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Resurrect r191017 " GVN proceeds in the presence of dead code" plus a fix to PR17307 & 17308.

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The problem of r191017 is that when GVN fabricate a val-number for a dead instruction (in order
to make following expr-PRE happy), it forget to fabricate a leader-table entry for it as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191118 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Shuxin Yang
2013-09-20 23:12:57 +00:00
parent 4a20092e63
commit d93e8a06b2
9 changed files with 388 additions and 28 deletions
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8
test/Transforms/GVN/2007-07-26-InterlockingLoops.ll
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@@ -2,7 +2,7 @@
@last = external global [65 x i32*]
define i32 @NextRootMove(i32 %wtm) {
define i32 @NextRootMove(i32 %wtm, i32 %x, i32 %y, i32 %z) {
entry:
%A = alloca i32*
%tmp17618 = load i32** getelementptr ([65 x i32*]* @last, i32 0, i32 1), align 4
@@ -15,12 +15,14 @@ entry:
br label %cond_true116
cond_true116:
br i1 false, label %cond_true128, label %cond_true145
%cmp = icmp eq i32 %x, %y
br i1 %cmp, label %cond_true128, label %cond_true145
cond_true128:
%tmp17625 = load i32** getelementptr ([65 x i32*]* @last, i32 0, i32 1), align 4
store i32* %tmp17625, i32** %A
br i1 false, label %bb98.backedge, label %return.loopexit
%cmp1 = icmp eq i32 %x, %z
br i1 %cmp1 , label %bb98.backedge, label %return.loopexit
bb98.backedge:
br label %cond_true116

8
test/Transforms/GVN/2008-07-02-Unreachable.ll
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@@ -3,10 +3,11 @@
@g_3 = external global i8 ; <i8*> [#uses=2]
define i8 @func_1() nounwind {
define i8 @func_1(i32 %x, i32 %y) nounwind {
entry:
%A = alloca i8
br i1 false, label %ifelse, label %ifthen
%cmp = icmp eq i32 %x, %y
br i1 %cmp, label %ifelse, label %ifthen
ifthen: ; preds = %entry
br label %ifend
@@ -14,9 +15,6 @@ ifthen: ; preds = %entry
ifelse: ; preds = %entry
%tmp3 = load i8* @g_3 ; <i8> [#uses=0]
store i8 %tmp3, i8* %A
br label %forcond.thread
forcond.thread: ; preds = %ifelse
br label %afterfor
forcond: ; preds = %forinc

55
test/Transforms/GVN/cond_br.ll Normal file
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@@ -0,0 +1,55 @@
; RUN: opt -basicaa -gvn -S < %s | FileCheck %s
@y = external global i32
@z = external global i32
; Function Attrs: nounwind ssp uwtable
define void @foo(i32 %x) {
; CHECK: @foo(i32 %x)
; CHECK: %.pre = load i32* @y
; CHECK: call void @bar(i32 %.pre)
%t = sub i32 %x, %x
%.pre = load i32* @y, align 4
%cmp = icmp sgt i32 %t, 2
br i1 %cmp, label %if.then, label %entry.if.end_crit_edge
entry.if.end_crit_edge: ; preds = %entry
br label %if.end
if.then: ; preds = %entry
%add = add nsw i32 %x, 3
store i32 %add, i32* @y, align 4
br label %if.end
if.end: ; preds = %entry.if.end_crit_edge, %if.then
%1 = phi i32 [ %.pre, %entry.if.end_crit_edge ], [ %add, %if.then ]
tail call void @bar(i32 %1)
ret void
}
define void @foo2(i32 %x) {
; CHECK: @foo2(i32 %x)
; CHECK: %.pre = load i32* @y
; CHECK: tail call void @bar(i32 %.pre)
entry:
%t = sub i32 %x, %x
%.pre = load i32* @y, align 4
%cmp = icmp sgt i32 %t, 2
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
%add = add nsw i32 %x, 3
store i32 %add, i32* @y, align 4
br label %if.end
if.else: ; preds = %entry
store i32 1, i32* @z, align 4
br label %if.end
if.end: ; preds = %if.else, %if.then
%0 = phi i32 [ %.pre, %if.else ], [ %add, %if.then ]
tail call void @bar(i32 %0)
ret void
}
declare void @bar(i32)

