[RISCV] Use computeTargetABI from llc as well as clang

[khchen]

Summary

Clang computes the default ABI if -mabi is empty
and encode it in LLVM IR module flag since D105555.
For correctness, llc need to give the same target-abi
(Options.MCOptions.ABIName) with ABI encoded in IR.
The getSubtargetImpl already has a check for them only if
Options.MCOptions.ABIName is not empty.

In order to get more robustness we could have a check for
explicit ABI, but now we have two different logic to
compute the default ABI.

The front-end ABI is defautl to the ilp32/ilp32e/lp64, and
ilp32d/lp64d when hardware support for extension D.
The backend ABI is default to the ilp32/ilp32e/lp64.

Due to the default target-abi for llc had changed, I update
some tests by specific the target-abi with old default value
to make the expected result unchanged.

[jrtc27]

I think this is the same idea as D118333? Other than being a cleaner way of achieving the same goal. I've not looked to see if there are any functional differences between the two.

[jrtc27]

Uh D113959 even

[khchen]

In D118333#3275940, @jrtc27 wrote:

I think this is the same idea as D118333? Other than being a cleaner way of achieving the same goal. I've not looked to see if there are any functional differences between the two.

The goal of this patch is making llvm and clang have same way to get default target-abi.

D113959 only changes the llvm part and it still not same with clang.

[khchen]

This comment was removed by khchen.

[khchen]

rebase on D119250 to make changes clear.

Thanks for kito's suggestion!

[asb]

Thanks, I've put this on the agenda for the RISC-V LLVM sync call today. I think this is more attractive than the previous proposal due to unifying logic between llc and Clang. I could see a counter-argument about llc being a low-level tool that should be controlled very explicitly.

[jrtc27]

llvm/test/CodeGen/RISCV/double-mem.ll

2 ↗

(On Diff #406842)

For a bunch of these it seems it'd make more sense to just use a hard-float ABI. I think it's worthwhile keeping this as NFC test-wise, but don't know if it makes sense to update the ABIs first and make this patch smaller or land this then go through at a later date so as to not stall this patch.

[asb]

In D118333#3329422, @asb wrote:

Thanks, I've put this on the agenda for the RISC-V LLVM sync call today. I think this is more attractive than the previous proposal due to unifying logic between llc and Clang. I could see a counter-argument about llc being a low-level tool that should be controlled very explicitly.

I forgot to update on this. Nobody had particularly strong feelings either way, but I think the overall consensus was that this change seemed sensible. Landing this after the LLVM 14 branch also feels like a good time for it. LGTM - thanks.

llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp

if (!ABIName.empty() && TargetABI == ABI_Unknown) {
     errs()
         << "Only the ilp32e ABI is supported for RV32E (ignoring target-abi)\n";
     TargetABI = ABI_Unknown;
   }
 
   if (TargetABI != ABI_Unknown)
     return TargetABI;
 
-  // For now, default to the ilp32/ilp32e/lp64 ABI if no explicit ABI is given
-  // or an invalid/unrecognised string is given. In the future, it might be
-  // worth changing this to default to ilp32f/lp64f and ilp32d/lp64d when
-  // hardware support for floating point is present.
-  if (IsRV32E)
-    return ABI_ILP32E;
-  if (IsRV64)
-    return ABI_LP64;
-  return ABI_ILP32;
+  // If no explicit ABI is given, try to compute the default ABI.
+  auto ISAInfo = RISCVFeatures::parseFeatureBits(IsRV64, FeatureBits);
+  if (!ISAInfo)
+    report_fatal_error(ISAInfo.takeError());
+  return getTargetABI((*ISAInfo)->computeDefaultABI());
 }
 
 ABI getTargetABI(StringRef ABIName) {
   auto TargetABI = StringSwitch<ABI>(ABIName)
                        .Case("ilp32", ABI_ILP32)
                        .Case("ilp32f", ABI_ILP32F)
                        .Case("ilp32d", ABI_ILP32D)
                        .Case("ilp32e", ABI_ILP32E)

llvm/test/CodeGen/RISCV/callee-saved-fpr64s.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=ILP32
-; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs< %s \
 ; RUN:   | FileCheck %s -check-prefix=LP64
 ; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi ilp32d -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=ILP32D
 ; RUN: llc -mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=LP64D
 
