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clang-p2996/llvm/test/Transforms/IndVarSimplify/outer_phi.ll
Max Kazantsev e787678cef [Test] Add some simple tests where IndVars cannot remove a check in loop 
Previously I've added tests that require context for inference, but it
seems tha SCEV can't prove same facts even when the context isn't required.
2021-09-27 12:12:51 +07:00

763 lines
28 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -indvars -S | FileCheck %s
; RUN: opt < %s -passes=indvars -S | FileCheck %s
declare i1 @cond()
declare i32 @llvm.smax.i32(i32, i32)
; FIXME: In all tests in this file, signed_cond is equivalent to unsigned_cond, and therefore
; one of the checks in the inner loop can be removed. The key to proving it is to prove that
; %iv starts from something that is non-negative and only goes up. The positivity of its start
; follows from the fact that %outer.iv also starts from somethign non-negative and only goes
; up or remains same between iterations.
define i32 @test_01(i32 %a, i32 %b) {
; CHECK-LABEL: @test_01(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B_IS_NON_NEGATIVE:%.*]] = icmp sge i32 [[B:%.*]], 0
; CHECK-NEXT: br i1 [[B_IS_NON_NEGATIVE]], label [[OUTER_PREHEADER:%.*]], label [[FAILURE:%.*]]
; CHECK: outer.preheader:
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ [[IV_NEXT_LCSSA:%.*]], [[OUTER_BACKEDGE:%.*]] ], [ 0, [[OUTER_PREHEADER]] ]
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[OUTER_IV]], [[OUTER]] ], [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[IV_NEXT_LCSSA]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: failure:
; CHECK-NEXT: unreachable
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b_is_non_negative = icmp sge i32 %b, 0
br i1 %b_is_non_negative, label %outer, label %failure
outer:
%outer.iv = phi i32 [0, %entry], [%iv.next, %outer.backedge]
br label %inner
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp slt i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp ult i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
failure:
unreachable
side.exit:
ret i32 0
exit:
ret i32 1
}
; FIXME: iv <u b, b >=s 0 --> iv <s b. We should be able to remove the 2nd check.
define i32 @test_01a(i32 %a, i32 %b) {
; CHECK-LABEL: @test_01a(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B_IS_NON_NEGATIVE:%.*]] = icmp sge i32 [[B:%.*]], 0
; CHECK-NEXT: br i1 [[B_IS_NON_NEGATIVE]], label [[OUTER_PREHEADER:%.*]], label [[FAILURE:%.*]]
; CHECK: outer.preheader:
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ [[IV_NEXT_LCSSA:%.*]], [[OUTER_BACKEDGE:%.*]] ], [ 0, [[OUTER_PREHEADER]] ]
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[OUTER_IV]], [[OUTER]] ], [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[IV_NEXT_LCSSA]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: failure:
; CHECK-NEXT: unreachable
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b_is_non_negative = icmp sge i32 %b, 0
br i1 %b_is_non_negative, label %outer, label %failure
outer:
%outer.iv = phi i32 [0, %entry], [%iv.next, %outer.backedge]
br label %inner
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp ult i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp slt i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
failure:
unreachable
side.exit:
ret i32 0
exit:
ret i32 1
}
define i32 @test_02(i32 %a, i32 %b) {
; CHECK-LABEL: @test_02(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B_IS_NON_NEGATIVE:%.*]] = icmp sge i32 [[B:%.*]], 0
; CHECK-NEXT: br i1 [[B_IS_NON_NEGATIVE]], label [[OUTER_PREHEADER:%.*]], label [[FAILURE:%.*]]
; CHECK: outer.preheader:
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ [[OUTER_MERGE:%.*]], [[OUTER_BACKEDGE:%.*]] ], [ 0, [[OUTER_PREHEADER]] ]
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[OUTER_IV]], [[OUTER]] ], [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[OUTER_MERGE]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: failure:
; CHECK-NEXT: unreachable
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b_is_non_negative = icmp sge i32 %b, 0
br i1 %b_is_non_negative, label %outer, label %failure
outer:
%outer.iv = phi i32 [0, %entry], [%outer.merge, %outer.backedge]
br label %inner
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp slt i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp ult i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.merge = phi i32 [%iv.next, %inner.backedge]
