aea2a14736
FullLoopUnroll was performing runtime unrolling in certain cases when '#pragma unroll' was specified. Patch to fix this by introducing new parameter to tryToUnrollLoop() to differentiate between LoopUnrollPass and FullLoopUnrollPass. Based on the discussion here (https://discourse.llvm.org/t/loop-unroller-fails-to-unroll-loop/69834) Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D148071
73 lines
1.9 KiB
LLVM
73 lines
1.9 KiB
LLVM
; This test checks that nested loops are revisited in various scenarios when
|
|
; unrolling. Note that if we ever start doing outer loop peeling a test case
|
|
; for that should be added here.
|
|
;
|
|
; RUN: opt < %s -disable-output -debug-pass-manager 2>&1 \
|
|
; RUN: -passes='require<opt-remark-emit>,loop(loop-unroll-full)' \
|
|
; RUN: | FileCheck %s
|
|
;
|
|
; Basic test is fully unrolled and we revisit the post-unroll new sibling
|
|
; loops, including the ones that used to be child loops.
|
|
define void @full_unroll(ptr %ptr) {
|
|
; CHECK-LABEL: OptimizationRemarkEmitterAnalysis on full_unroll
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
|
|
entry:
|
|
br label %l0
|
|
|
|
l0:
|
|
%cond.0 = load volatile i1, ptr %ptr
|
|
br i1 %cond.0, label %l0.0.ph, label %exit
|
|
|
|
l0.0.ph:
|
|
br label %l0.0
|
|
|
|
l0.0:
|
|
%iv = phi i32 [ %iv.next, %l0.0.latch ], [ 0, %l0.0.ph ]
|
|
%iv.next = add i32 %iv, 1
|
|
br label %l0.0.0.ph
|
|
|
|
l0.0.0.ph:
|
|
br label %l0.0.0
|
|
|
|
l0.0.0:
|
|
%cond.0.0.0 = load volatile i1, ptr %ptr
|
|
br i1 %cond.0.0.0, label %l0.0.0, label %l0.0.1.ph
|
|
; CHECK: LoopFullUnrollPass on l0.0.0
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
|
|
l0.0.1.ph:
|
|
br label %l0.0.1
|
|
|
|
l0.0.1:
|
|
%cond.0.0.1 = load volatile i1, ptr %ptr
|
|
br i1 %cond.0.0.1, label %l0.0.1, label %l0.0.latch
|
|
; CHECK: LoopFullUnrollPass on l0.0.1
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
|
|
l0.0.latch:
|
|
%cmp = icmp slt i32 %iv.next, 2
|
|
br i1 %cmp, label %l0.0, label %l0.latch
|
|
; CHECK: LoopFullUnrollPass on l0.0
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
;
|
|
; Unrolling occurs, so we visit what were the inner loops twice over. First we
|
|
; visit their clones, and then we visit the original loops re-parented.
|
|
; CHECK: LoopFullUnrollPass on l0.0.1.1
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
; CHECK: LoopFullUnrollPass on l0.0.0.1
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
; CHECK: LoopFullUnrollPass on l0.0.1
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
; CHECK: LoopFullUnrollPass on l0.0.0
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
|
|
l0.latch:
|
|
br label %l0
|
|
; CHECK: LoopFullUnrollPass on l0
|
|
; CHECK-NOT: LoopFullUnrollPass
|
|
|
|
exit:
|
|
ret void
|
|
}
|