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Dereferenceable, dereferenceable_or_null metadata for loads

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Summary:
Introduce dereferenceable, dereferenceable_or_null metadata for loads
with the same semantic as corresponding attributes.

This patch depends on http://reviews.llvm.org/D9253

Patch by Artur Pilipenko!

Reviewers: hfinkel, sanjoy, reames

Reviewed By: sanjoy, reames

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9365

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237720 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjoy Das
2015-05-19 20:10:19 +00:00
parent 041ab65fcd
commit 4d88c3ebad
6 changed files with 215 additions and 5 deletions
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test/Analysis/ValueTracking/memory-dereferenceable.ll
+32 -1
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@@ -8,6 +8,7 @@ target datalayout = "e"
declare zeroext i1 @return_i1()
@globalstr = global [6 x i8] c"hello\00"
@globali32ptr = external global i32*
define void @test(i32 addrspace(1)* dereferenceable(8) %dparam) gc "statepoint-example" {
; CHECK: The following are dereferenceable:
@@ -15,7 +16,12 @@ define void @test(i32 addrspace(1)* dereferenceable(8) %dparam) gc "statepoint-e
; CHECK: %alloca
; CHECK: %dparam
; CHECK: %relocate
; CHECK: %d4_load
; CHECK: %d_or_null_non_null_load
; CHECK-NOT: %nparam
; CHECK-NOT: %nd_load
; CHECK-NOT: %d2_load
; CHECK-NOT: %d_or_null_load
entry:
%globalptr = getelementptr inbounds [6 x i8], [6 x i8]* @globalstr, i32 0, i32 0
%load1 = load i8, i8* %globalptr
@@ -27,8 +33,33 @@ entry:
%load4 = load i32, i32 addrspace(1)* %relocate
%nparam = getelementptr i32, i32 addrspace(1)* %dparam, i32 5
%load5 = load i32, i32 addrspace(1)* %nparam
; Load from a non-dereferenceable load
%nd_load = load i32*, i32** @globali32ptr, !dereferenceable !0
%load6 = load i32, i32* %nd_load
; Load from a dereferenceable load
%d4_load = load i32*, i32** @globali32ptr, !dereferenceable !0
%load7 = load i32, i32* %d4_load
; Load from an offset not covered by the dereferenceable portion
%d2_load = load i32*, i32** @globali32ptr, !dereferenceable !1
%load8 = load i32, i32* %d2_load
; Load from a potentially null pointer with dereferenceable_or_null
%d_or_null_load = load i32*, i32** @globali32ptr, !dereferenceable_or_null !0
%load9 = load i32, i32* %d_or_null_load
; Load from a non-null pointer with dereferenceable_or_null
%d_or_null_non_null_load = load i32*, i32** @globali32ptr, !nonnull !2, !dereferenceable_or_null !0
%load10 = load i32, i32* %d_or_null_non_null_load
ret void
}
declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i64, i32, i1 ()*, i32, i32, ...)
declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)
declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)
!0 = !{i64 4}
!1 = !{i64 2}
!2 = !{}