================
@@ -659,13 +659,21 @@ llvm::ARM::FPUKind arm::getARMTargetFeatures(const Driver
&D,
CPUArgFPUKind != llvm::ARM::FK_INVALID ? CPUArgFPUKind :
ArchArgFPUKind;
(void)llvm::ARM::getFPUFeatures(FPUKind, Features);
} else {
+ bool Generic = true;
if (!ForAS) {
std::string CPU = arm::getARMTargetCPU(CPUName, ArchName, Triple);
+ if (CPU != "generic")
+ Generic = false;
llvm::ARM::ArchKind ArchKind =
arm::getLLVMArchKindForARM(CPU, ArchName, Triple);
FPUKind = llvm::ARM::getDefaultFPU(CPU, ArchKind);
(void)llvm::ARM::getFPUFeatures(FPUKind, Features);
}
+ if (Generic && (Triple.isOSWindows() || Triple.isOSDarwin()) &&
----------------
mstorsjo wrote:
> If you were to split out the ForAS change, would that be targeted enough to
> fix @anemet 's issue, or would that backport be just as impactful as
> https://github.com/llvm/llvm-project/pull/134366 ?
That PR is exactly the split out form of the targeted fix for @anemet's issue -
but it does change whether FPU features are available in the assembler overall,
so it is a bit of a potentially breaking change.
I did experiment with an even smaller change, something along these lines
```diff
diff --git a/clang/lib/Driver/ToolChains/Arch/ARM.cpp
b/clang/lib/Driver/ToolChains/Arch/ARM.cpp
index c648fb66085c..5b1721583d05 100644
--- a/clang/lib/Driver/ToolChains/Arch/ARM.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/ARM.cpp
@@ -659,11 +659,9 @@ llvm::ARM::FPUKind arm::getARMTargetFeatures(const Driver
&D,
CPUArgFPUKind != llvm::ARM::FK_INVALID ? CPUArgFPUKind :
ArchArgFPUKind;
(void)llvm::ARM::getFPUFeatures(FPUKind, Features);
} else {
- bool Generic = true;
+ std::string CPU = arm::getARMTargetCPU(CPUName, ArchName, Triple);
+ bool Generic = "generic";
if (!ForAS) {
- std::string CPU = arm::getARMTargetCPU(CPUName, ArchName, Triple);
- if (CPU != "generic")
- Generic = false;
llvm::ARM::ArchKind ArchKind =
arm::getLLVMArchKindForARM(CPU, ArchName, Triple);
FPUKind = llvm::ARM::getDefaultFPU(CPU, ArchKind);
```
Unfortunately, this does break a bunch of the cases that this PR did attempt to
fix. Things work fine as is in upstream llvm, but with the downstream Debian
patch from
https://salsa.debian.org/pkg-llvm-team/llvm-toolchain/-/blob/19/debian/patches/clang-arm-default-vfp3-on-armv7a.patch?ref_type=heads,
things would still break again on Windows (and for armv7s+Darwin). This
because Windows on ARM gets a default CPU of `cortex-a9` (not `generic`, and
armv7s+Darwin gets `swift`), so we don't add the explicit NEON that we wanted.
https://github.com/llvm/llvm-project/pull/122095
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