maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[Test] Add test showing missing opportunity in IndVar's handling of lshr

This commit is contained in:
Max Kazantsev 2021-12-22 15:07:41 +07:00
parent 682532ca57
commit 958e7a284d
1 changed files with 244 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

244
llvm/test/Transforms/IndVarSimplify/shift-range-checks.ll Normal file
View File

@ -0,0 +1,244 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S < %s -indvars | FileCheck %s
; RUN: opt -S < %s -passes=indvars | FileCheck %s
declare i1 @cond()
declare void @exit(i32 %code)
; FIXME: We can remove 2nd check here because it is implied by check
; against the shifted value.
define void @test_01(i32* %p, i32 %shift) {
; CHECK-LABEL: @test_01(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P:%.*]], align 4, !range [[RNG0:![0-9]+]]
; CHECK-NEXT: [[X_SHIFTED:%.*]] = lshr i32 [[X]], [[SHIFT:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[LESS_THAN_SHIFTED:%.*]] = icmp slt i32 [[IV]], [[X_SHIFTED]]
; CHECK-NEXT: br i1 [[LESS_THAN_SHIFTED]], label [[GUARDED:%.*]], label [[FAILURE:%.*]]
; CHECK: guarded:
; CHECK-NEXT: [[LESS_THAN_X:%.*]] = icmp ult i32 [[IV]], [[X]]
; CHECK-NEXT: br i1 [[LESS_THAN_X]], label [[BACKEDGE]], label [[NEVER_HAPPENS:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[DONE:%.*]]
; CHECK: done:
; CHECK-NEXT: ret void
; CHECK: failure:
; CHECK-NEXT: call void @exit(i32 1)
; CHECK-NEXT: unreachable
; CHECK: never_happens:
; CHECK-NEXT: call void @exit(i32 0)
; CHECK-NEXT: unreachable
;
entry:
%x = load i32, i32* %p, !range !0
%x.shifted = lshr i32 %x, %shift
br label %loop
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
%less.than.shifted = icmp slt i32 %iv, %x.shifted
br i1 %less.than.shifted, label %guarded, label %failure
guarded:
%less.than.x = icmp slt i32 %iv, %x
br i1 %less.than.x, label %backedge, label %never_happens
backedge:
%iv.next = add nuw nsw i32 %iv, 1
%loop.cond = call i1 @cond()
br i1 %loop.cond, label %loop, label %done
done:
ret void
failure:
call void @exit(i32 1)
unreachable
never_happens:
call void @exit(i32 0)
unreachable
}
; FIXME: We can remove 2nd check here because it is implied by check
; against the shifted value.
define void @test_02(i32* %p, i32 %shift) {
; CHECK-LABEL: @test_02(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[X_SHIFTED:%.*]] = lshr i32 [[X]], [[SHIFT:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[LESS_THAN_SHIFTED:%.*]] = icmp sgt i32 [[X_SHIFTED]], [[IV]]
; CHECK-NEXT: br i1 [[LESS_THAN_SHIFTED]], label [[GUARDED:%.*]], label [[FAILURE:%.*]]
; CHECK: guarded:
; CHECK-NEXT: [[LESS_THAN_X:%.*]] = icmp ugt i32 [[X]], [[IV]]
; CHECK-NEXT: br i1 [[LESS_THAN_X]], label [[BACKEDGE]], label [[NEVER_HAPPENS:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[DONE:%.*]]
; CHECK: done:
; CHECK-NEXT: ret void
; CHECK: failure:
; CHECK-NEXT: call void @exit(i32 1)
; CHECK-NEXT: unreachable
; CHECK: never_happens:
; CHECK-NEXT: call void @exit(i32 0)
; CHECK-NEXT: unreachable
;
entry:
%x = load i32, i32* %p, !range !0
%x.shifted = lshr i32 %x, %shift
br label %loop
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
%less.than.shifted = icmp sgt i32 %x.shifted, %iv
br i1 %less.than.shifted, label %guarded, label %failure
guarded:
