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llvm-mirror/test/Transforms/GVN/assume-equal.ll
David L Kreitzer 28ea778709 Fix for two constant propagation problems in GVN with the assume intrinsic 
instruction.

Patch by Yuanrui Zhang.

Differential Revision: http://reviews.llvm.org/D16100

llvm-svn: 258435
2016-01-21 21:32:35 +00:00

276 lines
8.4 KiB
LLVM
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; RUN: opt < %s -gvn -S | FileCheck %s
%struct.A = type { i32 (...)** }
@_ZTV1A = available_externally unnamed_addr constant [4 x i8*] [i8* null, i8* bitcast (i8** @_ZTI1A to i8*), i8* bitcast (i32 (%struct.A*)* @_ZN1A3fooEv to i8*), i8* bitcast (i32 (%struct.A*)* @_ZN1A3barEv to i8*)], align 8
@_ZTI1A = external constant i8*
; Checks if indirect calls can be replaced with direct
; assuming that %vtable == @_ZTV1A (with alignment).
; Checking const propagation across other BBs
; CHECK-LABEL: define void @_Z1gb(
define void @_Z1gb(i1 zeroext %p) {
entry:
%call = tail call noalias i8* @_Znwm(i64 8) #4
%0 = bitcast i8* %call to %struct.A*
tail call void @_ZN1AC1Ev(%struct.A* %0) #1
%1 = bitcast i8* %call to i8***
%vtable = load i8**, i8*** %1, align 8
%cmp.vtables = icmp eq i8** %vtable, getelementptr inbounds ([4 x i8*], [4 x i8*]* @_ZTV1A, i64 0, i64 2)
tail call void @llvm.assume(i1 %cmp.vtables)
br i1 %p, label %if.then, label %if.else
if.then: ; preds = %entry
%vtable1.cast = bitcast i8** %vtable to i32 (%struct.A*)**
%2 = load i32 (%struct.A*)*, i32 (%struct.A*)** %vtable1.cast, align 8
; CHECK: call i32 @_ZN1A3fooEv(
%call2 = tail call i32 %2(%struct.A* %0) #1
br label %if.end
if.else: ; preds = %entry
%vfn47 = getelementptr inbounds i8*, i8** %vtable, i64 1
%vfn4 = bitcast i8** %vfn47 to i32 (%struct.A*)**
; CHECK: call i32 @_ZN1A3barEv(
%3 = load i32 (%struct.A*)*, i32 (%struct.A*)** %vfn4, align 8
%call5 = tail call i32 %3(%struct.A* %0) #1
br label %if.end
if.end: ; preds = %if.else, %if.then
ret void
}
; Check integration with invariant.group handling
; CHECK-LABEL: define void @invariantGroupHandling(i1 zeroext %p) {
define void @invariantGroupHandling(i1 zeroext %p) {
entry:
%call = tail call noalias i8* @_Znwm(i64 8) #4
%0 = bitcast i8* %call to %struct.A*
tail call void @_ZN1AC1Ev(%struct.A* %0) #1
%1 = bitcast i8* %call to i8***
%vtable = load i8**, i8*** %1, align 8, !invariant.group !0
%cmp.vtables = icmp eq i8** %vtable, getelementptr inbounds ([4 x i8*], [4 x i8*]* @_ZTV1A, i64 0, i64 2)
