137 lines
4.6 KiB
LLVM
137 lines
4.6 KiB
LLVM
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; RUN: opt -verify-loop-info -irce-print-changed-loops -irce -S < %s 2>&1 | FileCheck %s
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; RUN: opt -verify-loop-info -irce-print-changed-loops -passes='require<branch-prob>,irce' -S < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1"
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target triple = "x86_64-unknown-linux-gnu"
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; IRCE should fail here because the preheader's exiting value is a phi from the
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; loop, and this value cannot be expanded at loop's preheader.
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; CHECK-NOT: irce: in function test_01: constrained Loop
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; CHECK-NOT: irce: in function test_02: constrained Loop
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; CHECK-LABEL: irce: in function test_03: constrained Loop
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define void @test_01() {
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; CHECK-NOT: irce: in function test_01: constrained Loop
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; CHECK-LABEL: test_01
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; CHECK-NOT: preloop
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; CHECK-NOT: postloop
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; CHECK-NOT: br i1 false
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; CHECK-NOT: br i1 true
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entry:
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br label %loop
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exit: ; preds = %guarded, %loop
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ret void
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loop: ; preds = %guarded, %entry
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%iv = phi i64 [ 380, %entry ], [ %limit, %guarded ]
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%bad_phi = phi i32 [ 3, %entry ], [ %bad_phi.next, %guarded ]
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%bad_phi.next = add nuw nsw i32 %bad_phi, 1
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%iv.next = add nuw nsw i64 %iv, 1
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%rc = icmp slt i64 %iv.next, 5
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br i1 %rc, label %guarded, label %exit
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guarded:
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%limit = add nsw i64 %iv, -1
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%tmp5 = add nuw nsw i32 %bad_phi, 8
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%tmp6 = zext i32 %tmp5 to i64
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%tmp7 = icmp eq i64 %limit, %tmp6
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br i1 %tmp7, label %exit, label %loop
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}
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; This test should fail because we are unable to prove that the division is
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; safe to expand it to preheader: if we exit by maybe_exit condition, it is
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; unsafe to execute it there.
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define void @test_02(i64* %p1, i64* %p2, i1 %maybe_exit) {
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; CHECK-LABEL: test_02
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; CHECK-NOT: preloop
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; CHECK-NOT: postloop
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; CHECK-NOT: br i1 false
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; CHECK-NOT: br i1 true
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entry:
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%num = load i64, i64* %p1, align 4, !range !0
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%denom = load i64, i64* %p2, align 4, !range !0
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br label %loop
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exit: ; preds = %guarded, %loop
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ret void
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loop: ; preds = %guarded, %entry
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %guarded ]
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%iv.next = add nuw nsw i64 %iv, 1
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br i1 %maybe_exit, label %range_check, label %exit
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range_check:
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%div_result = udiv i64 %num, %denom
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%rc = icmp slt i64 %iv.next, %div_result
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br i1 %rc, label %guarded, label %exit
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guarded:
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%gep = getelementptr i64, i64* %p1, i64 %iv.next
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%loaded = load i64, i64* %gep, align 4
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%tmp7 = icmp slt i64 %iv.next, 1000
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br i1 %tmp7, label %loop, label %exit
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}
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define void @test_03(i64* %p1, i64* %p2, i1 %maybe_exit) {
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; Show that IRCE would hit test_02 if the division was safe (denom not zero).
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; CHECK-LABEL: test_03
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; CHECK: entry:
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; CHECK-NEXT: %num = load i64, i64* %p1, align 4
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; CHECK-NEXT: [[DIV:%[^ ]+]] = udiv i64 %num, 13
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; CHECK-NEXT: [[DIV_MINUS_1:%[^ ]+]] = add nsw i64 [[DIV]], -1
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; CHECK-NEXT: [[COMP1:%[^ ]+]] = icmp sgt i64 [[DIV_MINUS_1]], 0
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; CHECK-NEXT: %exit.mainloop.at = select i1 [[COMP1]], i64 [[DIV_MINUS_1]], i64 0
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; CHECK-NEXT: [[COMP2:%[^ ]+]] = icmp slt i64 0, %exit.mainloop.at
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; CHECK-NEXT: br i1 [[COMP2]], label %loop.preheader, label %main.pseudo.exit
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; CHECK-NOT: preloop
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; CHECK: loop:
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; CHECK-NEXT: %iv = phi i64 [ %iv.next, %guarded ], [ 0, %loop.preheader ]
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; CHECK-NEXT: %iv.next = add nuw nsw i64 %iv, 1
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; CHECK-NEXT: %rc = icmp slt i64 %iv.next, %div_result
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; CHECK-NEXT: %or.cond = and i1 %maybe_exit, true
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; CHECK-NEXT: br i1 %or.cond, label %guarded, label %exit.loopexit1
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; CHECK: guarded:
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; CHECK-NEXT: %gep = getelementptr i64, i64* %p1, i64 %iv.next
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; CHECK-NEXT: %loaded = load i64, i64* %gep, align 4
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; CHECK-NEXT: %tmp7 = icmp slt i64 %iv.next, 1000
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; CHECK-NEXT: [[EXIT_MAIN_LOOP:%[^ ]+]] = icmp slt i64 %iv.next, %exit.mainloop.at
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; CHECK-NEXT: br i1 [[EXIT_MAIN_LOOP]], label %loop, label %main.exit.selector
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; CHECK: postloop
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entry:
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%num = load i64, i64* %p1, align 4, !range !0
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br label %loop
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exit: ; preds = %guarded, %loop
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ret void
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loop: ; preds = %guarded, %entry
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %guarded ]
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%iv.next = add nuw nsw i64 %iv, 1
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br i1 %maybe_exit, label %range_check, label %exit
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range_check:
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%div_result = udiv i64 %num, 13
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%rc = icmp slt i64 %iv.next, %div_result
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br i1 %rc, label %guarded, label %exit
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guarded:
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%gep = getelementptr i64, i64* %p1, i64 %iv.next
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%loaded = load i64, i64* %gep, align 4
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%tmp7 = icmp slt i64 %iv.next, 1000
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br i1 %tmp7, label %loop, label %exit
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}
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!0 = !{i64 0, i64 100}
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