%less.than.x = icmp sgt i32 %x, %iv
br i1 %less.than.x, label %backedge, label %never_happens
backedge:
%iv.next = add nuw nsw i32 %iv, 1
%loop.cond = call i1 @cond()
br i1 %loop.cond, label %loop, label %done
done:
ret void
failure:
call void @exit(i32 1)
unreachable
never_happens:
call void @exit(i32 0)
unreachable
}
; FIXME: We can remove 2nd check here because it is implied by check
; against the shifted value.
define void @test_03(i32* %p, i32 %shift) {
; CHECK-LABEL: @test_03(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[X_SHIFTED:%.*]] = lshr i32 [[X]], [[SHIFT:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[LESS_THAN_SHIFTED:%.*]] = icmp ult i32 [[IV]], [[X_SHIFTED]]
; CHECK-NEXT: br i1 [[LESS_THAN_SHIFTED]], label [[GUARDED:%.*]], label [[FAILURE:%.*]]
; CHECK: guarded:
; CHECK-NEXT: [[LESS_THAN_X:%.*]] = icmp ult i32 [[IV]], [[X]]
; CHECK-NEXT: br i1 [[LESS_THAN_X]], label [[BACKEDGE]], label [[NEVER_HAPPENS:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[DONE:%.*]]
; CHECK: done:
; CHECK-NEXT: ret void
; CHECK: failure:
; CHECK-NEXT: call void @exit(i32 1)
; CHECK-NEXT: unreachable
; CHECK: never_happens:
; CHECK-NEXT: call void @exit(i32 0)
; CHECK-NEXT: unreachable
;
entry:
%x = load i32, i32* %p, !range !0
%x.shifted = lshr i32 %x, %shift
br label %loop
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
%less.than.shifted = icmp ult i32 %iv, %x.shifted
br i1 %less.than.shifted, label %guarded, label %failure
guarded:
%less.than.x = icmp ult i32 %iv, %x
br i1 %less.than.x, label %backedge, label %never_happens
backedge:
%iv.next = add nuw nsw i32 %iv, 1
%loop.cond = call i1 @cond()
br i1 %loop.cond, label %loop, label %done
done:
ret void
failure:
call void @exit(i32 1)
unreachable
never_happens:
call void @exit(i32 0)
unreachable
}
; FIXME: We can remove 2nd check here because it is implied by check
; against the shifted value.
define void @test_04(i32* %p, i32 %shift) {
; CHECK-LABEL: @test_04(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: [[X_SHIFTED:%.*]] = lshr i32 [[X]], [[SHIFT:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[LESS_THAN_SHIFTED:%.*]] = icmp ugt i32 [[X_SHIFTED]], [[IV]]
; CHECK-NEXT: br i1 [[LESS_THAN_SHIFTED]], label [[GUARDED:%.*]], label [[FAILURE:%.*]]
; CHECK: guarded:
; CHECK-NEXT: [[LESS_THAN_X:%.*]] = icmp ugt i32 [[X]], [[IV]]
; CHECK-NEXT: br i1 [[LESS_THAN_X]], label [[BACKEDGE]], label [[NEVER_HAPPENS:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[DONE:%.*]]
; CHECK: done:
; CHECK-NEXT: ret void
; CHECK: failure:
; CHECK-NEXT: call void @exit(i32 1)
; CHECK-NEXT: unreachable
; CHECK: never_happens:
; CHECK-NEXT: call void @exit(i32 0)
; CHECK-NEXT: unreachable
;
entry:
%x = load i32, i32* %p, !range !0
%x.shifted = lshr i32 %x, %shift
br label %loop
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
%less.than.shifted = icmp ugt i32 %x.shifted, %iv
br i1 %less.than.shifted, label %guarded, label %failure
guarded:
%less.than.x = icmp ugt i32 %x, %iv
br i1 %less.than.x, label %backedge, label %never_happens
backedge:
%iv.next = add nuw nsw i32 %iv, 1
%loop.cond = call i1 @cond()
br i1 %loop.cond, label %loop, label %done
done:
ret void
failure:
call void @exit(i32 1)
unreachable
never_happens:
call void @exit(i32 0)
unreachable
}
!0 = !{i32 0, i32 2147483647}