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
failure:
unreachable
side.exit:
ret i32 0
exit:
ret i32 1
}
define i32 @test_03(i32 %a, i32 %b) {
; CHECK-LABEL: @test_03(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B_IS_NON_NEGATIVE:%.*]] = icmp sge i32 [[B:%.*]], 0
; CHECK-NEXT: br i1 [[B_IS_NON_NEGATIVE]], label [[OUTER_PREHEADER:%.*]], label [[FAILURE:%.*]]
; CHECK: outer.preheader:
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ [[OUTER_MERGE:%.*]], [[OUTER_BACKEDGE:%.*]] ], [ 0, [[OUTER_PREHEADER]] ]
; CHECK-NEXT: [[OUTER_COND_1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_COND_1]], label [[INNER_PREHEADER:%.*]], label [[NO_INNER:%.*]]
; CHECK: inner.preheader:
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: no_inner:
; CHECK-NEXT: [[OUTER_COND_2:%.*]] = call i1 @cond()
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ], [ [[OUTER_IV]], [[INNER_PREHEADER]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE_LOOPEXIT:%.*]]
; CHECK: outer.backedge.loopexit:
; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[OUTER_MERGE]] = phi i32 [ [[OUTER_IV]], [[NO_INNER]] ], [ [[IV_NEXT_LCSSA]], [[OUTER_BACKEDGE_LOOPEXIT]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: failure:
; CHECK-NEXT: unreachable
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b_is_non_negative = icmp sge i32 %b, 0
br i1 %b_is_non_negative, label %outer, label %failure
outer:
%outer.iv = phi i32 [0, %entry], [%outer.merge, %outer.backedge]
%outer_cond_1 = call i1 @cond()
br i1 %outer_cond_1, label %inner, label %no_inner
no_inner:
%outer_cond_2 = call i1 @cond()
br label %outer.backedge
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp slt i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp ult i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.merge = phi i32 [%outer.iv, %no_inner], [%iv.next, %inner.backedge]
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
failure:
unreachable
side.exit:
ret i32 0
exit:
ret i32 1
}
define i32 @test_04(i32 %a, i32 %b) {
; CHECK-LABEL: @test_04(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B_IS_NON_NEGATIVE:%.*]] = icmp sge i32 [[B:%.*]], 0
; CHECK-NEXT: br i1 [[B_IS_NON_NEGATIVE]], label [[OUTER_PREHEADER:%.*]], label [[FAILURE:%.*]]
; CHECK: outer.preheader:
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ [[OUTER_MERGE:%.*]], [[OUTER_BACKEDGE:%.*]] ], [ 0, [[OUTER_PREHEADER]] ]
; CHECK-NEXT: [[OUTER_COND_1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_COND_1]], label [[INNER_PREHEADER:%.*]], label [[NO_INNER:%.*]]
; CHECK: inner.preheader:
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: no_inner:
; CHECK-NEXT: [[OUTER_COND_2:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_COND_2]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[A:%.*]], i32 [[OUTER_IV]])
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: if.false:
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ], [ [[OUTER_IV]], [[INNER_PREHEADER]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE_LOOPEXIT:%.*]]
; CHECK: outer.backedge.loopexit:
; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[OUTER_MERGE]] = phi i32 [ [[SMAX]], [[IF_TRUE]] ], [ [[OUTER_IV]], [[IF_FALSE]] ], [ [[IV_NEXT_LCSSA]], [[OUTER_BACKEDGE_LOOPEXIT]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: failure:
; CHECK-NEXT: unreachable
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b_is_non_negative = icmp sge i32 %b, 0
br i1 %b_is_non_negative, label %outer, label %failure
outer:
%outer.iv = phi i32 [0, %entry], [%outer.merge, %outer.backedge]
%outer_cond_1 = call i1 @cond()
br i1 %outer_cond_1, label %inner, label %no_inner
no_inner:
%outer_cond_2 = call i1 @cond()
br i1 %outer_cond_2, label %if.true, label %if.false
if.true:
%smax = call i32 @llvm.smax.i32(i32 %a, i32 %outer.iv)
br label %outer.backedge
if.false:
br label %outer.backedge
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp slt i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp ult i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.merge = phi i32 [%smax, %if.true], [%outer.iv, %if.false], [%iv.next, %inner.backedge]
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
failure:
unreachable
side.exit:
ret i32 0
exit:
ret i32 1
}
; Same as test_01, but non-negativity of %b is known without context.
