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llvm-mirror/test/Transforms/IndVarSimplify/eliminate-comparison.ll
Max Kazantsev 9e73a14fba Re-enable "[IndVars] Canonicalize comparisons between non-negative values and indvars" 
The patch was reverted due to a bug. The bug was that if the IV is the 2nd operand of the icmp
instruction, then the "Pred" variable gets swapped and differs from the instruction's predicate.
In this patch we use the original predicate to do the transformation.

Also added a test case that exercises this situation.

Differentian Revision: https://reviews.llvm.org/D35107

llvm-svn: 307477
2017-07-08 17:17:30 +00:00

560 lines
15 KiB
LLVM
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; RUN: opt -indvars -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
@X = external global [0 x double]
; Indvars should be able to simplify simple comparisons involving
; induction variables.
; CHECK-LABEL: @foo(
; CHECK: %cond = and i1 %tobool.not, true
define void @foo(i64 %n, i32* nocapture %p) nounwind {
entry:
%cmp9 = icmp sgt i64 %n, 0
br i1 %cmp9, label %pre, label %return
pre:
%t3 = load i32, i32* %p
%tobool.not = icmp ne i32 %t3, 0
br label %loop
loop:
%i = phi i64 [ 0, %pre ], [ %inc, %for.inc ]
%cmp6 = icmp slt i64 %i, %n
%cond = and i1 %tobool.not, %cmp6
br i1 %cond, label %if.then, label %for.inc
if.then:
%arrayidx = getelementptr [0 x double], [0 x double]* @X, i64 0, i64 %i
store double 3.200000e+00, double* %arrayidx
br label %for.inc
for.inc:
%inc = add nsw i64 %i, 1
%exitcond = icmp sge i64 %inc, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; Don't eliminate an icmp that's contributing to the loop exit test though.
; CHECK-LABEL: @_ZNK4llvm5APInt3ultERKS0_(
; CHECK: %tmp99 = icmp sgt i32 %i, -1
define i32 @_ZNK4llvm5APInt3ultERKS0_(i32 %tmp2.i1, i64** %tmp65, i64** %tmp73, i64** %tmp82, i64** %tmp90) {
entry:
br label %bb18
bb13:
%tmp66 = load i64*, i64** %tmp65, align 4
%tmp68 = getelementptr inbounds i64, i64* %tmp66, i32 %i
%tmp69 = load i64, i64* %tmp68, align 4
%tmp74 = load i64*, i64** %tmp73, align 4
%tmp76 = getelementptr inbounds i64, i64* %tmp74, i32 %i
%tmp77 = load i64, i64* %tmp76, align 4
%tmp78 = icmp ugt i64 %tmp69, %tmp77
br i1 %tmp78, label %bb20.loopexit, label %bb15
bb15:
%tmp83 = load i64*, i64** %tmp82, align 4
%tmp85 = getelementptr inbounds i64, i64* %tmp83, i32 %i
%tmp86 = load i64, i64* %tmp85, align 4
%tmp91 = load i64*, i64** %tmp90, align 4
%tmp93 = getelementptr inbounds i64, i64* %tmp91, i32 %i
%tmp94 = load i64, i64* %tmp93, align 4
%tmp95 = icmp ult i64 %tmp86, %tmp94
br i1 %tmp95, label %bb20.loopexit, label %bb17
bb17:
%tmp97 = add nsw i32 %i, -1
br label %bb18
bb18:
%i = phi i32 [ %tmp2.i1, %entry ], [ %tmp97, %bb17 ]
%tmp99 = icmp sgt i32 %i, -1
br i1 %tmp99, label %bb13, label %bb20.loopexit
bb20.loopexit:
%tmp.0.ph = phi i32 [ 0, %bb18 ], [ 1, %bb15 ], [ 0, %bb13 ]
ret i32 %tmp.0.ph
}
; Indvars should eliminate the icmp here.
