forked from OSchip/llvm-project
246 lines
9.6 KiB
LLVM
246 lines
9.6 KiB
LLVM
; RUN: opt -S -loop-predication -loop-predication-enable-count-down-loop=true < %s 2>&1 | FileCheck %s
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; RUN: opt -S -passes='require<scalar-evolution>,loop(loop-predication)' -loop-predication-enable-count-down-loop=true < %s 2>&1 | FileCheck %s
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declare void @llvm.experimental.guard(i1, ...)
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define i32 @signed_reverse_loop_n_to_lower_limit(i32* %array, i32 %length, i32 %n, i32 %lowerlimit) {
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; CHECK-LABEL: @signed_reverse_loop_n_to_lower_limit(
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[range_start:%.*]] = add i32 %n, -1
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; CHECK-NEXT: [[first_iteration_check:%.*]] = icmp ult i32 [[range_start]], %length
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; CHECK-NEXT: [[no_wrap_check:%.*]] = icmp sge i32 %lowerlimit, 1
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; CHECK-NEXT: [[wide_cond:%.*]] = and i1 [[first_iteration_check]], [[no_wrap_check]]
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loop.preheader:
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br label %loop
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; CHECK: loop:
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 [[wide_cond]], i32 9) [ "deopt"() ]
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ %n, %loop.preheader ]
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%i.next = add nsw i32 %i, -1
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%within.bounds = icmp ult i32 %i.next, %length
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %i.next to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%continue = icmp sgt i32 %i, %lowerlimit
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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define i32 @unsigned_reverse_loop_n_to_lower_limit(i32* %array, i32 %length, i32 %n, i32 %lowerlimit) {
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; CHECK-LABEL: @unsigned_reverse_loop_n_to_lower_limit(
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[range_start:%.*]] = add i32 %n, -1
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; CHECK-NEXT: [[first_iteration_check:%.*]] = icmp ult i32 [[range_start]], %length
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; CHECK-NEXT: [[no_wrap_check:%.*]] = icmp uge i32 %lowerlimit, 1
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; CHECK-NEXT: [[wide_cond:%.*]] = and i1 [[first_iteration_check]], [[no_wrap_check]]
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loop.preheader:
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br label %loop
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; CHECK: loop:
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 [[wide_cond]], i32 9) [ "deopt"() ]
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ %n, %loop.preheader ]
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%i.next = add nsw i32 %i, -1
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%within.bounds = icmp ult i32 %i.next, %length
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %i.next to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%continue = icmp ugt i32 %i, %lowerlimit
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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; if we predicated the loop, the guard will definitely fail and we will
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; deoptimize early on.
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define i32 @unsigned_reverse_loop_n_to_0(i32* %array, i32 %length, i32 %n, i32 %lowerlimit) {
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; CHECK-LABEL: @unsigned_reverse_loop_n_to_0(
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[range_start:%.*]] = add i32 %n, -1
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; CHECK-NEXT: [[first_iteration_check:%.*]] = icmp ult i32 [[range_start]], %length
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; CHECK-NEXT: [[wide_cond:%.*]] = and i1 [[first_iteration_check]], false
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loop.preheader:
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br label %loop
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; CHECK: loop:
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 [[wide_cond]], i32 9) [ "deopt"() ]
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ %n, %loop.preheader ]
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%i.next = add nsw i32 %i, -1
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%within.bounds = icmp ult i32 %i.next, %length
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %i.next to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%continue = icmp ugt i32 %i, 0
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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; do not loop predicate when the range has step -1 and latch has step 1.
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define i32 @reverse_loop_range_step_increment(i32 %n, i32* %array, i32 %length) {
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; CHECK-LABEL: @reverse_loop_range_step_increment(
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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loop.preheader:
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br label %loop
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; CHECK: loop:
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; CHECK: llvm.experimental.guard(i1 %within.bounds, i32 9)
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ %n, %loop.preheader ]
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%irc = phi i32 [ %i.inc, %loop ], [ 1, %loop.preheader ]
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%i.inc = add nuw nsw i32 %irc, 1
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%within.bounds = icmp ult i32 %irc, %length
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %irc to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%i.next = add nsw i32 %i, -1
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%loop.acc.next = add i32 %loop.acc, %array.i
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%continue = icmp ugt i32 %i, 65534
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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define i32 @signed_reverse_loop_n_to_lower_limit_equal(i32* %array, i32 %length, i32 %n, i32 %lowerlimit) {
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; CHECK-LABEL: @signed_reverse_loop_n_to_lower_limit_equal(
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[range_start:%.*]] = add i32 %n, -1
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; CHECK-NEXT: [[first_iteration_check:%.*]] = icmp ult i32 [[range_start]], %length
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; CHECK-NEXT: [[no_wrap_check:%.*]] = icmp sgt i32 %lowerlimit, 1
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; CHECK-NEXT: [[wide_cond:%.*]] = and i1 [[first_iteration_check]], [[no_wrap_check]]
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loop.preheader:
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br label %loop
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; CHECK: loop:
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 [[wide_cond]], i32 9) [ "deopt"() ]
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ %n, %loop.preheader ]
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%i.next = add nsw i32 %i, -1
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%within.bounds = icmp ult i32 %i.next, %length
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %i.next to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%continue = icmp sge i32 %i, %lowerlimit
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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define i32 @unsigned_reverse_loop_n_to_lower_limit_equal(i32* %array, i32 %length, i32 %n, i32 %lowerlimit) {
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; CHECK-LABEL: @unsigned_reverse_loop_n_to_lower_limit_equal(
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[range_start:%.*]] = add i32 %n, -1
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; CHECK-NEXT: [[first_iteration_check:%.*]] = icmp ult i32 [[range_start]], %length
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; CHECK-NEXT: [[no_wrap_check:%.*]] = icmp ugt i32 %lowerlimit, 1
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; CHECK-NEXT: [[wide_cond:%.*]] = and i1 [[first_iteration_check]], [[no_wrap_check]]
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loop.preheader:
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br label %loop
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; CHECK: loop:
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 [[wide_cond]], i32 9) [ "deopt"() ]
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ %n, %loop.preheader ]
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%i.next = add nsw i32 %i, -1
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%within.bounds = icmp ult i32 %i.next, %length
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %i.next to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%continue = icmp uge i32 %i, %lowerlimit
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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; if we predicated the loop, the guard will definitely fail and we will
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; deoptimize early on.
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define i32 @unsigned_reverse_loop_n_to_1(i32* %array, i32 %length, i32 %n, i32 %lowerlimit) {
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; CHECK-LABEL: @unsigned_reverse_loop_n_to_1(
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[range_start:%.*]] = add i32 %n, -1
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; CHECK-NEXT: [[first_iteration_check:%.*]] = icmp ult i32 [[range_start]], %length
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; CHECK-NEXT: [[wide_cond:%.*]] = and i1 [[first_iteration_check]], false
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loop.preheader:
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br label %loop
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; CHECK: loop:
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 [[wide_cond]], i32 9) [ "deopt"() ]
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ %n, %loop.preheader ]
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%i.next = add nsw i32 %i, -1
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%within.bounds = icmp ult i32 %i.next, %length
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %i.next to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%continue = icmp uge i32 %i, 1
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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