tail call void @llvm.assume(i1 %cmp.vtables)
br i1 %p, label %if.then, label %if.else
if.then: ; preds = %entry
%vtable1.cast = bitcast i8** %vtable to i32 (%struct.A*)**
%2 = load i32 (%struct.A*)*, i32 (%struct.A*)** %vtable1.cast, align 8
; CHECK: call i32 @_ZN1A3fooEv(
%call2 = tail call i32 %2(%struct.A* %0) #1
%vtable1 = load i8**, i8*** %1, align 8, !invariant.group !0
%vtable2.cast = bitcast i8** %vtable1 to i32 (%struct.A*)**
%call1 = load i32 (%struct.A*)*, i32 (%struct.A*)** %vtable2.cast, align 8
; FIXME: those loads could be also direct, but right now the invariant.group
; analysis works only on single block
; CHECK-NOT: call i32 @_ZN1A3fooEv(
%callx = tail call i32 %call1(%struct.A* %0) #1
%vtable2 = load i8**, i8*** %1, align 8, !invariant.group !0
%vtable3.cast = bitcast i8** %vtable2 to i32 (%struct.A*)**
%call4 = load i32 (%struct.A*)*, i32 (%struct.A*)** %vtable3.cast, align 8
; CHECK-NOT: call i32 @_ZN1A3fooEv(
%cally = tail call i32 %call4(%struct.A* %0) #1
%b = bitcast i8* %call to %struct.A**
%vtable3 = load %struct.A*, %struct.A** %b, align 8, !invariant.group !0
%vtable4.cast = bitcast %struct.A* %vtable3 to i32 (%struct.A*)**
%vfun = load i32 (%struct.A*)*, i32 (%struct.A*)** %vtable4.cast, align 8
; CHECK-NOT: call i32 @_ZN1A3fooEv(
%unknown = tail call i32 %vfun(%struct.A* %0) #1
br label %if.end
if.else: ; preds = %entry
%vfn47 = getelementptr inbounds i8*, i8** %vtable, i64 1
%vfn4 = bitcast i8** %vfn47 to i32 (%struct.A*)**
; CHECK: call i32 @_ZN1A3barEv(
%3 = load i32 (%struct.A*)*, i32 (%struct.A*)** %vfn4, align 8
%call5 = tail call i32 %3(%struct.A* %0) #1
br label %if.end
if.end: ; preds = %if.else, %if.then
ret void
}
; Checking const propagation in the same BB
; CHECK-LABEL: define i32 @main()
define i32 @main() {
entry:
%call = tail call noalias i8* @_Znwm(i64 8)
%0 = bitcast i8* %call to %struct.A*
tail call void @_ZN1AC1Ev(%struct.A* %0)
%1 = bitcast i8* %call to i8***
%vtable = load i8**, i8*** %1, align 8
%cmp.vtables = icmp eq i8** %vtable, getelementptr inbounds ([4 x i8*], [4 x i8*]* @_ZTV1A, i64 0, i64 2)
tail call void @llvm.assume(i1 %cmp.vtables)
%vtable1.cast = bitcast i8** %vtable to i32 (%struct.A*)**
; CHECK: call i32 @_ZN1A3fooEv(
%2 = load i32 (%struct.A*)*, i32 (%struct.A*)** %vtable1.cast, align 8
%call2 = tail call i32 %2(%struct.A* %0)
ret i32 0
}
; This tests checks const propatation with fcmp instruction.