; FIXME: We can remove 2nd check in loop.
define i32 @test_05(i32 %a, i32* %bp) {
; CHECK-LABEL: @test_05(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = load i32, i32* [[BP:%.*]], align 4, !range [[RNG0:![0-9]+]]
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT_LCSSA:%.*]], [[OUTER_BACKEDGE:%.*]] ]
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[OUTER_IV]], [[OUTER]] ], [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[IV_NEXT_LCSSA]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b = load i32, i32* %bp, !range !0
br label %outer
outer:
%outer.iv = phi i32 [0, %entry], [%iv.next, %outer.backedge]
br label %inner
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp slt i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp ult i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
side.exit:
ret i32 0
exit:
ret i32 1
}
; Same as test_01a, but non-negativity of %b is known without context.
; FIXME: We can remove 2nd check in loop.
define i32 @test_05a(i32 %a, i32* %bp) {
; CHECK-LABEL: @test_05a(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = load i32, i32* [[BP:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT_LCSSA:%.*]], [[OUTER_BACKEDGE:%.*]] ]
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[OUTER_IV]], [[OUTER]] ], [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[IV_NEXT_LCSSA]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b = load i32, i32* %bp, !range !0
br label %outer
outer:
%outer.iv = phi i32 [0, %entry], [%iv.next, %outer.backedge]
br label %inner
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp ult i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp slt i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
side.exit:
ret i32 0
exit:
ret i32 1
}
; Same as test_02, but non-negativity of %b is known without context.
; FIXME: We can remove 2nd check in loop.
define i32 @test_06(i32 %a, i32* %bp) {
; CHECK-LABEL: @test_06(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = load i32, i32* [[BP:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[OUTER_MERGE:%.*]], [[OUTER_BACKEDGE:%.*]] ]
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[OUTER_IV]], [[OUTER]] ], [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[OUTER_MERGE]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b = load i32, i32* %bp, !range !0
br label %outer
outer:
%outer.iv = phi i32 [0, %entry], [%outer.merge, %outer.backedge]
br label %inner
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp slt i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp ult i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.merge = phi i32 [%iv.next, %inner.backedge]
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
side.exit:
ret i32 0
exit:
ret i32 1
}
; Same as test_03, but non-negativity of %b is known without context.
; FIXME: We can remove 2nd check in loop.
define i32 @test_07(i32 %a, i32* %bp) {
; CHECK-LABEL: @test_07(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = load i32, i32* [[BP:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[OUTER_MERGE:%.*]], [[OUTER_BACKEDGE:%.*]] ]
; CHECK-NEXT: [[OUTER_COND_1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_COND_1]], label [[INNER_PREHEADER:%.*]], label [[NO_INNER:%.*]]
; CHECK: inner.preheader:
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: no_inner:
; CHECK-NEXT: [[OUTER_COND_2:%.*]] = call i1 @cond()
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ], [ [[OUTER_IV]], [[INNER_PREHEADER]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE_LOOPEXIT:%.*]]
; CHECK: outer.backedge.loopexit:
; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[OUTER_MERGE]] = phi i32 [ [[OUTER_IV]], [[NO_INNER]] ], [ [[IV_NEXT_LCSSA]], [[OUTER_BACKEDGE_LOOPEXIT]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b = load i32, i32* %bp, !range !0
br label %outer
outer:
%outer.iv = phi i32 [0, %entry], [%outer.merge, %outer.backedge]
%outer_cond_1 = call i1 @cond()
br i1 %outer_cond_1, label %inner, label %no_inner
no_inner:
%outer_cond_2 = call i1 @cond()
br label %outer.backedge
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp slt i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp ult i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.merge = phi i32 [%outer.iv, %no_inner], [%iv.next, %inner.backedge]
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
side.exit:
ret i32 0
exit:
ret i32 1
}
; Same as test_04, but non-negativity of %b is known without context.
