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[BPF] Define set of BPF libcalls #169537

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[BPF] Define set of BPF libcalls #169537

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19 changes: 18 additions & 1 deletion llvm/include/llvm/IR/RuntimeLibcalls.td
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Original file line number Diff line number Diff line change
Expand Up @@ -2808,13 +2808,30 @@ def WasmSystemLibrary
emscripten_return_address,
__stack_chk_fail, __stack_chk_guard)>;

//===----------------------------------------------------------------------===//
// BPF Runtime Libcalls
//===----------------------------------------------------------------------===//

def isBPF : RuntimeLibcallPredicate<"TT.isBPF()">;

def BPFSystemLibrary
: SystemRuntimeLibrary<isBPF,
(add (sub DefaultRuntimeLibcallImpls,
// i128 operations should be lowered by LLVM for BPF
__divti3,
__udivti3,
__modti3,
__umodti3,
__clzti2
))>;

//===----------------------------------------------------------------------===//
// Legacy Default Runtime Libcalls
//===----------------------------------------------------------------------===//

// TODO: Should make every target explicit.
def isDefaultLibcallArch : RuntimeLibcallPredicate<[{
TT.isMIPS() || TT.isLoongArch() || TT.isVE() || TT.isBPF() ||
TT.isMIPS() || TT.isLoongArch() || TT.isVE() ||
TT.getArch() == Triple::csky || TT.getArch() == Triple::arc ||
TT.getArch() == Triple::m68k || TT.getArch() == Triple::xtensa ||
(TT.isSystemZ() && !TT.isOSzOS())
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39 changes: 0 additions & 39 deletions llvm/test/CodeGen/BPF/builtin_calls.ll
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23 changes: 23 additions & 0 deletions llvm/test/CodeGen/BPF/i128_math.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
; RUN: llc -march=bpfel < %s | FileCheck %s
;
; C code for this test case:
;
; long func(long a, long b) {
; long x;
; return __builtin_mul_overflow(a, b, &x);
; }


declare { i64, i1 } @llvm.smul.with.overflow.i64(i64, i64)

define noundef range(i64 0, 2) i64 @func(i64 noundef %a, i64 noundef %b) local_unnamed_addr {
entry:
%0 = tail call { i64, i1 } @llvm.smul.with.overflow.i64(i64 %a, i64 %b)
%1 = extractvalue { i64, i1 } %0, 1
%conv = zext i1 %1 to i64
ret i64 %conv
}

; CHECK-LABEL: func
; CHECK-NOT: call __multi3
; CHECK: exit