; CHECK-LABEL: define float @_Z1gf(float %p)
define float @_Z1gf(float %p) {
entry:
%p.addr = alloca float, align 4
%f = alloca float, align 4
store float %p, float* %p.addr, align 4
store float 3.000000e+00, float* %f, align 4
%0 = load float, float* %p.addr, align 4
%1 = load float, float* %f, align 4
%cmp = fcmp oeq float %1, %0 ; note const on lhs
call void @llvm.assume(i1 %cmp)
; CHECK: ret float 3.000000e+00
ret float %0
}
; CHECK-LABEL: define float @_Z1hf(float %p)
define float @_Z1hf(float %p) {
entry:
%p.addr = alloca float, align 4
store float %p, float* %p.addr, align 4
%0 = load float, float* %p.addr, align 4
%cmp = fcmp nnan ueq float %0, 3.000000e+00
call void @llvm.assume(i1 %cmp)
; CHECK: ret float 3.000000e+00
ret float %0
}
; CHECK-LABEL: define float @_Z1if(float %p)
define float @_Z1if(float %p) {
entry:
%p.addr = alloca float, align 4
store float %p, float* %p.addr, align 4
%0 = load float, float* %p.addr, align 4
%cmp = fcmp ueq float %0, 3.000000e+00 ; no nnan flag - can't propagate
call void @llvm.assume(i1 %cmp)
; CHECK-NOT: ret float 3.000000e+00
ret float %0
}
; This test checks if constant propagation works for multiple node edges
; CHECK-LABEL: define i32 @_Z1ii(i32 %p)
define i32 @_Z1ii(i32 %p) {
entry:
%cmp = icmp eq i32 %p, 42
call void @llvm.assume(i1 %cmp)
; CHECK: br i1 true, label %bb2, label %bb2
br i1 %cmp, label %bb2, label %bb2
bb2:
call void @llvm.assume(i1 true)
; CHECK: br i1 true, label %bb2, label %bb2
br i1 %cmp, label %bb2, label %bb2
; CHECK: ret i32 42
ret i32 %p
}
; CHECK-LABEL: define i32 @_Z1ij(i32 %p)
define i32 @_Z1ij(i32 %p) {
entry:
%cmp = icmp eq i32 %p, 42
call void @llvm.assume(i1 %cmp)
; CHECK: br i1 true, label %bb2, label %bb2
br i1 %cmp, label %bb2, label %bb2
bb2:
; CHECK-NOT: %cmp2 =
%cmp2 = icmp eq i32 %p, 42
; CHECK-NOT: call void @llvm.assume(
call void @llvm.assume(i1 %cmp2)
; CHECK: br i1 true, label %bb2, label %bb2
br i1 %cmp, label %bb2, label %bb2
; CHECK: ret i32 42
ret i32 %p
}
; CHECK-LABEL: define i32 @_Z1ik(i32 %p)
define i32 @_Z1ik(i32 %p) {
entry:
%cmp = icmp eq i32 %p, 42
call void @llvm.assume(i1 %cmp)
; CHECK: br i1 true, label %bb2, label %bb3
br i1 %cmp, label %bb2, label %bb3
bb2:
; CHECK-NOT: %cmp3 =
%cmp3 = icmp eq i32 %p, 43
; CHECK: store i8 undef, i8* null
call void @llvm.assume(i1 %cmp3)
ret i32 15
bb3:
ret i32 17
}
; This test checks if GVN can do the constant propagation correctly
; when there are multiple uses of the same assume value in the
; basic block that has a loop back-edge pointing to itself.
;
; CHECK-LABEL: define i32 @_Z1il(i32 %val, i1 %k)
define i32 @_Z1il(i32 %val, i1 %k) {
br label %next
next:
; CHECK: tail call void @llvm.assume(i1 %k)
; CHECK-NEXT: %cmp = icmp eq i32 %val, 50
tail call void @llvm.assume(i1 %k)
tail call void @llvm.assume(i1 %k)
%cmp = icmp eq i32 %val, 50
br i1 %cmp, label %next, label %meh
meh:
ret i32 0
}
; This test checks if GVN can prevent the constant propagation correctly
; in the successor blocks that are not dominated by the basic block
; with the assume instruction.
;
; CHECK-LABEL: define i1 @_z1im(i32 %val, i1 %k, i1 %j)
define i1 @_z1im(i32 %val, i1 %k, i1 %j) {
br i1 %j, label %next, label %meh
next:
; CHECK: tail call void @llvm.assume(i1 %k)
; CHECK-NEXT: br label %meh
tail call void @llvm.assume(i1 %k)
tail call void @llvm.assume(i1 %k)
br label %meh
meh:
; CHECK: ret i1 %k
ret i1 %k
}
declare noalias i8* @_Znwm(i64)
declare void @_ZN1AC1Ev(%struct.A*)
declare void @llvm.assume(i1)
declare i32 @_ZN1A3fooEv(%struct.A*)
declare i32 @_ZN1A3barEv(%struct.A*)
!0 = !{!"struct A"}
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