 @var = global [32 x double] zeroinitializer
 

llvm/test/CodeGen/RISCV/double-bitmanip-dagcombines.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -target-abi=ilp32 -mattr=+d -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IFD %s
-; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
-; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -target-abi=lp64 -mattr=+d -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64IFD %s
 ;
 ; This file tests cases where simple floating point operations can be
 ; profitably handled though bit manipulation if a soft-float ABI is being used
 ; (e.g. fneg implemented by XORing the sign bit). This is typically handled in
 ; DAGCombiner::visitBITCAST, but this target-independent code may not trigger
 ; in cases where we perform custom legalisation (e.g. RV32IFD).
 

llvm/test/CodeGen/RISCV/double-calling-conv.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IFD %s
 
 ; Basic correctness checks for calling convention lowering for RV32D. This can
 ; be somewhat error-prone for soft-float RV32D due to the fact that f64 is legal
 ; but i64 is not, and there is no instruction to move values directly between
 ; the GPRs and 64-bit FPRs.
 
 define double @callee_double_inreg(double %a, double %b) nounwind {

llvm/test/CodeGen/RISCV/double-previous-failure.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IFD %s
 
 define double @test(double %a) nounwind {
 ; RV32IFD-LABEL: test:
 ; RV32IFD:       # %bb.0:
 ; RV32IFD-NEXT:    ret
   ret double %a
 }

llvm/test/CodeGen/RISCV/double-stack-spill-restore.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IFD %s
-; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64IFD %s
 
 define double @func(double %d, i32 %n) nounwind {
 ; RV32IFD-LABEL: func:
 ; RV32IFD:       # %bb.0: # %entry
 ; RV32IFD-NEXT:    addi sp, sp, -32
 ; RV32IFD-NEXT:    sw ra, 28(sp) # 4-byte Folded Spill
 ; RV32IFD-NEXT:    sw a0, 16(sp)

llvm/test/CodeGen/RISCV/fastcc-float.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+f,+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+f,+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:     | FileCheck %s
 
 define fastcc float @callee(<32 x float> %A) nounwind {
 ; CHECK-LABEL: callee:
 ; CHECK:       # %bb.0:
 ; CHECK-NEXT:    fmv.x.w a0, fa0
 ; CHECK-NEXT:    ret
   %B = extractelement <32 x float> %A, i32 0

llvm/test/CodeGen/RISCV/float-bit-preserving-dagcombines.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+f -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32F %s
-; RUN: llc -mtriple=riscv32 -mattr=+f,+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+f,+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32FD %s
-; RUN: llc -mtriple=riscv64 -mattr=+f -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+f -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64F %s
-; RUN: llc -mtriple=riscv64 -mattr=+f,+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+f,+d -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64FD %s
 
 ; These functions perform extra work to ensure that `%a3` starts in a
 ; floating-point register, if the machine has them, and the result of
 ; the bitwise operation is then needed in a floating-point register.
 ; This should mean the optimisations will fire even if you're using the
 ; soft-float ABI on a machine with hardware floating-point support.
 

llvm/test/CodeGen/RISCV/inline-asm-clobbers.ll

-; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
-; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
-; RUN: llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+f -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
-; RUN: llc -mtriple=riscv64 -mattr=+f -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+f -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
-; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
 ; RUN: llc -mtriple=riscv32 -mattr=+f -target-abi ilp32f -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IF %s
 ; RUN: llc -mtriple=riscv64 -mattr=+f -target-abi lp64f -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64IF %s
 ; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi ilp32d -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32ID %s
 ; RUN: llc -mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs < %s \

llvm/test/CodeGen/RISCV/inline-asm-d-constraint-f.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32F %s
-; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64F %s
 
 @gd = external global double
 
 define double @constraint_f_double(double %a) nounwind {
 ; RV32F-LABEL: constraint_f_double:
 ; RV32F:       # %bb.0:
 ; RV32F-NEXT:    addi sp, sp, -16

llvm/test/CodeGen/RISCV/inline-asm-f-constraint-f.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs < %s \
+; NOTE: Assertions gave been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 -mattr=+f -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32F %s
-; RUN: llc -mtriple=riscv64 -mattr=+f -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+f -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64F %s
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32F %s
-; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64F %s
 
 @gf = external global float
 
 define float @constraint_f_float(float %a) nounwind {
 ; RV32F-LABEL: constraint_f_float:
 ; RV32F:       # %bb.0:
 ; RV32F-NEXT:    lui a1, %hi(gf)

llvm/test/CodeGen/RISCV/mattr-invalid-combination.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: not --crash llc -mtriple=riscv64 -mattr=+e < %s 2>&1 \
 ; RUN:   | FileCheck -check-prefix=RV64E %s
 
