https://bugs.llvm.org/show_bug.cgi?id=32001
Bug ID: 32001
Summary: Regression with r279460 getelementptr argument goes
missing
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: opt
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 18005
--> https://bugs.llvm.org/attachment.cgi?id=18005&action=edit
Unoptimised shader
commit f991e38d156c4c10c609ca8425a7c31b951ecbed
Author: James Molloy <[email protected]>
Date: Thu Sep 1 10:44:35 2016 +0000
[SimplifyCFG] Change the algorithm in SinkThenElseCodeToEnd
r279460 rewrote this function to be able to handle more than two incoming
edges and took pains to ensure this didn't regress anything.
On AMGGPU at least this caused a regression (possibly indirectly). I've
included a before and after bellow, you can see that the !amdgpu.uniform !0
goes missing.
I've attached the unoptimised version. I tried to debug this with 'lcc
-march=amdgcn -mcpu=polaris10 llvm_broken_preopt.ll' but it didn't seem to hit
the SimplifyCFG path when doing this.
BEFORE:
br i1 %27, label %else5, label %if1
if1: ; preds = %main_body
%30 = getelementptr [32 x <8 x i32>], [32 x <8 x i32>] addrspace(2)* %2, i64
0, i64 0, !amdgpu.uniform !0
%31 = load <8 x i32>, <8 x i32> addrspace(2)* %30, align 32, !invariant.load
!0
%32 = bitcast [32 x <8 x i32>] addrspace(2)* %2 to [0 x <4 x i32>]
addrspace(2)*
%33 = getelementptr [0 x <4 x i32>], [0 x <4 x i32>] addrspace(2)* %32, i64
0, i64 3, !amdgpu.uniform !0
%34 = load <4 x i32>, <4 x i32> addrspace(2)* %33, align 16, !invariant.load
!0
%35 = bitcast float %28 to i32
%36 = bitcast float %29 to i32
%37 = insertelement <2 x i32> undef, i32 %35, i32 0
%38 = insertelement <2 x i32> %37, i32 %36, i32 1
%39 = call <4 x float> @llvm.SI.image.sample.v2i32(<2 x i32> %38, <8 x i32>
%31, <4 x i32> %34, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
br label %endif9
else5: ; preds = %main_body
%40 = getelementptr [32 x <8 x i32>], [32 x <8 x i32>] addrspace(2)* %2, i64
0, i64 2, !amdgpu.uniform !0
%41 = load <8 x i32>, <8 x i32> addrspace(2)* %40, align 32, !invariant.load
!0
%42 = bitcast [32 x <8 x i32>] addrspace(2)* %2 to [0 x <4 x i32>]
addrspace(2)*
%43 = getelementptr [0 x <4 x i32>], [0 x <4 x i32>] addrspace(2)* %42, i64
0, i64 7, !amdgpu.uniform !0
%44 = load <4 x i32>, <4 x i32> addrspace(2)* %43, align 16, !invariant.load
!0
%45 = bitcast float %28 to i32
%46 = bitcast float %29 to i32
%47 = insertelement <2 x i32> undef, i32 %45, i32 0
%48 = insertelement <2 x i32> %47, i32 %46, i32 1
%49 = call <4 x float> @llvm.SI.image.sample.v2i32(<2 x i32> %48, <8 x i32>
%41, <4 x i32> %44, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
br label %endif9
endif9:
AFTER:
%30 = select i1 %27, i64 0, i64 2
%31 = getelementptr [32 x <8 x i32>], [32 x <8 x i32>] addrspace(2)* %2, i64
0, i64 %30
%32 = load <8 x i32>, <8 x i32> addrspace(2)* %31, align 32, !invariant.load
!0
%33 = bitcast [32 x <8 x i32>] addrspace(2)* %2 to [0 x <4 x i32>]
addrspace(2)*
%34 = select i1 %27, i64 3, i64 7
%35 = getelementptr [0 x <4 x i32>], [0 x <4 x i32>] addrspace(2)* %33, i64
0, i64 %34
%36 = load <4 x i32>, <4 x i32> addrspace(2)* %35, align 16, !invariant.load
!0
%37 = bitcast float %28 to i32
%38 = bitcast float %29 to i32
%39 = insertelement <2 x i32> undef, i32 %37, i32 0
%40 = insertelement <2 x i32> %39, i32 %38, i32 1
%41 = call <4 x float> @llvm.SI.image.sample.v2i32(<2 x i32> %40, <8 x i32>
%32, <4 x i32> %36, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
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