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[AggressiveInstCombine] add tests for PR37098; NFC 

I'm not sure if this is where we should try to fold these
patterns inspired by:
https://bugs.llvm.org/show_bug.cgi?id=37098
...if this isn't the right place, we can move the tests.

llvm-svn: 330642
This commit is contained in:
Sanjay Patel 2018-04-23 20:20:32 +00:00
parent 8edff27923
commit fa8f5ad9f3
1 changed files with 39 additions and 0 deletions
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39
llvm/test/Transforms/AggressiveInstCombine/masked-cmp.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -aggressive-instcombine -S | FileCheck %s
; PR37098 - https://bugs.llvm.org/show_bug.cgi?id=37098
define i32 @two_bit_mask(i32 %x) {
; CHECK-LABEL: @two_bit_mask(
; CHECK-NEXT: [[S:%.*]] = lshr i32 [[X:%.*]], 3
; CHECK-NEXT: [[O:%.*]] = or i32 [[S]], [[X]]
; CHECK-NEXT: [[R:%.*]] = and i32 [[O]], 1
; CHECK-NEXT: ret i32 [[R]]
;
%s = lshr i32 %x, 3
%o = or i32 %s, %x
%r = and i32 %o, 1
ret i32 %r
}
define i32 @four_bit_mask(i32 %x) {
; CHECK-LABEL: @four_bit_mask(
; CHECK-NEXT: [[T1:%.*]] = lshr i32 [[X:%.*]], 3
; CHECK-NEXT: [[T2:%.*]] = lshr i32 [[X]], 5
; CHECK-NEXT: [[T3:%.*]] = lshr i32 [[X]], 8
; CHECK-NEXT: [[O1:%.*]] = or i32 [[T1]], [[X]]
; CHECK-NEXT: [[O2:%.*]] = or i32 [[T2]], [[T3]]
; CHECK-NEXT: [[O3:%.*]] = or i32 [[O1]], [[O2]]
; CHECK-NEXT: [[R:%.*]] = and i32 [[O3]], 1
; CHECK-NEXT: ret i32 [[R]]
;
%t1 = lshr i32 %x, 3
%t2 = lshr i32 %x, 5
%t3 = lshr i32 %x, 8
%o1 = or i32 %t1, %x
%o2 = or i32 %t2, %t3
%o3 = or i32 %o1, %o2
%r = and i32 %o3, 1
ret i32 %r
}