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[NFC] Test that shows unprofitability of instcombine with bit ranges 

llvm-svn: 336078
This commit is contained in:
Max Kazantsev 2018-07-02 06:55:00 +00:00
parent e06dabd3ca
commit 66da390506
1 changed files with 32 additions and 0 deletions
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llvm/test/Transforms/InstCombine/icmp_sdiv_with_and_without_range.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -instcombine -S < %s | FileCheck %s
; Test that presence of range does not cause unprofitable transforms with bit
; arithmetics, and instcombine behaves exactly the same as without the range.
define i1 @without_range(i32* %A) {
; CHECK-LABEL: @without_range(
; CHECK-NEXT: [[A_VAL:%.*]] = load i32, i32* [[A:%.*]], align 8
; CHECK-NEXT: [[C:%.*]] = icmp slt i32 [[A_VAL]], 2
; CHECK-NEXT: ret i1 [[C]]
;
%A.val = load i32, i32* %A, align 8
%B = sdiv i32 %A.val, 2
%C = icmp sge i32 0, %B
ret i1 %C
}
define i1 @with_range(i32* %A) {
; CHECK-LABEL: @with_range(
; CHECK-NEXT: [[A_VAL:%.*]] = load i32, i32* [[A:%.*]], align 8, !range !0
; CHECK-NEXT: [[B_MASK:%.*]] = and i32 [[A_VAL]], 2147483646
; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[B_MASK]], 0
; CHECK-NEXT: ret i1 [[C]]
;
%A.val = load i32, i32* %A, align 8, !range !0
%B = sdiv i32 %A.val, 2
%C = icmp sge i32 0, %B
ret i1 %C
}
!0 = !{i32 0, i32 2147483647}