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[FMV][GlobalOpt] Do not statically resolve non-FMV callers. #123383

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Jan 17, 2025
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[FMV][GlobalOpt] Do not statically resolve non-FMV callers. #123383

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[FMV][GlobalOpt] Do not statically resolver non-FMV callers.
labrinea Jan 17, 2025
8a3d433
Update GlobalOpt.cpp
labrinea Jan 17, 2025
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12 changes: 10 additions & 2 deletions llvm/lib/Transforms/IPO/GlobalOpt.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2785,8 +2785,16 @@ static bool OptimizeNonTrivialIFuncs(
} else {
// We can't reason much about non-FMV callers. Just pick the highest
// priority callee if it matches, otherwise bail.
if (I > 0 || !implies(CallerBits, CalleeBits))
continue;
// if (I > 0 || !implies(CallerBits, CalleeBits))
//
// FIXME: This is causing a regression in the llvm test suite,
// specifically a 'predres' version is unexpectedly trapping on
// GravitonG4. My explanation is that when the caller in not a
// versioned function, the compiler exclusively relies on the
// command line option, or target attribute to deduce whether a
// feature is available. However, there is no guarantee that in
// reality the host supports those implied features.
continue;
}
auto &Calls = CallSites[Caller];
for (CallBase *CS : Calls)
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2 changes: 1 addition & 1 deletion llvm/test/Transforms/GlobalOpt/resolve-fmv-ifunc.ll
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Expand Up @@ -221,7 +221,7 @@ resolver_entry:
define i32 @caller4() #8 {
; CHECK-LABEL: define i32 @caller4(
; CHECK-SAME: ) local_unnamed_addr #[[ATTR7:[0-9]+]] {
; CHECK: [[CALL:%.*]] = tail call i32 @test_non_fmv_caller._Maes()
; CHECK: [[CALL:%.*]] = tail call i32 @test_non_fmv_caller()
;
entry:
%call = tail call i32 @test_non_fmv_caller()
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