forked from OSchip/llvm-project
434 lines
11 KiB
LLVM
434 lines
11 KiB
LLVM
; This test creates a monster SCC with a very pernicious call graph. It builds
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; a cycle of cross-connected pairs of functions with interesting inlining
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; decisions throughout, but ultimately trivial code complexity.
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;
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; Typically, a greedy approach to inlining works well for bottom-up inliners
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; such as LLVM's. However, there is no way to be bottom-up over an SCC: it's
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; a cycle! Greedily inlining as much as possible into each function of this
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; *SCC* will have the disasterous effect of inlining all N-1 functions into the
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; first one visited, N-2 functions into the second one visited, N-3 into the
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; third, and so on. This is because until inlining occurs, each function in
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; isolation appears to be an excellent inline candidate.
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;
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; Note that the exact number of calls in each function doesn't really matter.
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; It is mostly a function of cost thresholds and visit order. Because this is an
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; SCC there is no "right" or "wrong" answer here as long as no function blows up
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; to be *huge*. The specific concerning pattern is if one or more functions get
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; more than 16 calls in them.
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;
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; This test is extracted from the following C++ program compiled with Clang.
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; The IR is simplified with SROA, instcombine, and simplify-cfg. Then C++
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; linkage stuff, attributes, target specific things, metadata and comments were
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; removed. The order of the fuctions is also made more predictable than Clang's
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; output order.
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;
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; void g(int);
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;
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; template <bool K, int N> void f(bool *B, bool *E) {
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; if (K)
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; g(N);
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; if (B == E)
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; return;
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; if (*B)
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; f<true, N + 1>(B + 1, E);
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; else
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; f<false, N + 1>(B + 1, E);
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; }
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; template <> void f<false, MAX>(bool *B, bool *E) { return f<false, 0>(B, E); }
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; template <> void f<true, MAX>(bool *B, bool *E) { return f<true, 0>(B, E); }
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;
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; void test(bool *B, bool *E) { f<false, 0>(B, E); }
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;
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; RUN: opt -S < %s -inline -inline-threshold=150 | FileCheck %s --check-prefixes=CHECK,OLD
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; RUN: opt -S < %s -passes=inline -inline-threshold=150 | FileCheck %s --check-prefixes=CHECK,NEW
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; RUN: opt -S < %s -passes=inliner-wrapper -inline-threshold=150 | FileCheck %s --check-prefixes=CHECK,NEW
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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declare void @_Z1gi(i32)
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; CHECK-LABEL: define void @_Z1fILb0ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi2EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi2EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi1EEvPbS0_(
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; OLD-NOT: call
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi2EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi2EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi2EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi2EEvPbS0_(
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; NEW-NOT: call
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define void @_Z1fILb0ELi0EEvPbS0_(i8* %B, i8* %E) {
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entry:
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%cmp = icmp eq i8* %B, %E
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br i1 %cmp, label %if.end3, label %if.end
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if.end:
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%0 = load i8, i8* %B, align 1
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%tobool = icmp eq i8 %0, 0
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%add.ptr2 = getelementptr inbounds i8, i8* %B, i64 1
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br i1 %tobool, label %if.else, label %if.then1
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if.then1:
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call void @_Z1fILb1ELi1EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.else:
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call void @_Z1fILb0ELi1EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.end3:
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi2EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi2EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi1EEvPbS0_(
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; OLD-NOT: call
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi1EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi2EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi2EEvPbS0_(
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; NEW-NOT: call
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define void @_Z1fILb1ELi0EEvPbS0_(i8* %B, i8* %E) {
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entry:
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call void @_Z1gi(i32 0)
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%cmp = icmp eq i8* %B, %E
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br i1 %cmp, label %if.end3, label %if.end
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if.end:
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%0 = load i8, i8* %B, align 1
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%tobool = icmp eq i8 %0, 0
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%add.ptr2 = getelementptr inbounds i8, i8* %B, i64 1
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br i1 %tobool, label %if.else, label %if.then1
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if.then1:
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call void @_Z1fILb1ELi1EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.else:
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call void @_Z1fILb0ELi1EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.end3:
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb0ELi1EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi2EEvPbS0_(
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; OLD-NOT: call
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi2EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi3EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi3EEvPbS0_(
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; NEW-NOT: call
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define void @_Z1fILb0ELi1EEvPbS0_(i8* %B, i8* %E) {
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entry:
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%cmp = icmp eq i8* %B, %E
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br i1 %cmp, label %if.end3, label %if.end
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if.end:
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%0 = load i8, i8* %B, align 1
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%tobool = icmp eq i8 %0, 0
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%add.ptr2 = getelementptr inbounds i8, i8* %B, i64 1
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br i1 %tobool, label %if.else, label %if.then1
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if.then1:
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call void @_Z1fILb1ELi2EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.else:
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call void @_Z1fILb0ELi2EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.end3:
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb1ELi1EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi2EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi2EEvPbS0_(
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; OLD-NOT: call
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi3EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi3EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi3EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi3EEvPbS0_(
