[llvm] c921ac7 - [WebAssembly] Enable multivalue return when multivalue ABI is used (#88492)
via llvm-commits
llvm-commits at lists.llvm.org
Tue Apr 23 01:49:02 PDT 2024
Author: Heejin Ahn
Date: 2024-04-23T17:48:59+09:00
New Revision: c921ac724ff06997bab25715786c98d4926b0c0e
URL: https://github.com/llvm/llvm-project/commit/c921ac724ff06997bab25715786c98d4926b0c0e
DIFF: https://github.com/llvm/llvm-project/commit/c921ac724ff06997bab25715786c98d4926b0c0e.diff
LOG: [WebAssembly] Enable multivalue return when multivalue ABI is used (#88492)
Multivalue feature of WebAssembly has been standardized for several
years now. I think it makes sense to be able to enable it in the feature
section by default for our clang/llvm-produced binaries so that the
multivalue feature can be used as necessary when necessary within our
toolchain and also when running other optimizers (e.g. wasm-opt) after
the LLVM code generation.
But some WebAssembly toolchains, such as Emscripten, do not provide both
mulvalue-returning and not-multivalue-returning versions of libraries.
Also allowing the uses of multivalue in the features section does not
necessarily mean we generate them whenever we can to the fullest, which
is a different code generation / optimization option.
So this makes the lowering of multivalue returns conditional on the use
of 'experimental-mv' target ABI. This ABI is turned off by default and
turned on by passing `-Xclang -target-abi -Xclang experimental-mv` to
`clang`, or `-target-abi experimental-mv` to `clang -cc1` or `llc`.
But the purpose of this PR is not tying the multivalue lowering to this
specific 'experimental-mv'. 'experimental-mv' is just one multivalue ABI
we currently have, and it is still experimental, meaning it is not very
well optimized or tuned for performance. (e.g. it does not have the
limitation of the max number of multivalue-lowered values, which can be
detrimental to performance.) We may change the name of this ABI, or
improve it, or add a new multivalue ABI in the future. Also I heard that
WASI is planning to add their multivalue ABI soon. So the plan is,
whenever any one of multivalue ABIs is enabled, we enable the lowering
of multivalue returns in the backend. We currently have only
'experimental-mv' in the repo so we only check for that in this PR.
Related past discussions:
#82714
https://github.com/WebAssembly/tool-conventions/pull/223#issuecomment-2008298652
Added:
Modified:
llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.cpp
llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.h
llvm/lib/Target/WebAssembly/WebAssemblyUtilities.cpp
llvm/lib/Target/WebAssembly/WebAssemblyUtilities.h
llvm/test/CodeGen/WebAssembly/lower-em-ehsjlj-multi-return.ll
llvm/test/CodeGen/WebAssembly/multivalue-dont-move-def-past-use.mir
llvm/test/CodeGen/WebAssembly/multivalue-stackify.ll
llvm/test/CodeGen/WebAssembly/multivalue.ll
llvm/test/CodeGen/WebAssembly/multivalue_libcall.ll
Removed:
################################################################################
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
index 905ff3b9018428..64bcadf3f5677c 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
@@ -1288,7 +1288,7 @@ bool WebAssemblyTargetLowering::CanLowerReturn(
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext & /*Context*/) const {
// WebAssembly can only handle returning tuples with multivalue enabled
- return Subtarget->hasMultivalue() || Outs.size() <= 1;
+ return WebAssembly::canLowerReturn(Outs.size(), Subtarget);
}
SDValue WebAssemblyTargetLowering::LowerReturn(
@@ -1296,7 +1296,7 @@ SDValue WebAssemblyTargetLowering::LowerReturn(
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals, const SDLoc &DL,
SelectionDAG &DAG) const {
- assert((Subtarget->hasMultivalue() || Outs.size() <= 1) &&
+ assert(WebAssembly::canLowerReturn(Outs.size(), Subtarget) &&
"MVP WebAssembly can only return up to one value");
if (!callingConvSupported(CallConv))
fail(DL, DAG, "WebAssembly doesn't support non-C calling conventions");
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.cpp
