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Replace SingleUseConsts by GVN. #147079

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@cjgillot cjgillot commented Sep 26, 2025

r? @ghost

@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 26, 2025
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@bors try @rust-timer queue

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rust-bors bot added a commit that referenced this pull request Sep 26, 2025
@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 26, 2025
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The job aarch64-gnu-llvm-20-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot) 

---- [codegen] tests/codegen-llvm/amdgpu-addrspacecast.rs stdout ----
------FileCheck stdout------------------------------
------FileCheck stderr------------------------------
/checkout/tests/codegen-llvm/amdgpu-addrspacecast.rs:13:11: error: CHECK: expected string not found in input
// CHECK: %i = addrspacecast ptr addrspace(5) [[alloca]] to ptr
 ^
/checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll:11:13: note: scanning from here
 %0 = alloca [4 x i8], align 4, addrspace(5)
 ^
/checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll:11:13: note: with "alloca" equal to "%0"
 %0 = alloca [4 x i8], align 4, addrspace(5)
 ^
/checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll:12:3: note: possible intended match here
 %_2 = addrspacecast ptr addrspace(5) %0 to ptr
 ^
Input file: /checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll
Check file: /checkout/tests/codegen-llvm/amdgpu-addrspacecast.rs
-dump-input=help explains the following input dump.
Input was:
<<<<<<
 1: ; ModuleID = 'amdgpu_addrspacecast.8718c542dfbe9a16-cgu.0' 
 2: source_filename = "amdgpu_addrspacecast.8718c542dfbe9a16-cgu.0" 
 3: target datalayout = "e-p:64:64-p1:64:64-p2:32:32-p3:32:32-p4:64:64-p5:32:32-p6:32:32-p7:160:256:256:32-p8:128:128-p9:192:256:256:32-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-S32-A5-G1-ni:7:8:9" 
 4: target triple = "amdgcn-amd-amdhsa" 
 5: 
 6: @I = addrspace(1) constant [4 x i8] zeroinitializer, align 4 
 7: 
 8: ; Function Attrs: nounwind uwtable 
 9: define void @ref_of_local(ptr nocapture noundef nonnull readonly %f) unnamed_addr #0 { 
 10: start: 
 11: %0 = alloca [4 x i8], align 4, addrspace(5) 
check:13'0 X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
check:13'1 with "alloca" equal to "%0"
 12: %_2 = addrspacecast ptr addrspace(5) %0 to ptr 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:13'2 ? possible intended match
 13: call void @llvm.lifetime.start.p0(i64 4, ptr %_2) 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 14: store i32 0, ptr addrspace(5) %0, align 4 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 15: call void %f(ptr noalias noundef nonnull readonly align 4 dereferenceable(4) %_2) #2 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 16: call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %_2) 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 17: ret void 
check:13'0 ~~~~~~~~~~
 18: } 
check:13'0 ~~
 19: 
check:13'0 ~
 20: ; Function Attrs: nounwind uwtable 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 21: define void @ref_of_global(ptr nocapture noundef nonnull readonly %f) unnamed_addr #0 { 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 22: start: 
 23: tail call void %f(ptr noalias noundef readonly align 4 dereferenceable(4) addrspacecast (ptr addrspace(1) @I to ptr)) #2 
 24: ret void 
 25: } 
 26: 
 27: ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) 
 28: declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 
 29: 
 30: ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) 
 31: declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 
 32: 
 33: attributes #0 = { nounwind uwtable "target-cpu"="gfx900" } 
 34: attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) } 
 35: attributes #2 = { nounwind } 
 36: 
 37: !llvm.module.flags = !{!0} 
 38: !llvm.ident = !{!1} 
 39: 
 40: !0 = !{i32 8, !"PIC Level", i32 2} 
 41: !1 = !{!"rustc version 1.92.0-nightly (ff28410a3 2025年09月26日)"} 
>>>>>>
------------------------------------------
error: verification with 'FileCheck' failed
status: exit status: 1
command: "/usr/lib/llvm-20/bin/FileCheck" "--input-file" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll" "/checkout/tests/codegen-llvm/amdgpu-addrspacecast.rs" "--check-prefix=CHECK" "--allow-unused-prefixes" "--dump-input-context" "100"
stdout: none
--- stderr -------------------------------
/checkout/tests/codegen-llvm/amdgpu-addrspacecast.rs:13:11: error: CHECK: expected string not found in input
// CHECK: %i = addrspacecast ptr addrspace(5) [[alloca]] to ptr
 ^
/checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll:11:13: note: scanning from here
 %0 = alloca [4 x i8], align 4, addrspace(5)
 ^
/checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll:11:13: note: with "alloca" equal to "%0"
 %0 = alloca [4 x i8], align 4, addrspace(5)
 ^
/checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll:12:3: note: possible intended match here
 %_2 = addrspacecast ptr addrspace(5) %0 to ptr
 ^
Input file: /checkout/obj/build/aarch64-unknown-linux-gnu/test/codegen-llvm/amdgpu-addrspacecast/amdgpu-addrspacecast.ll
Check file: /checkout/tests/codegen-llvm/amdgpu-addrspacecast.rs
-dump-input=help explains the following input dump.
Input was:
<<<<<<
 1: ; ModuleID = 'amdgpu_addrspacecast.8718c542dfbe9a16-cgu.0' 
 2: source_filename = "amdgpu_addrspacecast.8718c542dfbe9a16-cgu.0" 
 3: target datalayout = "e-p:64:64-p1:64:64-p2:32:32-p3:32:32-p4:64:64-p5:32:32-p6:32:32-p7:160:256:256:32-p8:128:128-p9:192:256:256:32-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-S32-A5-G1-ni:7:8:9" 
 4: target triple = "amdgcn-amd-amdhsa" 
 5: 
 6: @I = addrspace(1) constant [4 x i8] zeroinitializer, align 4 
 7: 
 8: ; Function Attrs: nounwind uwtable 
 9: define void @ref_of_local(ptr nocapture noundef nonnull readonly %f) unnamed_addr #0 { 
 10: start: 
 11: %0 = alloca [4 x i8], align 4, addrspace(5) 
check:13'0 X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
check:13'1 with "alloca" equal to "%0"
 12: %_2 = addrspacecast ptr addrspace(5) %0 to ptr 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:13'2 ? possible intended match
 13: call void @llvm.lifetime.start.p0(i64 4, ptr %_2) 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 14: store i32 0, ptr addrspace(5) %0, align 4 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 15: call void %f(ptr noalias noundef nonnull readonly align 4 dereferenceable(4) %_2) #2 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 16: call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %_2) 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 17: ret void 
check:13'0 ~~~~~~~~~~
 18: } 
check:13'0 ~~
 19: 
check:13'0 ~
 20: ; Function Attrs: nounwind uwtable 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 21: define void @ref_of_global(ptr nocapture noundef nonnull readonly %f) unnamed_addr #0 { 
check:13'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 22: start: 
 23: tail call void %f(ptr noalias noundef readonly align 4 dereferenceable(4) addrspacecast (ptr addrspace(1) @I to ptr)) #2 
 24: ret void 
 25: } 
 26: 
 27: ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) 
 28: declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 
 29: 
 30: ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) 
 31: declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 
 32: 
 33: attributes #0 = { nounwind uwtable "target-cpu"="gfx900" } 
 34: attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) } 
 35: attributes #2 = { nounwind } 
 36: 
 37: !llvm.module.flags = !{!0} 
 38: !llvm.ident = !{!1} 
 39: 
 40: !0 = !{i32 8, !"PIC Level", i32 2} 
 41: !1 = !{!"rustc version 1.92.0-nightly (ff28410a3 2025年09月26日)"} 
>>>>>>
------------------------------------------
---- [codegen] tests/codegen-llvm/amdgpu-addrspacecast.rs stdout end ----

