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opt: Add -enable-builtin flag #145808

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Merged
merged 1 commit into from
Jul 8, 2025
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opt: Add -enable-builtin flag #145808

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13 changes: 13 additions & 0 deletions llvm/test/Transforms/InferFunctionAttrs/enable-builtin.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
; RUN: opt -S -mtriple=amdgcn-- -passes=inferattrs %s | FileCheck -check-prefix=NOBUILTIN %s
; RUN: opt -S -enable-builtin=malloc -mtriple=amdgcn-- -passes=inferattrs %s | FileCheck -check-prefix=WITHBUILTIN %s

; Test that the -enable-builtin flag works and forces recognition of
; malloc despite the target's default TargetLibraryInfo.

; NOBUILTIN: declare ptr @malloc(i64)

; WITHBUILTIN: declare noalias noundef ptr @malloc(i64 noundef) #0
; WITHBUILTIN: attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" }

declare ptr @malloc(i64)

17 changes: 16 additions & 1 deletion llvm/tools/opt/optdriver.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -203,6 +203,10 @@ static cl::list<std::string> DisableBuiltins(
"disable-builtin",
cl::desc("Disable specific target library builtin function"));

static cl::list<std::string> EnableBuiltins(
"enable-builtin",
cl::desc("Enable specific target library builtin functions"));

static cl::opt<bool> EnableDebugify(
"enable-debugify",
cl::desc(
Expand Down Expand Up @@ -670,14 +674,25 @@ extern "C" int optMain(
else {
// Disable individual builtin functions in TargetLibraryInfo.
LibFunc F;
for (auto &FuncName : DisableBuiltins)
for (auto &FuncName : DisableBuiltins) {
if (TLII.getLibFunc(FuncName, F))
TLII.setUnavailable(F);
else {
errs() << argv[0] << ": cannot disable nonexistent builtin function "
<< FuncName << '\n';
return 1;
}
}

for (auto &FuncName : EnableBuiltins) {
if (TLII.getLibFunc(FuncName, F))
TLII.setAvailable(F);
else {
errs() << argv[0] << ": cannot enable nonexistent builtin function "
<< FuncName << '\n';
return 1;
}
}
}

if (UseNPM) {
Expand Down