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AMDGPU: Improve alias analysis for GDS

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Summary: GDS cannot alias anything else.

Original patch by: Marek Olšák

Reviewers: arsenm, mareko

Subscribers: kzhuravl, jvesely, wdng, yaxunl, dstuttard, tpr, t-tye, Petar.Avramovic, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64114

Change-Id: I07bfbd96f5d5c37a6dfba7997df12f291dd794b0
llvm-svn: 366313
This commit is contained in:
Nicolai Haehnle 2019-07-17 11:22:19 +00:00
parent 2e592185f9
commit b38a60e03a
2 changed files with 47 additions and 12 deletions
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8
lib/Target/AMDGPU/AMDGPUAliasAnalysis.cpp
View File

@ -56,13 +56,13 @@ void AMDGPUAAWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
// These arrays are indexed by address space value enum elements 0 ... to 7
static const AliasResult ASAliasRules[8][8] = {
/* Flat Global Region Group Constant Private Constant 32-bit Buffer Fat Ptr */
/* Flat */ {MayAlias, MayAlias, MayAlias, MayAlias, MayAlias, MayAlias, MayAlias, MayAlias},
/* Flat */ {MayAlias, MayAlias, NoAlias, MayAlias, MayAlias, MayAlias, MayAlias, MayAlias},
/* Global */ {MayAlias, MayAlias, NoAlias , NoAlias , MayAlias, NoAlias , MayAlias, MayAlias},
/* Region */ {MayAlias, NoAlias , NoAlias , NoAlias , MayAlias, NoAlias , MayAlias, NoAlias},
/* Region */ {NoAlias, NoAlias , MayAlias, NoAlias , NoAlias, NoAlias , NoAlias, NoAlias},
/* Group */ {MayAlias, NoAlias , NoAlias , MayAlias, NoAlias , NoAlias , NoAlias , NoAlias},
/* Constant */ {MayAlias, MayAlias, MayAlias, NoAlias , NoAlias , NoAlias , MayAlias, MayAlias},
/* Constant */ {MayAlias, MayAlias, NoAlias, NoAlias , NoAlias , NoAlias , MayAlias, MayAlias},
/* Private */ {MayAlias, NoAlias , NoAlias , NoAlias , NoAlias , MayAlias, NoAlias , NoAlias},
/* Constant 32-bit */ {MayAlias, MayAlias, MayAlias, NoAlias , MayAlias, NoAlias , NoAlias , MayAlias},
/* Constant 32-bit */ {MayAlias, MayAlias, NoAlias, NoAlias , MayAlias, NoAlias , NoAlias , MayAlias},
/* Buffer Fat Ptr */ {MayAlias, MayAlias, NoAlias , NoAlias , MayAlias, NoAlias , MayAlias, MayAlias}
};

51
test/CodeGen/AMDGPU/amdgpu-alias-analysis.ll
View File

@ -51,42 +51,77 @@ define void @test_999_1(i8 addrspace(999)* %p, i8 addrspace(1)* %p1) {
ret void
}
; CHECK: NoAlias: i8 addrspace(2)* %p, i8* %p1
define void @test_region_vs_flat(i8 addrspace(2)* %p, i8 addrspace(0)* %p1) {
ret void
}
; CHECK: NoAlias: i8 addrspace(1)* %p1, i8 addrspace(2)* %p
define void @test_region_vs_global(i8 addrspace(2)* %p, i8 addrspace(1)* %p1) {
ret void
}
; CHECK: MayAlias: i8 addrspace(2)* %p, i8 addrspace(2)* %p1
define void @test_region(i8 addrspace(2)* %p, i8 addrspace(2)* %p1) {
ret void
}
; CHECK: NoAlias: i8 addrspace(2)* %p, i8 addrspace(3)* %p1
define void @test_region_vs_group(i8 addrspace(2)* %p, i8 addrspace(3)* %p1) {
ret void
}
; CHECK: NoAlias: i8 addrspace(2)* %p, i8 addrspace(4)* %p1
define void @test_region_vs_constant(i8 addrspace(2)* %p, i8 addrspace(4)* %p1) {
ret void
}
; CHECK: NoAlias: i8 addrspace(2)* %p, i8 addrspace(5)* %p1
define void @test_region_vs_private(i8 addrspace(2)* %p, i8 addrspace(5)* %p1) {
ret void
}
; CHECK: NoAlias: i8 addrspace(2)* %p, i8 addrspace(6)* %p1
define void @test_region_vs_const32(i8 addrspace(2)* %p, i8 addrspace(6)* %p1) {
ret void
}
; CHECK: MayAlias: i8 addrspace(7)* %p, i8* %p1
define void @test_7_0(i8 addrspace(7)* %p, i8 addrspace(0)* %p1) {
ret void
ret void
}
; CHECK: MayAlias: i8 addrspace(1)* %p1, i8 addrspace(7)* %p
define void @test_7_1(i8 addrspace(7)* %p, i8 addrspace(1)* %p1) {
ret void
ret void
}
; CHECK: NoAlias: i8 addrspace(2)* %p1, i8 addrspace(7)* %p
define void @test_7_2(i8 addrspace(7)* %p, i8 addrspace(2)* %p1) {
ret void
ret void
}
; CHECK: NoAlias: i8 addrspace(3)* %p1, i8 addrspace(7)* %p
define void @test_7_3(i8 addrspace(7)* %p, i8 addrspace(3)* %p1) {
ret void
ret void
}
; CHECK: MayAlias: i8 addrspace(4)* %p1, i8 addrspace(7)* %p
define void @test_7_4(i8 addrspace(7)* %p, i8 addrspace(4)* %p1) {
ret void
ret void
}
; CHECK: NoAlias: i8 addrspace(5)* %p1, i8 addrspace(7)* %p
define void @test_7_5(i8 addrspace(7)* %p, i8 addrspace(5)* %p1) {
ret void
ret void
}
; CHECK: MayAlias: i8 addrspace(6)* %p1, i8 addrspace(7)* %p
define void @test_7_6(i8 addrspace(7)* %p, i8 addrspace(6)* %p1) {
ret void
ret void
}
; CHECK: MayAlias: i8 addrspace(7)* %p, i8 addrspace(7)* %p1
define void @test_7_7(i8 addrspace(7)* %p, i8 addrspace(7)* %p1) {
ret void
ret void
}