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rust-bors bot commented Sep 26, 2025

☀️ Try build successful (CI)
Build commit: 70aac37 (70aac379929263ba1dd1d7cb6838e7e6b58c5d2b, parent: 54a8a1db604e4caff93e26e167ad4a6fde9f0681)

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Finished benchmarking commit (70aac37): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @rustbot label: +perf-regression-triaged. If not, please fix the regressions and do another perf run. If its results are neutral or positive, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

mean range count
Regressions ❌
(primary)		 0.7% [0.1%, 2.9%] 18
Regressions ❌
(secondary)		 0.1% [0.1%, 0.1%] 2
Improvements ✅
(primary)		 -0.3% [-0.6%, -0.2%] 15
Improvements ✅
(secondary)		 -0.2% [-0.3%, -0.1%] 4
All ❌✅ (primary) 0.3% [-0.6%, 2.9%] 33

Max RSS (memory usage)

Results (primary -0.9%, secondary 4.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 1.9% [1.0%, 2.9%] 5
Regressions ❌
(secondary)		 4.1% [0.7%, 5.0%] 8
Improvements ✅
(primary)		 -3.3% [-5.4%, -1.0%] 6
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) -0.9% [-5.4%, 2.9%] 11

Cycles

Results (primary -1.9%, secondary -5.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 2.9% [2.9%, 2.9%] 1
Regressions ❌
(secondary)		 2.2% [2.0%, 2.4%] 2
Improvements ✅
(primary)		 -3.5% [-3.8%, -3.2%] 3
Improvements ✅
(secondary)		 -6.2% [-10.6%, -2.4%] 15
All ❌✅ (primary) -1.9% [-3.8%, 2.9%] 4

Binary size

Results (primary -0.1%, secondary -0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 0.2% [0.0%, 1.5%] 38
Regressions ❌
(secondary)		 0.1% [0.0%, 0.6%] 28
Improvements ✅
(primary)		 -0.3% [-0.7%, -0.0%] 70
Improvements ✅
(secondary)		 -0.2% [-0.7%, -0.0%] 27
All ❌✅ (primary) -0.1% [-0.7%, 1.5%] 108

Bootstrap: 471.437s -> 470.824s (-0.13%)
Artifact size: 388.14 MiB -> 388.43 MiB (0.08%)

@rustbot rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Sep 27, 2025
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