-04-30-SRem.ll at f5539a356c55126b5d519d0594b424bdcdeab647 - llvm - Gitea: Git with a cup of tea

RPCS3/llvm

mirror of https://github.com/RPCS3/llvm.git synced 2024-12-30 16:34:03 +00:00

Duncan Sands 5ff30e70f8 Just mark the sign bit as known zero, rather than any other irrelevant bits

known zero in the LHS.  Fixes PR12541.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155818 91177308-0d34-0410-b5e6-96231b3b80d8

2012-04-30 11:56:58 +00:00

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 ; RUN: opt -instcombine -S < %s | FileCheck %s
 ; PR12541
 define i32 @foo(i32 %x) {
   %y = xor i32 %x, 3
   %z = srem i32 1656690544, %y
   %sext = shl i32 %z, 24
   %s = ashr exact i32 %sext, 24
   ret i32 %s
 ; CHECK-NOT: and
 ; The shifts were wrongly being turned into an and with 112
 }