097ef69182
This patch teaches LICM to hoist guards from the loop if they are guaranteed to execute and if there are no side effects that could prevent that. Differential Revision: https://reviews.llvm.org/D50501 Reviewed By: reames llvm-svn: 340256
65 lines
2.2 KiB
LLVM
65 lines
2.2 KiB
LLVM
; RUN: opt -S -licm -loop-guard-widening -licm -debug-pass=Structure < %s 2>&1 | FileCheck %s
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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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; CHECK: Loop Pass Manager
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; CHECK: Loop Invariant Code Motion
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; CHECK: Widen guards (within a single loop, as a loop pass)
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; CHECK: Loop Invariant Code Motion
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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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