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https://github.com/c64scene-ar/llvm-6502.git
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6da12e6767
that can have a big effect :). The first is to enable the
iterative SCC passmanager juice that kicks in when the
scc passmgr detects that a function pass has devirtualized
a call. In this case, it will rerun all the passes it
manages on the SCC, up to the iteration count limit (4). This
is useful because a function pass may devirualize a call, and
we want the inliner to inline it, or pruneeh to infer stuff
about it, etc.
The second patch is to add *all* call sites to the
DevirtualizedCalls list the inliner uses. This list is
about to get renamed, but the jist of this is that the
inliner now reconsiders *all* inlined call sites as candidates
for further inlining. The intuition is this that in cases
like this:
f() { g(1); } g(int x) { h(x); }
We analyze this bottom up, and may decide that it isn't
profitable to inline H into G. Next step, we decide that it is
profitable to inline G into F, and do so, which means that F
now calls H. Even though the call from G -> H may not have been
profitable to inline, the call from F -> H may be (in this case
because a constant allows folding etc).
In my spot checks, this doesn't have a big impact on code. For
example, the LLC output for 252.eon grew from 0.02% (from
317252 to 317308) and 176.gcc actually shrunk by .3% (from 1525612
to 1520964 bytes). 252.eon never iterated in the SCC Passmgr,
176.gcc iterated at most 1 time.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102823 91177308-0d34-0410-b5e6-96231b3b80d8
183 lines
8.6 KiB
LLVM
183 lines
8.6 KiB
LLVM
; RUN: opt -S -inline -scalarrepl -instcombine -simplifycfg -instcombine -gvn -globaldce %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10.0.0"
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; Simple devirt testcase, requires iteration between inliner and GVN.
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; rdar://6295824
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define i32 @foo(i32 ()** noalias %p, i64* noalias %q) nounwind ssp {
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entry:
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store i32 ()* @bar, i32 ()** %p
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store i64 0, i64* %q
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%tmp3 = load i32 ()** %p ; <i32 ()*> [#uses=1]
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%call = call i32 %tmp3() ; <i32> [#uses=1]
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%X = add i32 %call, 4
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ret i32 %X
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; CHECK: @foo
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store
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; CHECK-NEXT: store
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; CHECK-NEXT: ret i32 11
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}
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define internal i32 @bar() nounwind ssp {
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entry:
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ret i32 7
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}
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;; More complex devirt case, from PR6724
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; CHECK: @_Z1gv()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i32 7
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%0 = type { i8*, i8* }
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%1 = type { i8*, i8*, i32, i32, i8*, i64, i8*, i64 }
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%2 = type { i8*, i8*, i8* }
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%struct.A = type { i8** }
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%struct.B = type { i8** }
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%struct.C = type { [16 x i8] }
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%struct.D = type { [16 x i8] }
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@_ZTV1D = linkonce_odr constant [6 x i8*] [i8* null, i8* bitcast (%2* @_ZTI1D to i8*), i8* bitcast (i32 (%struct.C*)* @_ZN1D1fEv to i8*), i8* inttoptr (i64 -8 to i8*), i8* bitcast (%2* @_ZTI1D to i8*), i8* bitcast (i32 (%struct.C*)* @_ZThn8_N1D1fEv to i8*)] ; <[6 x i8*]*> [#uses=2]
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@_ZTVN10__cxxabiv120__si_class_type_infoE = external global i8* ; <i8**> [#uses=1]
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@_ZTS1D = linkonce_odr constant [3 x i8] c"1D\00" ; <[3 x i8]*> [#uses=1]
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@_ZTVN10__cxxabiv121__vmi_class_type_infoE = external global i8* ; <i8**> [#uses=1]
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@_ZTS1C = linkonce_odr constant [3 x i8] c"1C\00" ; <[3 x i8]*> [#uses=1]
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@_ZTVN10__cxxabiv117__class_type_infoE = external global i8* ; <i8**> [#uses=1]
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@_ZTS1A = linkonce_odr constant [3 x i8] c"1A\00" ; <[3 x i8]*> [#uses=1]
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@_ZTI1A = linkonce_odr constant %0 { i8* bitcast (i8** getelementptr inbounds (i8** @_ZTVN10__cxxabiv117__class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([3 x i8]* @_ZTS1A, i32 0, i32 0) } ; <%0*> [#uses=1]
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@_ZTS1B = linkonce_odr constant [3 x i8] c"1B\00" ; <[3 x i8]*> [#uses=1]
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@_ZTI1B = linkonce_odr constant %0 { i8* bitcast (i8** getelementptr inbounds (i8** @_ZTVN10__cxxabiv117__class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([3 x i8]* @_ZTS1B, i32 0, i32 0) } ; <%0*> [#uses=1]