index 6f4e7d876c693e..7505c2995cf7ef 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.cpp
@@ -17,6 +17,7 @@
#include "Utils/WebAssemblyTypeUtilities.h"
#include "WebAssemblyISelLowering.h"
#include "WebAssemblySubtarget.h"
+#include "WebAssemblyUtilities.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/WasmEHFuncInfo.h"
#include "llvm/Target/TargetMachine.h"
@@ -70,8 +71,9 @@ void llvm::computeSignatureVTs(const FunctionType *Ty,
computeLegalValueVTs(ContextFunc, TM, Ty->getReturnType(), Results);
MVT PtrVT = MVT::getIntegerVT(TM.createDataLayout().getPointerSizeInBits());
- if (Results.size() > 1 &&
- !TM.getSubtarget<WebAssemblySubtarget>(ContextFunc).hasMultivalue()) {
+ if (!WebAssembly::canLowerReturn(
+ Results.size(),
+ &TM.getSubtarget<WebAssemblySubtarget>(ContextFunc))) {
// WebAssembly can't lower returns of multiple values without demoting to
// sret unless multivalue is enabled (see
// WebAssemblyTargetLowering::CanLowerReturn). So replace multiple return
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
index 1896ac631d96e5..d9936557776ba1 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
@@ -20,6 +20,7 @@
#include "WebAssemblyRuntimeLibcallSignatures.h"
#include "WebAssemblySubtarget.h"
+#include "WebAssemblyUtilities.h"
#include "llvm/CodeGen/RuntimeLibcalls.h"
using namespace llvm;
@@ -694,7 +695,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(PtrTy);
break;
case i64_i64_func_f32:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
@@ -703,7 +704,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::F32);
break;
case i64_i64_func_f64:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
@@ -712,7 +713,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::F64);
break;
case i16_i16_func_i16_i16:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I32);
Rets.push_back(wasm::ValType::I32);
} else {
@@ -722,7 +723,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::I32);
break;
case i32_i32_func_i32_i32:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I32);
Rets.push_back(wasm::ValType::I32);
} else {
@@ -732,7 +733,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::I32);
break;
case i64_i64_func_i64_i64:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
@@ -742,7 +743,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::I64);
break;
case i64_i64_func_i64_i64_i64_i64:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
@@ -754,7 +755,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::I64);
break;
case i64_i64_func_i64_i64_i64_i64_iPTR:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
@@ -767,7 +768,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(PtrTy);
break;
case i64_i64_i64_i64_func_i64_i64_i64_i64:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
@@ -781,7 +782,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::I64);
break;
case i64_i64_func_i64_i64_i32:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
@@ -851,7 +852,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::I64);
break;
case i64_i64_func_i64_i64_i64_i64_i64_i64:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
@@ -865,7 +866,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::I64);
break;
case i64_i64_func_i32:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
@@ -874,7 +875,7 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
Params.push_back(wasm::ValType::I32);
break;
case i64_i64_func_i64:
- if (Subtarget.hasMultivalue()) {
+ if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
Rets.push_back(wasm::ValType::I64);
Rets.push_back(wasm::ValType::I64);
} else {
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
index 769ee765e19078..944720c22dea94 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
@@ -128,7 +128,8 @@ WebAssemblyTargetMachine::WebAssemblyTargetMachine(
"n32:64-S128-ni:1:10:20"),
TT, CPU, FS, Options, getEffectiveRelocModel(RM, TT),
getEffectiveCodeModel(CM, CodeModel::Large), OL),
- TLOF(new WebAssemblyTargetObjectFile()) {
+ TLOF(new WebAssemblyTargetObjectFile()),
+ UsesMultivalueABI(Options.MCOptions.getABIName() == "experimental-mv") {