; FIXME: We can remove 2nd check in loop.
define i32 @test_08(i32 %a, i32* %bp) {
; CHECK-LABEL: @test_08(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = load i32, i32* [[BP:%.*]], align 4, !range [[RNG0]]
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[OUTER_MERGE:%.*]], [[OUTER_BACKEDGE:%.*]] ]
; CHECK-NEXT: [[OUTER_COND_1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_COND_1]], label [[INNER_PREHEADER:%.*]], label [[NO_INNER:%.*]]
; CHECK: inner.preheader:
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: no_inner:
; CHECK-NEXT: [[OUTER_COND_2:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_COND_2]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[A:%.*]], i32 [[OUTER_IV]])
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: if.false:
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: inner:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[INNER_BACKEDGE:%.*]] ], [ [[OUTER_IV]], [[INNER_PREHEADER]] ]
; CHECK-NEXT: [[SIGNED_COND:%.*]] = icmp slt i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[SIGNED_COND]], label [[INNER_1:%.*]], label [[SIDE_EXIT:%.*]]
; CHECK: inner.1:
; CHECK-NEXT: [[UNSIGNED_COND:%.*]] = icmp ult i32 [[IV]], [[B]]
; CHECK-NEXT: br i1 [[UNSIGNED_COND]], label [[INNER_BACKEDGE]], label [[SIDE_EXIT]]
; CHECK: inner.backedge:
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: [[INNER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[INNER_LOOP_COND]], label [[INNER]], label [[OUTER_BACKEDGE_LOOPEXIT:%.*]]
; CHECK: outer.backedge.loopexit:
; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i32 [ [[IV_NEXT]], [[INNER_BACKEDGE]] ]
; CHECK-NEXT: br label [[OUTER_BACKEDGE]]
; CHECK: outer.backedge:
; CHECK-NEXT: [[OUTER_MERGE]] = phi i32 [ [[SMAX]], [[IF_TRUE]] ], [ [[OUTER_IV]], [[IF_FALSE]] ], [ [[IV_NEXT_LCSSA]], [[OUTER_BACKEDGE_LOOPEXIT]] ]
; CHECK-NEXT: [[OUTER_LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[OUTER_LOOP_COND]], label [[OUTER]], label [[EXIT:%.*]]
; CHECK: side.exit:
; CHECK-NEXT: ret i32 0
; CHECK: exit:
; CHECK-NEXT: ret i32 1
;
entry:
%b = load i32, i32* %bp, !range !0
br label %outer
outer:
%outer.iv = phi i32 [0, %entry], [%outer.merge, %outer.backedge]
%outer_cond_1 = call i1 @cond()
br i1 %outer_cond_1, label %inner, label %no_inner
no_inner:
%outer_cond_2 = call i1 @cond()
br i1 %outer_cond_2, label %if.true, label %if.false
if.true:
%smax = call i32 @llvm.smax.i32(i32 %a, i32 %outer.iv)
br label %outer.backedge
if.false:
br label %outer.backedge
inner:
%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
%signed_cond = icmp slt i32 %iv, %b
br i1 %signed_cond, label %inner.1, label %side.exit
inner.1:
%unsigned_cond = icmp ult i32 %iv, %b
br i1 %unsigned_cond, label %inner.backedge, label %side.exit
inner.backedge:
%iv.next = add nuw nsw i32 %iv, 1
%inner.loop.cond = call i1 @cond()
br i1 %inner.loop.cond, label %inner, label %outer.backedge
outer.backedge:
%outer.merge = phi i32 [%smax, %if.true], [%outer.iv, %if.false], [%iv.next, %inner.backedge]
%outer.loop.cond = call i1 @cond()
br i1 %outer.loop.cond, label %outer, label %exit
side.exit:
ret i32 0
exit:
ret i32 1
}
!0 = !{i32 0, i32 2147483647}
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