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@_ZTI1C = linkonce_odr constant %1 { i8* bitcast (i8** getelementptr inbounds (i8** @_ZTVN10__cxxabiv121__vmi_class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([3 x i8]* @_ZTS1C, i32 0, i32 0), i32 0, i32 2, i8* bitcast (%0* @_ZTI1A to i8*), i64 2, i8* bitcast (%0* @_ZTI1B to i8*), i64 2050 } ; <%1*> [#uses=1]
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@_ZTI1D = linkonce_odr constant %2 { i8* bitcast (i8** getelementptr inbounds (i8** @_ZTVN10__cxxabiv120__si_class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([3 x i8]* @_ZTS1D, i32 0, i32 0), i8* bitcast (%1* @_ZTI1C to i8*) } ; <%2*> [#uses=1]
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@_ZTV1C = linkonce_odr constant [6 x i8*] [i8* null, i8* bitcast (%1* @_ZTI1C to i8*), i8* bitcast (i32 (%struct.C*)* @_ZN1C1fEv to i8*), i8* inttoptr (i64 -8 to i8*), i8* bitcast (%1* @_ZTI1C to i8*), i8* bitcast (i32 (%struct.C*)* @_ZThn8_N1C1fEv to i8*)] ; <[6 x i8*]*> [#uses=2]
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@_ZTV1B = linkonce_odr constant [3 x i8*] [i8* null, i8* bitcast (%0* @_ZTI1B to i8*), i8* bitcast (i32 (%struct.A*)* @_ZN1B1fEv to i8*)] ; <[3 x i8*]*> [#uses=1]
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@_ZTV1A = linkonce_odr constant [3 x i8*] [i8* null, i8* bitcast (%0* @_ZTI1A to i8*), i8* bitcast (i32 (%struct.A*)* @_ZN1A1fEv to i8*)] ; <[3 x i8*]*> [#uses=1]
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define i32 @_Z1gv() ssp {
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entry:
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%d = alloca %struct.C, align 8 ; <%struct.C*> [#uses=2]
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call void @_ZN1DC1Ev(%struct.C* %d)
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%call = call i32 @_Z1fP1D(%struct.C* %d) ; <i32> [#uses=1]
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%X = add i32 %call, 3
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ret i32 %X
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}
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define linkonce_odr void @_ZN1DC1Ev(%struct.C* %this) inlinehint ssp align 2 {
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entry:
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call void @_ZN1DC2Ev(%struct.C* %this)
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ret void
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}
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define internal i32 @_Z1fP1D(%struct.C* %d) ssp {
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entry:
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%0 = icmp eq %struct.C* %d, null ; <i1> [#uses=1]
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br i1 %0, label %cast.end, label %cast.notnull
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cast.notnull: ; preds = %entry
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%1 = bitcast %struct.C* %d to i8* ; <i8*> [#uses=1]
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%add.ptr = getelementptr i8* %1, i64 8 ; <i8*> [#uses=1]
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%2 = bitcast i8* %add.ptr to %struct.A* ; <%struct.A*> [#uses=1]
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br label %cast.end
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cast.end: ; preds = %entry, %cast.notnull
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%3 = phi %struct.A* [ %2, %cast.notnull ], [ null, %entry ] ; <%struct.A*> [#uses=2]
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%4 = bitcast %struct.A* %3 to i32 (%struct.A*)*** ; <i32 (%struct.A*)***> [#uses=1]
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%5 = load i32 (%struct.A*)*** %4 ; <i32 (%struct.A*)**> [#uses=1]
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%vfn = getelementptr inbounds i32 (%struct.A*)** %5, i64 0 ; <i32 (%struct.A*)**> [#uses=1]
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%6 = load i32 (%struct.A*)** %vfn ; <i32 (%struct.A*)*> [#uses=1]
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%call = call i32 %6(%struct.A* %3) ; <i32> [#uses=1]
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ret i32 %call
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}
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define linkonce_odr i32 @_ZN1D1fEv(%struct.C* %this) ssp align 2 {
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entry:
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ret i32 4
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}
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define linkonce_odr i32 @_ZThn8_N1D1fEv(%struct.C* %this) {
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entry:
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%0 = bitcast %struct.C* %this to i8* ; <i8*> [#uses=1]
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%1 = getelementptr inbounds i8* %0, i64 -8 ; <i8*> [#uses=1]
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%2 = bitcast i8* %1 to %struct.C* ; <%struct.C*> [#uses=1]
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%call = call i32 @_ZN1D1fEv(%struct.C* %2) ; <i32> [#uses=1]
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ret i32 %call
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}
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define linkonce_odr void @_ZN1DC2Ev(%struct.C* %this) inlinehint ssp align 2 {
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entry:
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call void @_ZN1CC2Ev(%struct.C* %this)
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%0 = bitcast %struct.C* %this to i8* ; <i8*> [#uses=1]
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%1 = getelementptr inbounds i8* %0, i64 0 ; <i8*> [#uses=1]