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; NEW-NOT: call
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define void @_Z1fILb1ELi1EEvPbS0_(i8* %B, i8* %E) {
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entry:
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call void @_Z1gi(i32 1)
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%cmp = icmp eq i8* %B, %E
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; CHECK-NOT: call
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br i1 %cmp, label %if.end3, label %if.end
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if.end:
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%0 = load i8, i8* %B, align 1
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%tobool = icmp eq i8 %0, 0
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%add.ptr2 = getelementptr inbounds i8, i8* %B, i64 1
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br i1 %tobool, label %if.else, label %if.then1
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if.then1:
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call void @_Z1fILb1ELi2EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.else:
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call void @_Z1fILb0ELi2EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.end3:
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb0ELi2EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi0EEvPbS0_(
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; OLD-NOT: call
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi0EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi0EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi4EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi4EEvPbS0_(
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; NEW-NOT: call
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define void @_Z1fILb0ELi2EEvPbS0_(i8* %B, i8* %E) {
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entry:
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%cmp = icmp eq i8* %B, %E
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br i1 %cmp, label %if.end3, label %if.end
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if.end:
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%0 = load i8, i8* %B, align 1
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%tobool = icmp eq i8 %0, 0
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%add.ptr2 = getelementptr inbounds i8, i8* %B, i64 1
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br i1 %tobool, label %if.else, label %if.then1
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if.then1:
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call void @_Z1fILb1ELi3EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.else:
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call void @_Z1fILb0ELi3EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.end3:
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb1ELi2EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1gi(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi0EEvPbS0_(
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; OLD-NOT: call
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi4EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi4EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi4EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi4EEvPbS0_(
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; NEW-NOT: call
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define void @_Z1fILb1ELi2EEvPbS0_(i8* %B, i8* %E) {
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entry:
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call void @_Z1gi(i32 2)
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%cmp = icmp eq i8* %B, %E
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br i1 %cmp, label %if.end3, label %if.end
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if.end:
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%0 = load i8, i8* %B, align 1
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%tobool = icmp eq i8 %0, 0
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%add.ptr2 = getelementptr inbounds i8, i8* %B, i64 1
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br i1 %tobool, label %if.else, label %if.then1
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if.then1:
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call void @_Z1fILb1ELi3EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.else:
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call void @_Z1fILb0ELi3EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.end3:
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb0ELi3EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb0ELi0EEvPbS0_(
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; OLD-NOT: call
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi1EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi1EEvPbS0_(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb0ELi0EEvPbS0_(
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; NEW-NOT: call
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define void @_Z1fILb0ELi3EEvPbS0_(i8* %B, i8* %E) {
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entry:
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%cmp = icmp eq i8* %B, %E
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br i1 %cmp, label %if.end3, label %if.end
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if.end:
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%0 = load i8, i8* %B, align 1
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%tobool = icmp eq i8 %0, 0
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%add.ptr2 = getelementptr inbounds i8, i8* %B, i64 1
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br i1 %tobool, label %if.else, label %if.then1
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if.then1:
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call void @_Z1fILb1ELi4EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.else:
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call void @_Z1fILb0ELi4EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.end3:
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb1ELi3EEvPbS0_(
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; CHECK-NOT: call
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; CHECK: call void @_Z1gi(
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; CHECK-NOT: call
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; CHECK: call void @_Z1fILb1ELi0EEvPbS0_(
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; CHECK-NOT: call
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; CHECK: call void @_Z1fILb0ELi0EEvPbS0_(
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; CHECK-NOT: call
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define void @_Z1fILb1ELi3EEvPbS0_(i8* %B, i8* %E) {
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entry:
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call void @_Z1gi(i32 3)
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%cmp = icmp eq i8* %B, %E
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br i1 %cmp, label %if.end3, label %if.end
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if.end:
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%0 = load i8, i8* %B, align 1
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%tobool = icmp eq i8 %0, 0
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%add.ptr2 = getelementptr inbounds i8, i8* %B, i64 1
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br i1 %tobool, label %if.else, label %if.then1
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if.then1:
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call void @_Z1fILb1ELi4EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.else:
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call void @_Z1fILb0ELi4EEvPbS0_(i8* %add.ptr2, i8* %E)
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br label %if.end3
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if.end3:
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb0ELi4EEvPbS0_(
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; CHECK-NOT: call
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; CHECK: call void @_Z1fILb0ELi0EEvPbS0_(
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; CHECK-NOT: call
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define void @_Z1fILb0ELi4EEvPbS0_(i8* %B, i8* %E) {
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entry:
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call void @_Z1fILb0ELi0EEvPbS0_(i8* %B, i8* %E)
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ret void
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}
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; CHECK-LABEL: define void @_Z1fILb1ELi4EEvPbS0_(
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; OLD-NOT: call
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; OLD: call void @_Z1fILb1ELi0EEvPbS0_(
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; OLD-NOT: call
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; NEW-NOT: call
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; NEW: call void @_Z1gi(
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; NEW-NOT: call
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; NEW: call void @_Z1fILb1ELi1EEvPbS0_(
|
|
; NEW-NOT: call
|
|
; NEW: call void @_Z1fILb0ELi1EEvPbS0_(
|
|
; NEW-NOT: call
|
|
define void @_Z1fILb1ELi4EEvPbS0_(i8* %B, i8* %E) {
|
|
entry:
|
|
call void @_Z1fILb1ELi0EEvPbS0_(i8* %B, i8* %E)
|
|
ret void
|
|
}
|
|
|
|
; CHECK-LABEL: define void @_Z4testPbS_(
|
|
; CHECK: call
|
|
; CHECK-NOT: call
|
|
define void @_Z4testPbS_(i8* %B, i8* %E) {
|
|
entry:
|
|
call void @_Z1fILb0ELi0EEvPbS0_(i8* %B, i8* %E)
|
|
ret void
|
|
}
|
|
|