c554c5e159
Last we looked at this and couldn't come up with a reason to change it, but with a pragma for full loop unrolling we bypass every other loop unroll and then fail to fully unroll a loop when the pragma is set. Move the OnlyWhenForced out of the check and into the initialization of the full unroll pass in the new pass manager. This doesn't show up with the old pass manager. Add a new option to opt so that we can turn off loop unrolling manually since this is a difference between clang and opt. Tested with check-clang and check-llvm.
78 lines
2.5 KiB
LLVM
78 lines
2.5 KiB
LLVM
; RUN: opt -passes='default<O1>' -disable-verify --mtriple x86_64-pc-linux-gnu -new-pm-disable-loop-unrolling=true \
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; RUN: -S -o - %s | FileCheck %s
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; This checks that the loop full unroller will fire in the new pass manager
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; when forced via #pragma in the source (or annotation in the code).
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; We don't end up deleting the loop, merely turning it infinite, but we remove
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; everything inside of it so check for the loop structure and absence of
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; conditional branches.
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; CHECK-LABEL: bb
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; CHECK: br label
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; CHECK-NOT: br i1
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; CHECK: br label
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; CHECK-NOT: br i1
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; Function Attrs: noinline nounwind optnone uwtable
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define void @foo() #0 {
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bb:
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%tmp = alloca [5 x i32*], align 16
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%tmp1 = alloca i32, align 4
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%tmp2 = alloca i32, align 4
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store i32 5, i32* %tmp1, align 4
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br label %bb3
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bb3: ; preds = %bb23, %bb
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%tmp4 = load i32, i32* %tmp1, align 4
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%tmp5 = icmp ne i32 %tmp4, 0
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br i1 %tmp5, label %bb6, label %bb24
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bb6: ; preds = %bb3
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store i32 0, i32* %tmp2, align 4
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br label %bb7
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bb7: ; preds = %bb20, %bb6
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%tmp8 = load i32, i32* %tmp2, align 4
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%tmp9 = icmp slt i32 %tmp8, 5
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br i1 %tmp9, label %bb10, label %bb23
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bb10: ; preds = %bb7
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%tmp11 = load i32, i32* %tmp2, align 4
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%tmp12 = sext i32 %tmp11 to i64
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%tmp13 = getelementptr inbounds [5 x i32*], [5 x i32*]* %tmp, i64 0, i64 %tmp12
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%tmp14 = load i32*, i32** %tmp13, align 8
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%tmp15 = icmp ne i32* %tmp14, null
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br i1 %tmp15, label %bb16, label %bb19
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bb16: ; preds = %bb10
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%tmp17 = load i32, i32* %tmp1, align 4
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%tmp18 = add nsw i32 %tmp17, -1
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store i32 %tmp18, i32* %tmp1, align 4
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br label %bb19
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bb19: ; preds = %bb16, %bb10
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br label %bb20
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bb20: ; preds = %bb19
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%tmp21 = load i32, i32* %tmp2, align 4
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%tmp22 = add nsw i32 %tmp21, 1
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store i32 %tmp22, i32* %tmp2, align 4
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br label %bb7, !llvm.loop !1
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bb23: ; preds = %bb7
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br label %bb3
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bb24: ; preds = %bb3
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ret void
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}
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attributes #0 = { noinline nounwind optnone uwtable }
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!llvm.module.flags = !{!0}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = distinct !{!1, !2}
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!2 = !{!"llvm.loop.unroll.full"}
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