; CHECK-LABEL: @func_10(
; CHECK-NOT: icmp
; CHECK: ret void
define void @func_10() nounwind {
entry:
br label %loop
loop:
%i = phi i32 [ %i.next, %loop ], [ 0, %entry ]
%t0 = icmp slt i32 %i, 0
%t1 = zext i1 %t0 to i32
%t2 = add i32 %t1, %i
%u3 = zext i32 %t2 to i64
store i64 %u3, i64* null
%i.next = add i32 %i, 1
br i1 undef, label %loop, label %return
return:
ret void
}
; PR14432
; Indvars should not turn the second loop into an infinite one.
; CHECK-LABEL: @func_11(
; CHECK: %tmp5 = icmp ult i32 %__key6.0, 10
; CHECK-NOT: br i1 true, label %noassert68, label %unrolledend
define i32 @func_11() nounwind uwtable {
entry:
br label %forcond
forcond: ; preds = %noassert, %entry
%__key6.0 = phi i32 [ 2, %entry ], [ %tmp37, %noassert ]
%tmp5 = icmp slt i32 %__key6.0, 10
br i1 %tmp5, label %noassert, label %forcond38.preheader
forcond38.preheader: ; preds = %forcond
br label %forcond38
noassert: ; preds = %forbody
%tmp13 = sdiv i32 -32768, %__key6.0
%tmp2936 = shl i32 %tmp13, 24
%sext23 = shl i32 %tmp13, 24
%tmp32 = icmp eq i32 %tmp2936, %sext23
%tmp37 = add i32 %__key6.0, 1
br i1 %tmp32, label %forcond, label %assert33
assert33: ; preds = %noassert
tail call void @llvm.trap()
unreachable
forcond38: ; preds = %noassert68, %forcond38.preheader
%__key8.0 = phi i32 [ %tmp81, %noassert68 ], [ 2, %forcond38.preheader ]
%tmp46 = icmp slt i32 %__key8.0, 10
br i1 %tmp46, label %noassert68, label %unrolledend
noassert68: ; preds = %forbody39
%tmp57 = sdiv i32 -32768, %__key8.0
%sext34 = shl i32 %tmp57, 16
%sext21 = shl i32 %tmp57, 16
%tmp76 = icmp eq i32 %sext34, %sext21
%tmp81 = add i32 %__key8.0, 1
br i1 %tmp76, label %forcond38, label %assert77
assert77: ; preds = %noassert68
tail call void @llvm.trap()
unreachable
unrolledend: ; preds = %forcond38
ret i32 0
}
declare void @llvm.trap() noreturn nounwind
; In this case the second loop only has a single iteration, fold the header away
; CHECK-LABEL: @func_12(
; CHECK: %tmp5 = icmp ult i32 %__key6.0, 10
; CHECK: br i1 true, label %noassert68, label %unrolledend
define i32 @func_12() nounwind uwtable {
entry:
br label %forcond
forcond: ; preds = %noassert, %entry
%__key6.0 = phi i32 [ 2, %entry ], [ %tmp37, %noassert ]
%tmp5 = icmp slt i32 %__key6.0, 10
br i1 %tmp5, label %noassert, label %forcond38.preheader
forcond38.preheader: ; preds = %forcond
br label %forcond38
noassert: ; preds = %forbody
%tmp13 = sdiv i32 -32768, %__key6.0
%tmp2936 = shl i32 %tmp13, 24
%sext23 = shl i32 %tmp13, 24
%tmp32 = icmp eq i32 %tmp2936, %sext23
%tmp37 = add i32 %__key6.0, 1
br i1 %tmp32, label %forcond, label %assert33
assert33: ; preds = %noassert
tail call void @llvm.trap()
unreachable
forcond38: ; preds = %noassert68, %forcond38.preheader
%__key8.0 = phi i32 [ %tmp81, %noassert68 ], [ 2, %forcond38.preheader ]
%tmp46 = icmp slt i32 %__key8.0, 10
br i1 %tmp46, label %noassert68, label %unrolledend
noassert68: ; preds = %forbody39
%tmp57 = sdiv i32 -32768, %__key8.0
%sext34 = shl i32 %tmp57, 16
%sext21 = shl i32 %tmp57, 16
%tmp76 = icmp ne i32 %sext34, %sext21
%tmp81 = add i32 %__key8.0, 1
br i1 %tmp76, label %forcond38, label %assert77
assert77: ; preds = %noassert68
tail call void @llvm.trap()
unreachable
unrolledend: ; preds = %forcond38
ret i32 0
}
declare void @side_effect()
define void @func_13(i32* %len.ptr) {
; CHECK-LABEL: @func_13(
entry:
%len = load i32, i32* %len.ptr, !range !0
%len.sub.1 = add i32 %len, -1
%len.is.zero = icmp eq i32 %len, 0
