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[PowerPC] Only use some extend mne if assembler is modern enough

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Legacy AIX assembly might not support all extended mnes,
add one feature bit to control the generation in MC,
and avoid generating them by default on AIX.

Reviewed By: sfertile

Differential Revision: https://reviews.llvm.org/D94458
This commit is contained in:
Jinsong Ji 2021-01-14 20:35:56 +00:00
parent 59b81ce9c2
commit 1232463119
9 changed files with 62 additions and 6 deletions
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12
lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
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@ -78,7 +78,17 @@ static MCRegisterInfo *createPPCMCRegisterInfo(const Triple &TT) {
static MCSubtargetInfo *createPPCMCSubtargetInfo(const Triple &TT,
StringRef CPU, StringRef FS) {
return createPPCMCSubtargetInfoImpl(TT, CPU, /*TuneCPU*/ CPU, FS);
// Set some default feature to MC layer.
std::string FullFS = std::string(FS);
if (TT.isOSAIX()) {
if (!FullFS.empty())
FullFS = "+aix," + FullFS;
else
FullFS = "+aix";
}
return createPPCMCSubtargetInfoImpl(TT, CPU, /*TuneCPU*/ CPU, FullFS);
}
static MCAsmInfo *createPPCMCAsmInfo(const MCRegisterInfo &MRI,

4
lib/Target/PowerPC/PPC.td
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@ -57,6 +57,10 @@ def DirectivePwrFuture
def Feature64Bit : SubtargetFeature<"64bit","Has64BitSupport", "true",
"Enable 64-bit instructions">;
def AIXOS: SubtargetFeature<"aix", "IsAIX", "true", "AIX OS">;
def FeatureModernAIXAs
: SubtargetFeature<"modern-aix-as", "HasModernAIXAs", "true",
"AIX system assembler is modern enough to support new mnes">;
def FeatureHardFloat : SubtargetFeature<"hard-float", "HasHardFloat", "true",
"Enable floating-point instructions">;
def Feature64BitRegs : SubtargetFeature<"64bitregs","Use64BitRegs", "true",

7
lib/Target/PowerPC/PPCInstr64Bit.td
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@ -987,8 +987,11 @@ def : InstAlias<"cntlzw. $rA, $rS", (CNTLZW8_rec g8rc:$rA, g8rc:$rS)>;
def : InstAlias<"mtxer $Rx", (MTSPR8 1, g8rc:$Rx)>;
def : InstAlias<"mfxer $Rx", (MFSPR8 g8rc:$Rx, 1)>;
def : InstAlias<"mtudscr $Rx", (MTSPR8 3, g8rc:$Rx)>;
def : InstAlias<"mfudscr $Rx", (MFSPR8 g8rc:$Rx, 3)>;
//Disable this alias on AIX for now because as does not support them.
let Predicates = [ModernAs] in {
def : InstAlias<"mtudscr $Rx", (MTSPR8 3, g8rc:$Rx)>;
def : InstAlias<"mfudscr $Rx", (MFSPR8 g8rc:$Rx, 3)>;
}
def : InstAlias<"mfrtcu $Rx", (MFSPR8 g8rc:$Rx, 4)>;
def : InstAlias<"mfrtcl $Rx", (MFSPR8 g8rc:$Rx, 5)>;

7
lib/Target/PowerPC/PPCInstrInfo.td
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@ -1120,6 +1120,10 @@ def HasFPU : Predicate<"Subtarget->hasFPU()">;
def PCRelativeMemops : Predicate<"Subtarget->hasPCRelativeMemops()">;
def IsNotISA3_1 : Predicate<"!Subtarget->isISA3_1()">;
// AIX assembler may not be modern enough to support some extended mne.
def ModernAs: Predicate<"!Subtarget->isAIXABI() || Subtarget->HasModernAIXAs">,
AssemblerPredicate<(any_of (not AIXOS), FeatureModernAIXAs)>;
//===----------------------------------------------------------------------===//
// PowerPC Multiclass Definitions.
@ -4649,8 +4653,11 @@ def : InstAlias<"mtmsr $RS", (MTMSR gprc:$RS, 0)>;
def : InstAlias<"mtxer $Rx", (MTSPR 1, gprc:$Rx)>;
def : InstAlias<"mfxer $Rx", (MFSPR gprc:$Rx, 1)>;
//Disable this alias on AIX for now because as does not support them.
let Predicates = [ModernAs] in {
def : InstAlias<"mtudscr $Rx", (MTSPR 3, gprc:$Rx)>;
def : InstAlias<"mfudscr $Rx", (MFSPR gprc:$Rx, 3)>;
}
def : InstAlias<"mfrtcu $Rx", (MFSPR gprc:$Rx, 4)>;
def : InstAlias<"mfrtcl $Rx", (MFSPR gprc:$Rx, 5)>;

