diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/ARM/ARMAsmPrinter.cpp | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp index 4701cb4488..f688407d69 100644 --- a/lib/Target/ARM/ARMAsmPrinter.cpp +++ b/lib/Target/ARM/ARMAsmPrinter.cpp @@ -719,12 +719,14 @@ void ARMAsmPrinter::emitAttributes() { if (Subtarget->hasMPExtension()) ATS.emitAttribute(ARMBuildAttrs::MPextension_use, ARMBuildAttrs::AllowMP); - if (Subtarget->hasDivide()) { - // Check if hardware divide is only available in thumb2 or ARM as well. - ATS.emitAttribute(ARMBuildAttrs::DIV_use, - Subtarget->hasDivideInARMMode() ? ARMBuildAttrs::AllowDIVExt : - ARMBuildAttrs::AllowDIVIfExists); - } + // Hardware divide in ARM mode is part of base arch, starting from ARMv8. + // If only Thumb hwdiv is present, it must also be in base arch (ARMv7-R/M). + // It is not possible to produce DisallowDIV: if hwdiv is present in the base + // arch, supplying -hwdiv downgrades the effective arch, via ClearImpliedBits. + // AllowDIVExt is only emitted if hwdiv isn't available in the base arch; + // otherwise, the default value (AllowDIVIfExists) applies. + if (Subtarget->hasDivideInARMMode() && !Subtarget->hasV8Ops()) + ATS.emitAttribute(ARMBuildAttrs::DIV_use, ARMBuildAttrs::AllowDIVExt); if (Subtarget->hasTrustZone() && Subtarget->hasVirtualization()) ATS.emitAttribute(ARMBuildAttrs::Virtualization_use, |