br i1 %len.is.zero, label %leave, label %loop
loop:
; CHECK: loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp ult i32 %iv, %len
br i1 %iv.cmp, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp ult i32 %iv, %len.sub.1
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_14(i32* %len.ptr) {
; CHECK-LABEL: @func_14(
entry:
%len = load i32, i32* %len.ptr, !range !0
%len.sub.1 = add i32 %len, -1
%len.is.zero = icmp eq i32 %len, 0
%len.is.int_min = icmp eq i32 %len, 2147483648
%no.entry = or i1 %len.is.zero, %len.is.int_min
br i1 %no.entry, label %leave, label %loop
loop:
; CHECK: loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp slt i32 %iv, %len
br i1 %iv.cmp, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv, %len.sub.1
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_15(i32* %len.ptr) {
; CHECK-LABEL: @func_15(
entry:
%len = load i32, i32* %len.ptr, !range !0
%len.add.1 = add i32 %len, 1
%len.add.1.is.zero = icmp eq i32 %len.add.1, 0
br i1 %len.add.1.is.zero, label %leave, label %loop
loop:
; CHECK: loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp ult i32 %iv, %len.add.1
br i1 %iv.cmp, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp ult i32 %iv, %len
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_16(i32* %len.ptr) {
; CHECK-LABEL: @func_16(
entry:
%len = load i32, i32* %len.ptr, !range !0
%len.add.5 = add i32 %len, 5
%entry.cond.0 = icmp slt i32 %len, 2147483643
%entry.cond.1 = icmp slt i32 4, %len.add.5
%entry.cond = and i1 %entry.cond.0, %entry.cond.1
br i1 %entry.cond, label %loop, label %leave
loop:
; CHECK: loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.add.4 = add i32 %iv, 4
%iv.cmp = icmp slt i32 %iv.add.4, %len.add.5
br i1 %iv.cmp, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv, %len
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_17(i32* %len.ptr) {
; CHECK-LABEL: @func_17(
entry:
%len = load i32, i32* %len.ptr
%len.add.5 = add i32 %len, -5
%entry.cond.0 = icmp slt i32 %len, 2147483653 ;; 2147483653 == INT_MIN - (-5)
%entry.cond.1 = icmp slt i32 -6, %len.add.5
%entry.cond = and i1 %entry.cond.0, %entry.cond.1
br i1 %entry.cond, label %loop, label %leave
loop:
; CHECK: loop:
%iv.2 = phi i32 [ 0, %entry ], [ %iv.2.inc, %be ]
%iv = phi i32 [ -6, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.2.inc = add i32 %iv.2, 1
%iv.cmp = icmp slt i32 %iv, %len.add.5
; Deduces {-5,+,1} s< (-5 + %len) from {0,+,1} < %len
; since %len s< INT_MIN - (-5) from the entry condition
; CHECK: br i1 true, label %be, label %leave
br i1 %iv.cmp, label %be, label %leave
be:
; CHECK: be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.2, %len
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define i1 @func_18(i16* %tmp20, i32* %len.addr) {
; CHECK-LABEL: @func_18(
entry:
%len = load i32, i32* %len.addr, !range !0
%tmp18 = icmp eq i32 %len, 0
br i1 %tmp18, label %bb2, label %bb0.preheader
bb0.preheader:
br label %bb0
bb0:
; CHECK: bb0:
%var_0.in = phi i32 [ %var_0, %bb1 ], [ %len, %bb0.preheader ]
%var_1 = phi i32 [ %tmp30, %bb1 ], [ 0, %bb0.preheader ]
%var_0 = add nsw i32 %var_0.in, -1
%tmp23 = icmp ult i32 %var_1, %len
; CHECK: br i1 true, label %stay, label %bb2.loopexit
br i1 %tmp23, label %stay, label %bb2
stay:
; CHECK: stay:
%tmp25 = getelementptr inbounds i16, i16* %tmp20, i32 %var_1
%tmp26 = load i16, i16* %tmp25
%tmp29 = icmp eq i16 %tmp26, 0
br i1 %tmp29, label %bb1, label %bb2
bb1:
%tmp30 = add i32 %var_1, 1