2
lib/Target/PowerPC/PPCSubtarget.cpp
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@ -133,6 +133,8 @@ void PPCSubtarget::initializeEnvironment() {
UsePPCPostRASchedStrategy = false;
PairedVectorMemops = false;
PredictableSelectIsExpensive = false;
HasModernAIXAs = false;
IsAIX = false;
HasPOPCNTD = POPCNTD_Unavailable;
}

2
lib/Target/PowerPC/PPCSubtarget.h
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@ -153,6 +153,8 @@ protected:
bool UsePPCPostRASchedStrategy;
bool PairedVectorMemops;
bool PredictableSelectIsExpensive;
bool HasModernAIXAs;
bool IsAIX;
POPCNTDKind HasPOPCNTD;

7
lib/Target/PowerPC/PPCTargetMachine.cpp
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@ -190,6 +190,13 @@ static std::string computeFSAdditions(StringRef FS, CodeGenOpt::Level OL,
FullFS = "+invariant-function-descriptors";
}
if (TT.isOSAIX()) {
if (!FullFS.empty())
FullFS = "+aix," + FullFS;
else
FullFS = "+aix";
}
return FullFS;
}

11
test/MC/Disassembler/PowerPC/ppc64-encoding-ext.txt
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@ -1,4 +1,7 @@
# RUN: llvm-mc --disassemble %s -triple powerpc64-unknown-unknown -mcpu=pwr7 | FileCheck %s
# RUN: llvm-mc --disassemble %s -triple powerpc64-unknown-unknown -mcpu=pwr7 | FileCheck %s --check-prefixes=CHECK,MODERN
# RUN: llvm-mc --disassemble %s -triple powerpc64-unknown-linux-gnu -mcpu=pwr7 | FileCheck %s --check-prefixes=CHECK,MODERN
# RUN: llvm-mc --disassemble %s -triple powerpc64-ibm-aix-xcoff -mcpu=pwr7 | FileCheck %s --check-prefixes=CHECK,OLD
# RUN: llvm-mc --disassemble %s -triple powerpc64-ibm-aix-xcoff -mattr=+modern-aix-as -mcpu=pwr7 | FileCheck %s --check-prefixes=CHECK,MODERN
# FIXME: decode as beqlr 0
# CHECK: bclr 12, 2
@ -2212,10 +2215,12 @@
# CHECK: mfxer 2
0x7c 0x41 0x02 0xa6
# CHECK: mtudscr 2
# MODERN: mtudscr 2
# OLD: mtspr 3, 2
0x7c 0x43 0x03 0xa6
# CHECK: mfudscr 2
# MODERN: mfudscr 2
# OLD: mfspr 2, 3
0x7c 0x43 0x02 0xa6
# CHECK: mtlr 2

16
test/MC/PowerPC/modern-aix-as.s Normal file
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@ -0,0 +1,16 @@
# RUN: llvm-mc -triple powerpc64-unknown-unknown -mattr=+modern-aix-as --show-encoding %s | FileCheck -check-prefix=CHECK-BE %s
# RUN: llvm-mc -triple powerpc64le-unknown-unknown -mattr=+modern-aix-as --show-encoding %s | FileCheck -check-prefix=CHECK-LE %s
# RUN: llvm-mc -triple powerpc64le-unknown-unknown -mattr=-modern-aix-as --show-encoding %s | FileCheck -check-prefix=CHECK-LE %s
# RUN: not llvm-mc -triple powerpc64le-unknown-unknown -mattr=+aix --show-encoding %s 2>&1 | FileCheck -check-prefix=CHECK-OLD %s
##TODO: Replace above with following when implement createXCOFFAsmParser
# UN: llvm-mc -triple powerpc-aix-ibm-xcoff -mattr=+modern-aix-as --show-encoding %s 2>&1 | FileCheck -check-prefix=CHECK-BE %s
# UN: not llvm-mc -triple powerpc-aix-ibm-xcoff --show-encoding %s 2>&1 | FileCheck -check-prefix=CHECK-OLD %s
# CHECK-BE: mtudscr 2 # encoding: [0x7c,0x43,0x03,0xa6]
# CHECK-LE: mtudscr 2 # encoding: [0xa6,0x03,0x43,0x7c]
# CHECK-OLD: instruction use requires an option to be enabled
mtudscr 2
# CHECK-BE: mfudscr 2 # encoding: [0x7c,0x43,0x02,0xa6]
# CHECK-LE: mfudscr 2 # encoding: [0xa6,0x02,0x43,0x7c]
mfudscr 2