// WebAssembly type-checks instructions, but a noreturn function with a return
// type that doesn't match the context will cause a check failure. So we lower
// LLVM 'unreachable' to ISD::TRAP and then lower that to WebAssembly's
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.h b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.h
index 2e8cd43840e3be..1ff2e175978c31 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.h
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.h
@@ -24,6 +24,7 @@ namespace llvm {
class WebAssemblyTargetMachine final : public LLVMTargetMachine {
std::unique_ptr<TargetLoweringObjectFile> TLOF;
mutable StringMap<std::unique_ptr<WebAssemblySubtarget>> SubtargetMap;
+ bool UsesMultivalueABI = false;
public:
WebAssemblyTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
@@ -62,6 +63,8 @@ class WebAssemblyTargetMachine final : public LLVMTargetMachine {
PerFunctionMIParsingState &PFS,
SMDiagnostic &Error,
SMRange &SourceRange) const override;
+
+ bool usesMultivalueABI() const { return UsesMultivalueABI; }
};
} // end namespace llvm
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.cpp
index ac7cf5b37fcaa4..60e872549f87d9 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.cpp
@@ -13,7 +13,7 @@
#include "WebAssemblyUtilities.h"
#include "WebAssemblyMachineFunctionInfo.h"
-#include "WebAssemblySubtarget.h"
+#include "WebAssemblyTargetMachine.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/IR/Function.h"
@@ -179,3 +179,15 @@ unsigned WebAssembly::getCopyOpcodeForRegClass(const TargetRegisterClass *RC) {
llvm_unreachable("Unexpected register class");
}
}
+
+bool WebAssembly::canLowerMultivalueReturn(
+ const WebAssemblySubtarget *Subtarget) {
+ const auto &TM = static_cast<const WebAssemblyTargetMachine &>(
+ Subtarget->getTargetLowering()->getTargetMachine());
+ return Subtarget->hasMultivalue() && TM.usesMultivalueABI();
+}
+
+bool WebAssembly::canLowerReturn(size_t ResultSize,
+ const WebAssemblySubtarget *Subtarget) {
+ return ResultSize <= 1 || canLowerMultivalueReturn(Subtarget);
+}
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.h b/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.h
index 7f28fb1858a690..046b1b5db2a79c 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.h
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.h
@@ -63,6 +63,16 @@ MachineInstr *findCatch(MachineBasicBlock *EHPad);
/// Returns the appropriate copy opcode for the given register class.
unsigned getCopyOpcodeForRegClass(const TargetRegisterClass *RC);
+/// Returns true if multivalue returns of a function can be lowered directly,
+/// i.e., not indirectly via a pointer parameter that points to the value in
+/// memory.
+bool canLowerMultivalueReturn(const WebAssemblySubtarget *Subtarget);
+
+/// Returns true if the function's return value(s) can be lowered directly,
+/// i.e., not indirectly via a pointer parameter that points to the value in
+/// memory.
+bool canLowerReturn(size_t ResultSize, const WebAssemblySubtarget *Subtarget);
+
} // end namespace WebAssembly
} // end namespace llvm
diff --git a/llvm/test/CodeGen/WebAssembly/lower-em-ehsjlj-multi-return.ll b/llvm/test/CodeGen/WebAssembly/lower-em-ehsjlj-multi-return.ll
index 4f33439db770dc..ae7ad64ffe57ca 100644
--- a/llvm/test/CodeGen/WebAssembly/lower-em-ehsjlj-multi-return.ll
+++ b/llvm/test/CodeGen/WebAssembly/lower-em-ehsjlj-multi-return.ll
@@ -1,5 +1,5 @@
-; RUN: not --crash llc < %s -enable-emscripten-cxx-exceptions -mattr=+multivalue 2>&1 | FileCheck %s --check-prefix=EH
-; RUN: not --crash llc < %s -enable-emscripten-sjlj -mattr=+multivalue 2>&1 | FileCheck %s --check-prefix=SJLJ
+; RUN: not --crash llc < %s -enable-emscripten-cxx-exceptions -mattr=+multivalue -target-abi=experimental-mv 2>&1 | FileCheck %s --check-prefix=EH
+; RUN: not --crash llc < %s -enable-emscripten-sjlj -mattr=+multivalue -target-abi=experimental-mv 2>&1 | FileCheck %s --check-prefix=SJLJ
; Currently multivalue returning functions are not supported in Emscripten EH /
; SjLj. Make sure they error out.