139
test/Transforms/GVN/cond_br2.ll Normal file
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@@ -0,0 +1,139 @@
; RUN: opt -basicaa -gvn -S < %s | FileCheck %s
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-S128"
%"class.llvm::SmallVector" = type { %"class.llvm::SmallVectorImpl", [1 x %"union.llvm::SmallVectorBase::U"] }
%"class.llvm::SmallVectorImpl" = type { %"class.llvm::SmallVectorTemplateBase" }
%"class.llvm::SmallVectorTemplateBase" = type { %"class.llvm::SmallVectorTemplateCommon" }
%"class.llvm::SmallVectorTemplateCommon" = type { %"class.llvm::SmallVectorBase" }
%"class.llvm::SmallVectorBase" = type { i8*, i8*, i8*, %"union.llvm::SmallVectorBase::U" }
%"union.llvm::SmallVectorBase::U" = type { x86_fp80 }
; Function Attrs: ssp uwtable
define void @_Z4testv() #0 {
; CHECK: @_Z4testv()
; CHECK: invoke.cont:
; CHECK: br i1 true, label %new.notnull.i11, label %if.end.i14
; CHECK: Retry.i10:
entry:
%sv = alloca %"class.llvm::SmallVector", align 16
%0 = bitcast %"class.llvm::SmallVector"* %sv to i8*
call void @llvm.lifetime.start(i64 64, i8* %0) #1
%BeginX.i.i.i.i.i.i = getelementptr inbounds %"class.llvm::SmallVector"* %sv, i64 0, i32 0, i32 0, i32 0, i32 0, i32 0
%FirstEl.i.i.i.i.i.i = getelementptr inbounds %"class.llvm::SmallVector"* %sv, i64 0, i32 0, i32 0, i32 0, i32 0, i32 3
%1 = bitcast %"union.llvm::SmallVectorBase::U"* %FirstEl.i.i.i.i.i.i to i8*
store i8* %1, i8** %BeginX.i.i.i.i.i.i, align 16, !tbaa !0
%EndX.i.i.i.i.i.i = getelementptr inbounds %"class.llvm::SmallVector"* %sv, i64 0, i32 0, i32 0, i32 0, i32 0, i32 1
store i8* %1, i8** %EndX.i.i.i.i.i.i, align 8, !tbaa !0
%CapacityX.i.i.i.i.i.i = getelementptr inbounds %"class.llvm::SmallVector"* %sv, i64 0, i32 0, i32 0, i32 0, i32 0, i32 2
%add.ptr.i.i.i.i2.i.i = getelementptr inbounds %"union.llvm::SmallVectorBase::U"* %FirstEl.i.i.i.i.i.i, i64 2
%add.ptr.i.i.i.i.i.i = bitcast %"union.llvm::SmallVectorBase::U"* %add.ptr.i.i.i.i2.i.i to i8*
store i8* %add.ptr.i.i.i.i.i.i, i8** %CapacityX.i.i.i.i.i.i, align 16, !tbaa !0
%EndX.i = getelementptr inbounds %"class.llvm::SmallVector"* %sv, i64 0, i32 0, i32 0, i32 0, i32 0, i32 1
%2 = load i8** %EndX.i, align 8, !tbaa !0
%CapacityX.i = getelementptr inbounds %"class.llvm::SmallVector"* %sv, i64 0, i32 0, i32 0, i32 0, i32 0, i32 2
%cmp.i = icmp ult i8* %2, %add.ptr.i.i.i.i.i.i
br i1 %cmp.i, label %Retry.i, label %if.end.i
Retry.i: ; preds = %.noexc, %entry
%3 = phi i8* [ %2, %entry ], [ %.pre.i, %.noexc ]
%new.isnull.i = icmp eq i8* %3, null
br i1 %new.isnull.i, label %invoke.cont, label %new.notnull.i
new.notnull.i: ; preds = %Retry.i
%4 = bitcast i8* %3 to i32*
store i32 1, i32* %4, align 4, !tbaa !3
br label %invoke.cont
if.end.i: ; preds = %entry
%5 = getelementptr inbounds %"class.llvm::SmallVector"* %sv, i64 0, i32 0, i32 0, i32 0, i32 0
invoke void @_ZN4llvm15SmallVectorBase8grow_podEmm(%"class.llvm::SmallVectorBase"* %5, i64 0, i64 4)
to label %.noexc unwind label %lpad
.noexc: ; preds = %if.end.i
