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llvm-mirror/test/Transforms/LoopUnroll/pr33437.ll
Nikita Popov a17845f6c0 [LoopUnroll] Separate peeling from unrolling
Loop peeling is currently performed as part of UnrollLoop().
Outside test scenarios, it is always performed with an unroll
count of 1. This means that unrolling doesn't actually do anything
apart from performing post-unroll simplification.

When testing, it's currently possible to specify both an explicit
peel count and an explicit unroll count. This doesn't perform any
sensible operation and may result in miscompiles, see
https://bugs.llvm.org/show_bug.cgi?id=45939.

This patch moves peeling from UnrollLoop() into tryToUnrollLoop(),
so that peeling does not also perform a susequent unroll. We only
run the post-unroll simplifications. Specifying both an explicit
peel count and unroll count is forbidden.

In the future, we may want to support both (non-PGO) peeling a
loop and unrolling it, but this needs to be done by first performing
the peel and then recalculating unrolling heuristics on a now
possibly analyzable loop.

Differential Revision: https://reviews.llvm.org/D103362
2021-06-05 10:32:00 +02:00

94 lines
3.0 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -loop-unroll -unroll-peel-count=1 < %s | FileCheck %s
declare zeroext i8 @patatino()
define fastcc void @tinky() {
; CHECK-LABEL: @tinky(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[NEXT:%.*]]
; CHECK: loopexit.loopexit:
; CHECK-NEXT: br label [[LOOPEXIT:%.*]]
; CHECK: loopexit:
; CHECK-NEXT: ret void
; CHECK: next:
; CHECK-NEXT: br label [[LOOP_PEEL_BEGIN:%.*]]
; CHECK: loop.peel.begin:
; CHECK-NEXT: br label [[LOOP_PEEL:%.*]]
; CHECK: loop.peel:
; CHECK-NEXT: [[CALL593_PEEL:%.*]] = tail call zeroext i8 @patatino()
; CHECK-NEXT: br i1 false, label [[LOOP_PEEL_NEXT:%.*]], label [[LOOPEXIT]]
; CHECK: loop.peel.next:
; CHECK-NEXT: br label [[LOOP_PEEL_NEXT1:%.*]]
; CHECK: loop.peel.next1:
; CHECK-NEXT: br label [[NEXT_PEEL_NEWPH:%.*]]
; CHECK: next.peel.newph:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[CALL593:%.*]] = tail call zeroext i8 @patatino()
; CHECK-NEXT: br i1 false, label [[LOOP]], label [[LOOPEXIT_LOOPEXIT:%.*]], !llvm.loop [[LOOP0:![0-9]+]]
;
entry:
br label %next
loopexit:
ret void
next:
br label %loop
loop:
%a = phi i8 [ undef, %next ], [ %call593, %loop ]
%b = phi i32 [ 0, %next ], [ 1, %loop ]
%call593 = tail call zeroext i8 @patatino()
br i1 false, label %loop, label %loopexit
}
define void @tinky2() {
; CHECK-LABEL: @tinky2(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[NEXT:%.*]]
; CHECK: loopexit.loopexit:
; CHECK-NEXT: br label [[LOOPEXIT:%.*]]
; CHECK: loopexit:
; CHECK-NEXT: ret void
; CHECK: next:
; CHECK-NEXT: br label [[LOOP_PEEL_BEGIN:%.*]]
; CHECK: loop.peel.begin:
; CHECK-NEXT: br label [[LOOP_PEEL:%.*]]
; CHECK: loop.peel:
; CHECK-NEXT: [[CALL593_PEEL:%.*]] = tail call zeroext i8 @patatino()
; CHECK-NEXT: [[B_NEXT_PEEL:%.*]] = add i32 0, 1
; CHECK-NEXT: [[COND_PEEL:%.*]] = icmp ne i32 0, 30
; CHECK-NEXT: br i1 [[COND_PEEL]], label [[LOOP_PEEL_NEXT:%.*]], label [[LOOPEXIT]]
; CHECK: loop.peel.next:
; CHECK-NEXT: br label [[LOOP_PEEL_NEXT1:%.*]]
; CHECK: loop.peel.next1:
; CHECK-NEXT: br label [[NEXT_PEEL_NEWPH:%.*]]
; CHECK: next.peel.newph:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[B:%.*]] = phi i32 [ [[B_NEXT_PEEL]], [[NEXT_PEEL_NEWPH]] ], [ [[B_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT: [[CALL593:%.*]] = tail call zeroext i8 @patatino()
; CHECK-NEXT: [[B_NEXT]] = add nuw nsw i32 [[B]], 1
; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[B]], 30
; CHECK-NEXT: br i1 [[COND]], label [[LOOP]], label [[LOOPEXIT_LOOPEXIT:%.*]], !llvm.loop [[LOOP3:![0-9]+]]
;
entry:
br label %next
loopexit:
ret void
next:
br label %loop
loop:
%a = phi i8 [ undef, %next ], [ %call593, %loop ]
%b = phi i32 [ 0, %next ], [ %b.next, %loop ]
%call593 = tail call zeroext i8 @patatino()
%b.next = add i32 %b, 1
%cond = icmp ne i32 %b, 30
br i1 %cond, label %loop, label %loopexit
}