diff --git a/llvm/test/CodeGen/WebAssembly/multivalue-dont-move-def-past-use.mir b/llvm/test/CodeGen/WebAssembly/multivalue-dont-move-def-past-use.mir
index 4b4661b144667f..eb9dfa9dfa60d9 100644
--- a/llvm/test/CodeGen/WebAssembly/multivalue-dont-move-def-past-use.mir
+++ b/llvm/test/CodeGen/WebAssembly/multivalue-dont-move-def-past-use.mir
@@ -1,5 +1,5 @@
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
-# RUN: llc -mtriple=wasm32-unknown-unknown -mattr=+multivalue -run-pass=wasm-reg-stackify -verify-machineinstrs %s -o - | FileCheck %s
+# RUN: llc -mtriple=wasm32-unknown-unknown -mattr=+multivalue -target-abi=experimental-mv -run-pass=wasm-reg-stackify -verify-machineinstrs %s -o - | FileCheck %s
--- |
target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
diff --git a/llvm/test/CodeGen/WebAssembly/multivalue-stackify.ll b/llvm/test/CodeGen/WebAssembly/multivalue-stackify.ll
index 52a8c686824d33..0b5a304589aa6c 100644
--- a/llvm/test/CodeGen/WebAssembly/multivalue-stackify.ll
+++ b/llvm/test/CodeGen/WebAssembly/multivalue-stackify.ll
@@ -1,7 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; NOTE: Test functions have been generated by multivalue-stackify.py.
-; RUN: llc < %s -verify-machineinstrs -mattr=+multivalue | FileCheck %s
+; RUN: llc < %s -verify-machineinstrs -mattr=+multivalue -target-abi=experimental-mv | FileCheck %s
; Test that the multivalue stackification works
diff --git a/llvm/test/CodeGen/WebAssembly/multivalue.ll b/llvm/test/CodeGen/WebAssembly/multivalue.ll
index 675009c8f3e548..5001db7e57a1e0 100644
--- a/llvm/test/CodeGen/WebAssembly/multivalue.ll
+++ b/llvm/test/CodeGen/WebAssembly/multivalue.ll
@@ -1,7 +1,8 @@
-; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -mcpu=mvp -mattr=+multivalue,+tail-call | FileCheck %s
-; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -mcpu=mvp -mattr=+reference-types,+multivalue,+tail-call | FileCheck --check-prefix REF %s
-; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -mcpu=mvp -mattr=+multivalue,+tail-call | FileCheck %s --check-prefix REGS
-; RUN: llc < %s --filetype=obj -mcpu=mvp -mattr=+multivalue,+tail-call | obj2yaml | FileCheck %s --check-prefix OBJ
+; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -mcpu=mvp -mattr=+multivalue,+tail-call -target-abi=experimental-mv | FileCheck %s
+; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -mcpu=mvp -mattr=+reference-types,+multivalue,+tail-call -target-abi=experimental-mv | FileCheck --check-prefix REF %s
+; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -mcpu=mvp -mattr=+multivalue,+tail-call -target-abi=experimental-mv | FileCheck %s --check-prefix REGS
+; RUN: llc < %s --filetype=obj -mcpu=mvp -mattr=+multivalue,+tail-call -target-abi=experimental-mv | obj2yaml | FileCheck %s --check-prefix OBJ
+; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -mcpu=mvp -mattr=+multivalue,+tail-call | FileCheck %s --check-prefix NO-MULTIVALUE
; Test that the multivalue calls, returns, function types, and block
; types work as expected.
@@ -19,6 +20,7 @@ declare void @use_i64(i64)
; CHECK-NEXT: i32.const 42{{$}}
; CHECK-NEXT: i64.const 42{{$}}
; CHECK-NEXT: end_function{{$}}
+; NO-MULTIVALUE-NOT: .functype pair_const () -> (i32, i64)
define %pair @pair_const() {
ret %pair { i32 42, i64 42 }
}
diff --git a/llvm/test/CodeGen/WebAssembly/multivalue_libcall.ll b/llvm/test/CodeGen/WebAssembly/multivalue_libcall.ll
index 47c5ae7b457dde..2958b115df9d3e 100644
--- a/llvm/test/CodeGen/WebAssembly/multivalue_libcall.ll
+++ b/llvm/test/CodeGen/WebAssembly/multivalue_libcall.ll
@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
-; RUN: llc < %s -verify-machineinstrs -mcpu=mvp -mattr=+multivalue | FileCheck %s --check-prefix=MULTIVALUE
+; RUN: llc < %s -verify-machineinstrs -mcpu=mvp -mattr=+multivalue -target-abi=experimental-mv | FileCheck %s --check-prefix=MULTIVALUE
; RUN: llc < %s -verify-machineinstrs -mcpu=mvp | FileCheck %s --check-prefix=NO_MULTIVALUE
; Test libcall signatures when multivalue is enabled and disabled
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