%.pre.i = load i8** %EndX.i, align 8, !tbaa !0
br label %Retry.i
invoke.cont: ; preds = %new.notnull.i, %Retry.i
%add.ptr.i = getelementptr inbounds i8* %3, i64 4
store i8* %add.ptr.i, i8** %EndX.i, align 8, !tbaa !0
%6 = load i8** %CapacityX.i, align 16, !tbaa !0
%cmp.i8 = icmp ult i8* %add.ptr.i, %6
br i1 %cmp.i8, label %new.notnull.i11, label %if.end.i14
Retry.i10: ; preds = %if.end.i14
%.pre.i13 = load i8** %EndX.i, align 8, !tbaa !0
%new.isnull.i9 = icmp eq i8* %.pre.i13, null
br i1 %new.isnull.i9, label %invoke.cont2, label %new.notnull.i11
new.notnull.i11: ; preds = %invoke.cont, %Retry.i10
%7 = phi i8* [ %.pre.i13, %Retry.i10 ], [ %add.ptr.i, %invoke.cont ]
%8 = bitcast i8* %7 to i32*
store i32 2, i32* %8, align 4, !tbaa !3
br label %invoke.cont2
if.end.i14: ; preds = %invoke.cont
%9 = getelementptr inbounds %"class.llvm::SmallVector"* %sv, i64 0, i32 0, i32 0, i32 0, i32 0
invoke void @_ZN4llvm15SmallVectorBase8grow_podEmm(%"class.llvm::SmallVectorBase"* %9, i64 0, i64 4)
to label %Retry.i10 unwind label %lpad
invoke.cont2: ; preds = %new.notnull.i11, %Retry.i10
%10 = phi i8* [ null, %Retry.i10 ], [ %7, %new.notnull.i11 ]
%add.ptr.i12 = getelementptr inbounds i8* %10, i64 4
store i8* %add.ptr.i12, i8** %EndX.i, align 8, !tbaa !0
invoke void @_Z1gRN4llvm11SmallVectorIiLj8EEE(%"class.llvm::SmallVector"* %sv)
to label %invoke.cont3 unwind label %lpad
invoke.cont3: ; preds = %invoke.cont2
%11 = load i8** %BeginX.i.i.i.i.i.i, align 16, !tbaa !0
%cmp.i.i.i.i19 = icmp eq i8* %11, %1
br i1 %cmp.i.i.i.i19, label %_ZN4llvm11SmallVectorIiLj8EED1Ev.exit21, label %if.then.i.i.i20
if.then.i.i.i20: ; preds = %invoke.cont3
call void @free(i8* %11) #1
br label %_ZN4llvm11SmallVectorIiLj8EED1Ev.exit21
_ZN4llvm11SmallVectorIiLj8EED1Ev.exit21: ; preds = %invoke.cont3, %if.then.i.i.i20
call void @llvm.lifetime.end(i64 64, i8* %0) #1
ret void
lpad: ; preds = %if.end.i14, %if.end.i, %invoke.cont2
%12 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
cleanup
%13 = load i8** %BeginX.i.i.i.i.i.i, align 16, !tbaa !0
%cmp.i.i.i.i = icmp eq i8* %13, %1
br i1 %cmp.i.i.i.i, label %eh.resume, label %if.then.i.i.i
if.then.i.i.i: ; preds = %lpad
call void @free(i8* %13) #1
br label %eh.resume
eh.resume: ; preds = %if.then.i.i.i, %lpad
resume { i8*, i32 } %12
}
; Function Attrs: nounwind
declare void @llvm.lifetime.start(i64, i8* nocapture) #1
declare i32 @__gxx_personality_v0(...)
declare void @_Z1gRN4llvm11SmallVectorIiLj8EEE(%"class.llvm::SmallVector"*) #2
; Function Attrs: nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture) #1
declare void @_ZN4llvm15SmallVectorBase8grow_podEmm(%"class.llvm::SmallVectorBase"*, i64, i64) #2
; Function Attrs: nounwind
declare void @free(i8* nocapture) #3
attributes #0 = { ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind }
attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
!0 = metadata !{metadata !"any pointer", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA"}
!3 = metadata !{metadata !"int", metadata !1}