%tmp31 = icmp eq i32 %var_0, 0
br i1 %tmp31, label %bb3, label %bb0
bb2:
ret i1 false
bb3:
ret i1 true
}
define void @func_19(i32* %length.ptr) {
; CHECK-LABEL: @func_19(
entry:
%length = load i32, i32* %length.ptr, !range !0
%length.is.nonzero = icmp ne i32 %length, 0
br i1 %length.is.nonzero, label %loop, label %leave
loop:
; CHECK: loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp ult i32 %iv, %length
br i1 %range.check, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave.loopexit
; CHECK: be:
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_20(i32* %length.ptr) {
; Like @func_19, but %length is no longer provably positive, so
; %range.check cannot be proved to be always true.
; CHECK-LABEL: @func_20(
entry:
%length = load i32, i32* %length.ptr
%length.is.nonzero = icmp ne i32 %length, 0
br i1 %length.is.nonzero, label %loop, label %leave
loop:
; CHECK: loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp ult i32 %iv, %length
br i1 %range.check, label %be, label %leave
; CHECK: br i1 %range.check, label %be, label %leave.loopexit
; CHECK: be:
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_21(i32* %length.ptr) {
; CHECK-LABEL: @func_21(
; This checks that the backedge condition, (I + 1) < Length - 1 implies
; (I + 1) < Length
entry:
%length = load i32, i32* %length.ptr, !range !0
%lim = sub i32 %length, 1
%entry.cond = icmp sgt i32 %length, 1
br i1 %entry.cond, label %loop, label %leave
loop:
; CHECK: loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp slt i32 %iv, %length
br i1 %range.check, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave.loopexit
; CHECK: be:
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %lim
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_22(i32* %length.ptr) {
; CHECK-LABEL: @func_22(
; This checks that the backedge condition, (I + 1) < Length - 1 implies
; (I + 1) < Length
entry:
%length = load i32, i32* %length.ptr, !range !0
%lim = sub i32 %length, 1
%entry.cond = icmp sgt i32 %length, 1
br i1 %entry.cond, label %loop, label %leave
loop:
; CHECK: loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp sle i32 %iv, %length
br i1 %range.check, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave.loopexit
; CHECK: be:
be:
call void @side_effect()
%be.cond = icmp sle i32 %iv.inc, %lim
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_23(i32* %length.ptr) {
; CHECK-LABEL: @func_23(
entry:
%length = load i32, i32* %length.ptr, !range !0
%entry.cond = icmp ult i32 4, %length
br i1 %entry.cond, label %loop, label %leave
loop:
; CHECK: loop:
%iv = phi i32 [ 4, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp slt i32 %iv, %length
br i1 %range.check, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave.loopexit
; CHECK: be:
be:
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
define void @func_24(i32* %init.ptr) {
; CHECK-LABEL: @func_24(
entry:
%init = load i32, i32* %init.ptr, !range !0
%entry.cond = icmp ugt i32 %init, 4
br i1 %entry.cond, label %loop, label %leave
loop:
; CHECK: loop:
%iv = phi i32 [ %init, %entry ], [ %iv.dec, %be ]
%iv.dec = add i32 %iv, -1
%range.check = icmp sgt i32 %iv, 4
br i1 %range.check, label %be, label %leave
; CHECK: br i1 true, label %be, label %leave.loopexit
; CHECK: be:
be:
call void @side_effect()
%be.cond = icmp sgt i32 %iv.dec, 4
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
!0 = !{i32 0, i32 2147483647}
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