8cf5b69f69
As reported on https://bugs.llvm.org/show_bug.cgi?id=51020, the guard widening pass doesn't preserve MemorySSA, so it can no longer be scheduled in the same loop pass manager as LICM. However, the loop-schedule.ll test indicates that this is supposed to work. Fix this by preserving MemorySSA if available, as this seems to be trivial in this case (we only need to drop the memory access for the removed guards). Differential Revision: https://reviews.llvm.org/D108386
70 lines
2.4 KiB
LLVM
70 lines
2.4 KiB
LLVM
; RUN: opt -S -licm -loop-guard-widening -licm -verify-memoryssa -debug-pass=Structure -enable-new-pm=0 < %s 2>&1 | FileCheck %s --check-prefixes=LPM,CHECK
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; RUN: opt -S -passes='licm,guard-widening,licm' -verify-memoryssa -debug-pass-manager < %s 2>&1 | FileCheck %s --check-prefixes=NPM,CHECK
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; Main point of this test is to check the scheduling -- there should be
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; no analysis passes needed between LICM and LoopGuardWidening
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; LPM: Loop Pass Manager
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; LPM: Loop Invariant Code Motion
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; LPM-NEXT: Widen guards (within a single loop, as a loop pass)
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; LPM-NEXT: Loop Invariant Code Motion
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; NPM: LICMPass
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; NPM-NEXT: GuardWideningPass
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; NPM-NEXT: LICMPass
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declare void @llvm.experimental.guard(i1,...)
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define void @iter(i32 %a, i32 %b, i1* %c_p) {
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; CHECK-LABEL: @iter
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; CHECK: %cond_0 = icmp ult i32 %a, 10
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; CHECK: %cond_1 = icmp ult i32 %b, 10
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; CHECK: %wide.chk = and i1 %cond_0, %cond_1
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 %wide.chk) [ "deopt"() ]
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; CHECK-LABEL: loop:
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entry:
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%cond_0 = icmp ult i32 %a, 10
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call void (i1, ...) @llvm.experimental.guard(i1 %cond_0) [ "deopt"() ]
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br label %loop
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loop: ; preds = %loop.preheader, %loop
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%cond_1 = icmp ult i32 %b, 10
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call void (i1, ...) @llvm.experimental.guard(i1 %cond_1) [ "deopt"() ]
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%cnd = load i1, i1* %c_p
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br i1 %cnd, label %loop, label %leave.loopexit
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leave.loopexit: ; preds = %loop
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br label %leave
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leave: ; preds = %leave.loopexit, %entry
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ret void
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}
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define void @within_loop(i32 %a, i32 %b, i1* %c_p) {
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; CHECK-LABEL: @within_loop
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; CHECK: %cond_0 = icmp ult i32 %a, 10
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; CHECK: %cond_1 = icmp ult i32 %b, 10
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; CHECK: %wide.chk = and i1 %cond_0, %cond_1
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 %wide.chk) [ "deopt"() ]
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; CHECK-LABEL: loop:
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entry:
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br label %loop
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loop: ; preds = %loop.preheader, %loop
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%cond_0 = icmp ult i32 %a, 10
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call void (i1, ...) @llvm.experimental.guard(i1 %cond_0) [ "deopt"() ]
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%cond_1 = icmp ult i32 %b, 10
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call void (i1, ...) @llvm.experimental.guard(i1 %cond_1) [ "deopt"() ]
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%cnd = load i1, i1* %c_p
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br i1 %cnd, label %loop, label %leave.loopexit
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leave.loopexit: ; preds = %loop
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br label %leave
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leave: ; preds = %leave.loopexit, %entry
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ret void
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}
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