mirror of
https://github.com/RPCSX/llvm.git
synced 2025-02-27 08:26:23 +00:00
65696f40e4
The code have been developed by Daniel Berlin over the years, and the new implementation goal is that of addressing shortcomings of the current GVN infrastructure, i.e. long compile time for large testcases, lack of phi predication, no load/store value numbering etc... The current code just implements the "core" GVN algorithm, although other pieces (load coercion, phi handling, predicate system) are already implemented in a branch out of tree. Once the core is stable, we'll start adding pieces on top of the base framework. The test currently living in test/Transform/NewGVN are a copy of the ones in GVN, with proper `XFAIL` (missing features in NewGVN). A flag will be added in a future commit to enable NewGVN, so that interested parties can exercise this code easily. Differential Revision: https://reviews.llvm.org/D26224 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290346 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1.2 KiB
LLVM
44 lines
1.2 KiB
LLVM
; RUN: opt -scoped-noalias -basicaa -newgvn -S < %s | FileCheck %s
|
|
|
|
define i32 @test1(i32* %p, i32* %q) {
|
|
; CHECK-LABEL: @test1(i32* %p, i32* %q)
|
|
; CHECK: load i32, i32* %p
|
|
; CHECK-NOT: noalias
|
|
; CHECK: %c = add i32 %a, %a
|
|
%a = load i32, i32* %p, !noalias !0
|
|
%b = load i32, i32* %p
|
|
%c = add i32 %a, %b
|
|
ret i32 %c
|
|
}
|
|
|
|
define i32 @test2(i32* %p, i32* %q) {
|
|
; CHECK-LABEL: @test2(i32* %p, i32* %q)
|
|
; CHECK: load i32, i32* %p, !alias.scope !0
|
|
; CHECK: %c = add i32 %a, %a
|
|
%a = load i32, i32* %p, !alias.scope !0
|
|
%b = load i32, i32* %p, !alias.scope !0
|
|
%c = add i32 %a, %b
|
|
ret i32 %c
|
|
}
|
|
|
|
; FIXME: In this case we can do better than intersecting the scopes, and can
|
|
; concatenate them instead. Both loads are in the same basic block, the first
|
|
; makes the second safe to speculatively execute, and there are no calls that may
|
|
; throw in between.
|
|
define i32 @test3(i32* %p, i32* %q) {
|
|
; CHECK-LABEL: @test3(i32* %p, i32* %q)
|
|
; CHECK: load i32, i32* %p, !alias.scope !1
|
|
; CHECK: %c = add i32 %a, %a
|
|
%a = load i32, i32* %p, !alias.scope !1
|
|
%b = load i32, i32* %p, !alias.scope !2
|
|
%c = add i32 %a, %b
|
|
ret i32 %c
|
|
}
|
|
|
|
declare i32 @foo(i32*) readonly
|
|
|
|
!0 = !{!0}
|
|
!1 = !{!1}
|
|
!2 = !{!0, !1}
|
|
|