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llvm-reduce: Avoid using constantdata uselistorder in thinlto test #136288

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Apr 18, 2025
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llvm-reduce: Avoid using constantdata uselistorder in thinlto test #136288

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59 changes: 44 additions & 15 deletions llvm/test/tools/llvm-reduce/thinlto-preserve-uselistorder.ll
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Original file line number Diff line number Diff line change
@@ -1,19 +1,48 @@
; RUN: opt --thinlto-bc --thinlto-split-lto-unit %s -o %t.0
; RUN: llvm-reduce -write-tmp-files-as-bitcode --delta-passes=instructions %t.0 -o %t.1 \
; RUN: opt --preserve-bc-uselistorder --thinlto-bc --thinlto-split-lto-unit %s -o %t.0

; RUN: llvm-reduce -j=2 --delta-passes=instructions %t.0 -o %t.1 \
; RUN: --test %python --test-arg %p/Inputs/llvm-dis-and-filecheck.py --test-arg llvm-dis --test-arg FileCheck --test-arg --check-prefix=INTERESTING --test-arg %s
; RUN: llvm-dis --preserve-ll-uselistorder %t.1 -o %t.2
; RUN: FileCheck --check-prefix=RESULT %s < %t.2

define i32 @func(i32 %arg0, i32 %arg1) {
entry:
%add0 = add i32 %arg0, 0
%add1 = add i32 %add0, 0
%add2 = add i32 %add1, 0
%add3 = add i32 %arg1, 0
%add4 = add i32 %add2, %add3
ret i32 %add4
; RUN: FileCheck --check-prefixes=RESULT,RESULT-PARALLEL %s < %t.2

; FIXME: The single thread path uses CloneModule, which does not
; preserve uselistorder. Consequently it is incapable of reducing
; anything a case that depends on uselistorder.

; RUN: llvm-reduce -j=1 --delta-passes=instructions %t.0 -o %t.3 \
; RUN: --test %python --test-arg %p/Inputs/llvm-dis-and-filecheck.py --test-arg llvm-dis --test-arg FileCheck --test-arg --check-prefix=INTERESTING --test-arg %s
; RUN: llvm-dis --preserve-ll-uselistorder %t.3 -o %t.4
; RUN: FileCheck --check-prefixes=RESULT,RESULT-SINGLE %s < %t.4

@gv0 = external global [0 x i8]

; RESULT-LABEL: @func(
; RESULT-PARALLEL-NEXT: %gep0 = getelementptr i8, ptr @gv0, i32 %arg0
; RESULT-PARALLEL-NEXT: %gep1 = getelementptr i8, ptr @gv0, i32 %arg1
; RESULT-PARALLEL-NEXT: ret void

; RESULT-SINGLE: ptr @gv0
; RESULT-SINGLE: ptr @gv0
; RESULT-SINGLE: ptr @gv0
; RESULT-SINGLE: ptr @gv0
; RESULT-SINGLE: ptr @gv0
define void @func(i32 %arg0, i32 %arg1, i32 %arg2, i32 %arg3) {
%gep0 = getelementptr i8, ptr @gv0, i32 %arg0
%gep1 = getelementptr i8, ptr @gv0, i32 %arg1
%gep2 = getelementptr i8, ptr @gv0, i32 %arg2
%gep3 = getelementptr i8, ptr @gv0, i32 %arg3
store i32 0, ptr %gep0
store i32 0, ptr %gep1
store i32 0, ptr %gep2
store i32 0, ptr %gep3
store i32 0, ptr @gv0
ret void
}

; INTERESTING: uselistorder i32 0
; RESULT: uselistorder i32 0, { 0, 2, 1 }
uselistorder i32 0, { 3, 2, 1, 0 }
; INTERESTING: uselistorder ptr

; RESULT: uselistorder directives
; RESULT-PARALLEL: uselistorder ptr @gv0, { 1, 0 }
; RESULT-SINGLE: uselistorder ptr @gv0, { 3, 4, 2, 1, 0 }

uselistorder ptr @gv0, { 3, 4, 2, 1, 0 }
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