6
test/Transforms/GVN/local-pre.ll
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@@ -1,9 +1,9 @@
; RUN: opt < %s -gvn -enable-pre -S | grep "b.pre"
define i32 @main(i32 %p) {
define i32 @main(i32 %p, i32 %q) {
block1:
br i1 true, label %block2, label %block3
%cmp = icmp eq i32 %p, %q
br i1 %cmp, label %block2, label %block3
block2:
%a = add i32 %p, 1

5
test/Transforms/GVN/rle-nonlocal.ll
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@@ -1,8 +1,9 @@
; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
define i32 @main(i32** %p) {
define i32 @main(i32** %p, i32 %x, i32 %y) {
block1:
br i1 true, label %block2, label %block3
%cmp = icmp eq i32 %x, %y
br i1 %cmp , label %block2, label %block3
block2:
%a = load i32** %p

5
test/Transforms/GVN/rle-semidominated.ll
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@@ -1,9 +1,10 @@
; RUN: opt < %s -basicaa -gvn -S | grep "DEAD = phi i32 "
define i32 @main(i32* %p) {
define i32 @main(i32* %p, i32 %x, i32 %y) {
block1:
%z = load i32* %p
br i1 true, label %block2, label %block3
%cmp = icmp eq i32 %x, %y
br i1 %cmp, label %block2, label %block3
block2:
br label %block4

16
test/Transforms/GVN/rle.ll
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@@ -357,13 +357,14 @@ Cont:
; CHECK: ret i8 %A
}
define i32 @chained_load(i32** %p) {
define i32 @chained_load(i32** %p, i32 %x, i32 %y) {
block1:
%A = alloca i32*
%z = load i32** %p
store i32* %z, i32** %A
br i1 true, label %block2, label %block3
%cmp = icmp eq i32 %x, %y
br i1 %cmp, label %block2, label %block3
block2:
%a = load i32** %p
@@ -427,10 +428,11 @@ TY:
ret i32 0
}
define i32 @phi_trans3(i32* %p) {
define i32 @phi_trans3(i32* %p, i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @phi_trans3(
block1:
br i1 true, label %block2, label %block3
%cmpxy = icmp eq i32 %x, %y
br i1 %cmpxy, label %block2, label %block3
block2:
store i32 87, i32* %p
@@ -443,7 +445,7 @@ block3:
block4:
%A = phi i32 [-1, %block2], [42, %block3]
br i1 true, label %block5, label %exit
br i1 %cmpxy, label %block5, label %exit
; CHECK: block4:
; CHECK-NEXT: %D = phi i32 [ 87, %block2 ], [ 97, %block3 ]
@@ -451,11 +453,11 @@ block4:
block5:
%B = add i32 %A, 1
br i1 true, label %block6, label %exit
br i1 %cmpxy, label %block6, label %exit
block6:
%C = getelementptr i32* %p, i32 %B
br i1 true, label %block7, label %exit
br i1 %cmpxy, label %block7, label %exit
block7:
%D = load i32* %C