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llvm-reduce: Fix introducing invalid uses of intrinsics

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This commit is contained in:
Matt Arsenault 2023-06-19 20:47:29 -04:00
parent bc1fb56661
commit 29ce3678c0
2 changed files with 51 additions and 0 deletions
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45
llvm/test/tools/llvm-reduce/operands-skip-intrinsics.ll Normal file
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@ -0,0 +1,45 @@
; RUN: llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-skip --test FileCheck --test-arg --check-prefixes=INTERESTING --test-arg %s --test-arg --input-file %s -o %t
; RUN: FileCheck --check-prefixes=CHECK %s < %t
; Make sure address captures of intrinsics are not introduced.
declare ptr @fptr()
declare ptr @fptr.keep()
declare ptr @llvm.intrin()
declare ptr @llvm.intrin.keep()
declare void @func(i32, ptr)
declare ptr @llvm.intrin2()
declare ptr @llvm.intrin.chain(ptr)
; INTERESTING-LABEL: define void @caller(
; INTERESTING: call void @func(i32 1
; INTERESTING: call void @func(i32 3
; INTERESTING: call void @func(i32 4
; INTERESTING: call void @func(i32 5
; CHECK: %intrin.ptr.keep = call ptr @llvm.intrin.keep()
; CHECK: call void @func(i32 0, ptr @fptr)
; CHECK: call void @func(i32 1, ptr @fptr.keep)
; CHECK: call void @func(i32 2, ptr %intrin.ptr)
; CHECK: call void @func(i32 3, ptr %intrin.ptr.keep)
; CHECK: call void @func(i32 4, ptr %intrin.ptr.keep)
; CHECK: call void @func(i32 5, ptr %chained.ptr)
define void @caller() {
%func.ptr = call ptr @fptr()
%func.ptr.keep = call ptr @fptr.keep()
%intrin.ptr = call ptr @llvm.intrin()
%intrin.ptr.keep = call ptr @llvm.intrin.keep()
%gep = getelementptr i8, ptr %intrin.ptr.keep, i64 128
%chained.ptr = call ptr @llvm.intrin2()
%chain.ptr = call ptr @llvm.intrin.chain(ptr %chained.ptr)
call void @func(i32 0, ptr %func.ptr)
call void @func(i32 1, ptr %func.ptr.keep)
call void @func(i32 2, ptr %intrin.ptr)
call void @func(i32 3, ptr %intrin.ptr.keep)
call void @func(i32 4, ptr %gep)
call void @func(i32 5, ptr %chain.ptr)
ret void
}

6
llvm/tools/llvm-reduce/deltas/ReduceOperandsSkip.cpp
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@ -163,6 +163,12 @@ opportunities(Function &F,
if (OpVal->getType() != V->getType())
return true;
// Do not introduce address captures of intrinsics.
if (Function *F = dyn_cast<Function>(V)) {
if (F->isIntrinsic())
return true;
}
// Only consider candidates that are "more reduced" than the original
// value. This explicitly also rules out candidates with the same
// reduction power. This is to ensure that repeated invocations of this