-; RV64E: LLVM ERROR: RV32E can't be enabled for an RV64 target
+; RV64E: LLVM ERROR: standard user-level extension 'e' requires 'rv32'

llvm/test/CodeGen/RISCV/rvv/fixed-vectors-emergency-slot.mir

 # NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-# RUN: llc -mtriple riscv64 -mattr=+v -start-before=prologepilog -o - \
+# NOTE: Assertions gave been autogenerated by utils/update_llc_test_checks.py
+# RUN: llc -mtriple riscv64 -mattr=+v -target-abi=lp64 -start-before=prologepilog -o - \
 # RUN:     -verify-machineinstrs %s | FileCheck %s
 --- |
   target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
   target triple = "riscv64"
 
   define weak_odr dso_local void @fixedlen_vector_spillslot(i8* %ay) nounwind {
   ; CHECK-LABEL: fixedlen_vector_spillslot:
   ; CHECK:       # %bb.0: # %entry

llvm/test/CodeGen/RISCV/rvv/large-rvv-stack-size.mir

 # NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-# RUN: llc -mtriple riscv64 -mattr=+m,+v -start-before=prologepilog -o - \
+# RUN: llc -mtriple riscv64 -mattr=+m,+v -target-abi=lp64 -start-before=prologepilog -o - \
 # RUN:     -verify-machineinstrs %s | FileCheck %s
 --- |
   target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
   target triple = "riscv64"
 
   define void @spillslot() {
   ; CHECK-LABEL: spillslot:
   ; CHECK:       # %bb.0:

llvm/test/CodeGen/RISCV/select-const.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
-; RUN: llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+f -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IF %s
-; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbt -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbt -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IBT %s
-; RUN: llc -mtriple=riscv32 -mattr=+f,+experimental-zbt -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+f,+experimental-zbt -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IFBT %s
-; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
-; RUN: llc -mtriple=riscv64 -mattr=+f,+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+f,+d -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64IFD %s
-; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbt -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbt -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64IBT %s
-; RUN: llc -mtriple=riscv64 -mattr=+f,+d,+experimental-zbt -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+f,+d,+experimental-zbt -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64IFDBT %s
 
 ;; This tests how good we are at materialising constants using `select`. The aim
 ;; is that we do so without a branch if possible (at the moment our lowering of
 ;; select always introduces a branch).
 ;;
 ;; Currently the hook `convertSelectOfConstantsToMath` only is useful when the
 ;; constants are either 1 away from each other, or one is a power of two and

llvm/test/CodeGen/RISCV/select-optimize-multiple.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
-; RUN: llc -mtriple=riscv32 -mattr=+d,+experimental-zbt -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+d,+experimental-zbt -target-abi=ilp32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32IBT
-; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV64I
-; RUN: llc -mtriple=riscv64 -mattr=+d,+experimental-zbt -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+d,+experimental-zbt -target-abi=lp64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV64IBT
 
 ; Selects of wide values are split into two selects, which can easily cause
 ; unnecessary control flow. Here we check some cases where we can currently
 ; emit a sequence of selects with shared control flow.
 
 define i64 @cmovcc64(i32 signext %a, i64 %b, i64 %c) nounwind {
 ; RV32I-LABEL: cmovcc64:

llvm/test/CodeGen/RISCV/spill-fpr-scalar.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv64 -mattr=+v,+d,+zfh \
+; RUN: llc -mtriple=riscv64 -mattr=+v,+d,+zfh -target-abi=lp64 \
 ; RUN:   -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s
 
 declare half @llvm.riscv.vfmv.f.s.nxv1f16(<vscale x 1 x half>)
 declare float @llvm.riscv.vfmv.f.s.nxv1f32(<vscale x 1 x float>)
 declare double @llvm.riscv.vfmv.f.s.nxv1f64(<vscale x 1 x double>)
 
 declare <vscale x 1 x half> @llvm.riscv.vfmv.v.f.nxv1f16(<vscale x 1 x half>, half, i64);

llvm/test/MC/RISCV/mattr-invalid-combination.s

 # RUN: not --crash llvm-mc -triple riscv64 -mattr=+e < %s 2>&1 \
 # RUN:   | FileCheck %s -check-prefix=RV64E
 
-# RV64E: LLVM ERROR: RV32E can't be enabled for an RV64 target
+# RV64E: LLVM ERROR: standard user-level extension 'e' requires 'rv32'