derek.holloway
7502bf64a4
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75 lines
3.3 KiB
LLVM
75 lines
3.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt < %s -passes=gvn -enable-load-pre -S | FileCheck %s --check-prefixes=CHECK,MDEP
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; RUN: opt < %s -passes='gvn<memoryssa>' -enable-load-pre -S | FileCheck %s --check-prefixes=CHECK,MSSA
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; RUN: opt < %s -passes="gvn<load-pre>" -enable-load-pre=false -S | FileCheck %s
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; This testcase assumed we'll PRE the load into %for.cond, but we don't actually
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; verify that doing so is safe. If there didn't _happen_ to be a load in
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; %for.end, we would actually be lengthening the execution on some paths, and
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; we were never actually checking that case. Now we actually do perform some
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; conservative checking to make sure we don't make paths longer, but we don't
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; currently get this case, which we got lucky on previously.
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;
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; Now that that faulty assumption is corrected, test that we DON'T incorrectly
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; hoist the load. Doing the right thing for the wrong reasons is still a bug.
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@p = external global i32
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define i32 @f(i32 %n) nounwind {
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; CHECK-LABEL: define i32 @f(
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; CHECK-SAME: i32 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: [[ENTRY:.*]]:
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; CHECK-NEXT: br label %[[FOR_COND:.*]]
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; CHECK: [[FOR_COND]]:
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; CHECK-NEXT: [[I_0:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[INDVAR_NEXT:%.*]], %[[FOR_INC:.*]] ]
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I_0]], [[N]]
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; CHECK-NEXT: br i1 [[CMP]], label %[[FOR_BODY:.*]], label %[[FOR_COND_FOR_END_CRIT_EDGE:.*]]
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; CHECK: [[FOR_COND_FOR_END_CRIT_EDGE]]:
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; CHECK-NEXT: [[TMP9_PRE:%.*]] = load i32, ptr @p, align 4
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; CHECK-NEXT: br label %[[FOR_END:.*]]
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; CHECK: [[FOR_BODY]]:
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; CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr @p, align 4
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; CHECK-NEXT: [[DEC:%.*]] = add i32 [[TMP3]], -1
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; CHECK-NEXT: store i32 [[DEC]], ptr @p, align 4
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; CHECK-NEXT: [[CMP6:%.*]] = icmp slt i32 [[DEC]], 0
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; CHECK-NEXT: br i1 [[CMP6]], label %[[FOR_BODY_FOR_END_CRIT_EDGE:.*]], label %[[FOR_INC]]
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; CHECK: [[FOR_BODY_FOR_END_CRIT_EDGE]]:
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; CHECK-NEXT: br label %[[FOR_END]]
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; CHECK: [[FOR_INC]]:
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; CHECK-NEXT: [[INDVAR_NEXT]] = add i32 [[I_0]], 1
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; CHECK-NEXT: br label %[[FOR_COND]]
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; CHECK: [[FOR_END]]:
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; CHECK-NEXT: [[TMP9:%.*]] = phi i32 [ [[DEC]], %[[FOR_BODY_FOR_END_CRIT_EDGE]] ], [ [[TMP9_PRE]], %[[FOR_COND_FOR_END_CRIT_EDGE]] ]
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; CHECK-NEXT: ret i32 [[TMP9]]
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;
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %indvar.next, %for.inc ] ; <i32> [#uses=2]
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%cmp = icmp slt i32 %i.0, %n ; <i1> [#uses=1]
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br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
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for.cond.for.end_crit_edge: ; preds = %for.cond
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br label %for.end
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for.body: ; preds = %for.cond
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%tmp3 = load i32, ptr @p ; <i32> [#uses=1]
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%dec = add i32 %tmp3, -1 ; <i32> [#uses=2]
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store i32 %dec, ptr @p
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%cmp6 = icmp slt i32 %dec, 0 ; <i1> [#uses=1]
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br i1 %cmp6, label %for.body.for.end_crit_edge, label %for.inc
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for.body.for.end_crit_edge: ; preds = %for.body
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br label %for.end
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for.inc: ; preds = %for.body
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%indvar.next = add i32 %i.0, 1 ; <i32> [#uses=1]
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br label %for.cond
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for.end: ; preds = %for.body.for.end_crit_edge, %for.cond.for.end_crit_edge
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%tmp9 = load i32, ptr @p ; <i32> [#uses=1]
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ret i32 %tmp9
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}
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;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
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; MDEP: {{.*}}
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; MSSA: {{.*}}
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