[NFC] [IndVarSimplify] Add non-overflowing usub test#159683
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fmayer merged 3 commits intoSep 21, 2025
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@llvm/pr-subscribers-llvm-transforms Author: Florian Mayer (fmayer) ChangesWe would reenter the lloop with %i.04 being 0, so the usub would Full diff: https://github.com/llvm/llvm-project/pull/159683.diff 1 Files Affected:
diff --git a/llvm/test/Transforms/IndVarSimplify/X86/overflow-intrinsics.ll b/llvm/test/Transforms/IndVarSimplify/X86/overflow-intrinsics.ll
index e678146c80af8..c7db8b962f3d6 100644
--- a/llvm/test/Transforms/IndVarSimplify/X86/overflow-intrinsics.ll
+++ b/llvm/test/Transforms/IndVarSimplify/X86/overflow-intrinsics.ll
@@ -109,12 +109,9 @@ for.body: ; preds = %entry, %cont
%0 = tail call { i32, i1 } @llvm.usub.with.overflow.i32(i32 %i.04, i32 1)
%1 = extractvalue { i32, i1 } %0, 1
-; It is theoretically possible to prove this, but SCEV cannot
-; represent non-unsigned-wrapping subtraction operations.
-
; CHECK: for.body:
-; CHECK: [[COND:%[^ ]+]] = extractvalue { i32, i1 } %1, 1
-; CHECK-NEXT: br i1 [[COND]], label %trap, label %cont, !nosanitize !0
+; CHECK-NOT: @llvm.usub.with.overflow.i32
+; CHECK: br i1 false, label %trap, label %cont, !nosanitize !0
br i1 %1, label %trap, label %cont, !nosanitize !{}
trap: ; preds = %for.body
@@ -123,7 +120,7 @@ trap: ; preds = %for.body
cont: ; preds = %for.body
%2 = extractvalue { i32, i1 } %0, 0
- %cmp = icmp sgt i32 %2, -1
+ %cmp = icmp sgt i32 %2, 0
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
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fhahn
reviewed
Sep 19, 2025
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/41/builds/9067 Here is the relevant piece of the build log for the reference |
ckoparkar
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Sep 23, 2025
* main: (1562 commits) Document Policy on supporting newer C++ standard in LLVM codebase (llvm#156823) [MLIR][Transform][SMT] Introduce transform.smt.constrain_params (llvm#159450) Reapply "[compiler-rt] Remove %T from shared object substitutions (llvm#155302)" [NFC] [IndVarSimplify] Add non-overflowing usub test (llvm#159683) [Github] Remove separate tools checkout from pr-code workflows (llvm#159967) [clang] fix using enum redecl in template regression (llvm#159996) [DAG] Skip `mstore` combine for `<1 x ty>` vectors (llvm#159915) [mlir] Expose optional `PatternBenefit` to `func` populate functions (NFC) (llvm#159986) [LV] Set correct costs for interleave group members. [clang] ast-dump: use template pattern for `instantiated_from` (llvm#159952) [ARM] ha-alignstack-call.ll - regenerate test checks (llvm#159988) [LLD][MachO] Silence warning when building with MSVC [llvm][Analysis] Silence warning when building with MSVC [LV] Skip select cost for invariant divisors in legacy cost model. [Clang] Fix an error-recovery crash after d1a80de (llvm#159976) [VPlanPatternMatch] Introduce m_ConstantInt (llvm#159558) [GlobalISel] Add G_ABS computeKnownBits (llvm#154413) [gn build] Port 4cabd1e Reland "[clangd] Add feature modules registry" (llvm#154836) [LV] Also handle non-uniform scalarized loads when processing AddrDefs. ...
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We would reenter the loop with %i.04 being 0, so the usub would
overflow to -1. This was the only test in this file that had
an overflow in the loop, the other ones did not.