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%2 = bitcast i8* %1 to i8*** ; <i8***> [#uses=1]
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store i8** getelementptr inbounds ([6 x i8*]* @_ZTV1D, i64 0, i64 2), i8*** %2
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%3 = bitcast %struct.C* %this to i8* ; <i8*> [#uses=1]
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%4 = getelementptr inbounds i8* %3, i64 8 ; <i8*> [#uses=1]
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%5 = bitcast i8* %4 to i8*** ; <i8***> [#uses=1]
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store i8** getelementptr inbounds ([6 x i8*]* @_ZTV1D, i64 0, i64 5), i8*** %5
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ret void
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}
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define linkonce_odr void @_ZN1CC2Ev(%struct.C* %this) inlinehint ssp align 2 {
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entry:
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%0 = bitcast %struct.C* %this to %struct.A* ; <%struct.A*> [#uses=1]
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call void @_ZN1AC2Ev(%struct.A* %0)
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%1 = bitcast %struct.C* %this to i8* ; <i8*> [#uses=1]
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%2 = getelementptr inbounds i8* %1, i64 8 ; <i8*> [#uses=1]
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%3 = bitcast i8* %2 to %struct.A* ; <%struct.A*> [#uses=1]
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call void @_ZN1BC2Ev(%struct.A* %3)
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%4 = bitcast %struct.C* %this to i8* ; <i8*> [#uses=1]
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%5 = getelementptr inbounds i8* %4, i64 0 ; <i8*> [#uses=1]
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%6 = bitcast i8* %5 to i8*** ; <i8***> [#uses=1]
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store i8** getelementptr inbounds ([6 x i8*]* @_ZTV1C, i64 0, i64 2), i8*** %6
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%7 = bitcast %struct.C* %this to i8* ; <i8*> [#uses=1]
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%8 = getelementptr inbounds i8* %7, i64 8 ; <i8*> [#uses=1]
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%9 = bitcast i8* %8 to i8*** ; <i8***> [#uses=1]
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store i8** getelementptr inbounds ([6 x i8*]* @_ZTV1C, i64 0, i64 5), i8*** %9
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ret void
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}
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define linkonce_odr i32 @_ZN1C1fEv(%struct.C* %this) ssp align 2 {
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entry:
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ret i32 3
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}
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define linkonce_odr i32 @_ZThn8_N1C1fEv(%struct.C* %this) {
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entry:
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%0 = bitcast %struct.C* %this to i8* ; <i8*> [#uses=1]
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%1 = getelementptr inbounds i8* %0, i64 -8 ; <i8*> [#uses=1]
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%2 = bitcast i8* %1 to %struct.C* ; <%struct.C*> [#uses=1]
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%call = call i32 @_ZN1C1fEv(%struct.C* %2) ; <i32> [#uses=1]
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ret i32 %call
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}
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define linkonce_odr void @_ZN1AC2Ev(%struct.A* %this) inlinehint ssp align 2 {
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entry:
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%0 = bitcast %struct.A* %this to i8* ; <i8*> [#uses=1]
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%1 = getelementptr inbounds i8* %0, i64 0 ; <i8*> [#uses=1]
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%2 = bitcast i8* %1 to i8*** ; <i8***> [#uses=1]
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store i8** getelementptr inbounds ([3 x i8*]* @_ZTV1A, i64 0, i64 2), i8*** %2
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ret void
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}
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define linkonce_odr void @_ZN1BC2Ev(%struct.A* %this) inlinehint ssp align 2 {
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entry:
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%0 = bitcast %struct.A* %this to i8* ; <i8*> [#uses=1]
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%1 = getelementptr inbounds i8* %0, i64 0 ; <i8*> [#uses=1]
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%2 = bitcast i8* %1 to i8*** ; <i8***> [#uses=1]
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store i8** getelementptr inbounds ([3 x i8*]* @_ZTV1B, i64 0, i64 2), i8*** %2
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ret void
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}
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define linkonce_odr i32 @_ZN1B1fEv(%struct.A* %this) ssp align 2 {
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entry:
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ret i32 2
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}
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define linkonce_odr i32 @_ZN1A1fEv(%struct.A* %this) ssp align 2 {
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entry:
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ret i32 1
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}
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