[LLVM][AArch64][Assembly]: Add FAMINMAX assembly/disasse… (llvm#70115)

…mbly.

This patch adds the feature flag FAMINMAX and the assembly/disassembly
for the following instructions of NEON, SVE2 and SME2:
* NEON:
  - FAMIN
  - FAMAX
* SVE2:
  - FAMIN_ZPmZ
  - FAMAX_ZPmZ
* SME2:
  - FAMAX_2Z2Z
  - FAMIN_2Z2Z
  - FAMAX_4Z4Z
  - FAMIN_4Z4Z

That is according to this documentation:
https://developer.arm.com/documentation/ddi0602/2023-09

Co-authored-by: Caroline Concatto <caroline.concatto@arm.com>

llvm/include/llvm/TargetParser/AArch64TargetParser.h

@@ -161,6 +161,7 @@ enum ArchExtKind : unsigned {
   AEK_GCS =           57, // FEAT_GCS
   AEK_FPMR =          58, // FEAT_FPMR
   AEK_FP8 =           59, // FEAT_FP8
+  AEK_FAMINMAX =      60, // FEAT_FAMINMAX
   AEK_NUM_EXTENSIONS
 };
 using ExtensionBitset = Bitset<AEK_NUM_EXTENSIONS>;
@@ -271,6 +272,7 @@ inline constexpr ExtensionInfo Extensions[] = {
     {"gcs", AArch64::AEK_GCS, "+gcs", "-gcs", FEAT_INIT, "", 0},
     {"fpmr", AArch64::AEK_FPMR, "+fpmr", "-fpmr", FEAT_INIT, "", 0},
     {"fp8", AArch64::AEK_FP8, "+fp8", "-fp8", FEAT_INIT, "+fpmr", 0},
+    {"faminmax", AArch64::AEK_FAMINMAX, "+faminmax", "-faminmax", FEAT_INIT, "", 0},
     // Special cases
     {"none", AArch64::AEK_NONE, {}, {}, FEAT_INIT, "", ExtensionInfo::MaxFMVPriority},
 };

llvm/lib/Target/AArch64/AArch64.td

@@ -514,6 +514,9 @@ def FeatureSME2 : SubtargetFeature<"sme2", "HasSME2", "true",
 def FeatureSME2p1 : SubtargetFeature<"sme2p1", "HasSME2p1", "true",
   "Enable Scalable Matrix Extension 2.1 (FEAT_SME2p1) instructions", [FeatureSME2]>;
 
+def FeatureFAMINMAX: SubtargetFeature<"faminmax", "HasFAMINMAX", "true",
+   "Enable FAMIN and FAMAX instructions (FEAT_FAMINMAX)">;
+
 def FeatureAppleA7SysReg  : SubtargetFeature<"apple-a7-sysreg", "HasAppleA7SysReg", "true",
   "Apple A7 (the CPU formerly known as Cyclone)">;
 

llvm/lib/Target/AArch64/AArch64InstrInfo.td

@@ -164,6 +164,8 @@ def HasFPMR          : Predicate<"Subtarget->hasFPMR()">,
                                  AssemblerPredicateWithAll<(all_of FeatureFPMR), "fpmr">;
 def HasFP8           : Predicate<"Subtarget->hasFP8()">,
                                  AssemblerPredicateWithAll<(all_of FeatureFP8), "fp8">;
+def HasFAMINMAX      : Predicate<"Subtarget->hasFAMINMAX()">,
+                                 AssemblerPredicateWithAll<(all_of FeatureFAMINMAX), "faminmax">;
 
 // A subset of SVE(2) instructions are legal in Streaming SVE execution mode,
 // they should be enabled if either has been specified.
@@ -9265,6 +9267,12 @@ let Predicates = [HasFP8] in {
   defm FSCALE : SIMDThreeSameVectorFP<0b1, 0b1, 0b111, "fscale", null_frag>;
 } // End let Predicates = [HasFP8]
 
+let Predicates = [HasFAMINMAX] in {
+ defm FAMAX : SIMDThreeSameVectorFP<0b0, 0b1, 0b011, "famax", null_frag>;
+ defm FAMIN : SIMDThreeSameVectorFP<0b1, 0b1, 0b011, "famin", null_frag>;
+} // End let Predicates = [HasFAMAXMIN]
+
+
 include "AArch64InstrAtomics.td"
 include "AArch64SVEInstrInfo.td"
 include "AArch64SMEInstrInfo.td"

llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td

@@ -878,3 +878,10 @@ defm FSCALE_4Z4Z  : sme2_fp_sve_destructive_vector_vg4_multi<"fscale",  0b001100
 
 } // [HasSME2, HasFP8]
 
+let Predicates = [HasSME2, HasFAMINMAX] in {
+defm FAMAX_2Z2Z : sme2_fp_sve_destructive_vector_vg2_multi<"famax", 0b0010100>;
+defm FAMIN_2Z2Z : sme2_fp_sve_destructive_vector_vg2_multi<"famin", 0b0010101>;
+
+defm FAMAX_4Z4Z : sme2_fp_sve_destructive_vector_vg4_multi<"famax", 0b0010100>;
+defm FAMIN_4Z4Z : sme2_fp_sve_destructive_vector_vg4_multi<"famin", 0b0010101>;
+} //[HasSME2, HasFAMINMAX]

llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td

@@ -4022,4 +4022,10 @@ defm FCVTN_Z2Z_HtoB  : sve2_fp8_down_cvt_single<0b00, "fcvtn", ZZ_h_mul_r>;
 defm FCVTNB_Z2Z_StoB : sve2_fp8_down_cvt_single<0b01, "fcvtnb", ZZ_s_mul_r>;
 defm BFCVTN_Z2Z_HtoB : sve2_fp8_down_cvt_single<0b10, "bfcvtn", ZZ_h_mul_r>;
 defm FCVTNT_Z2Z_StoB : sve2_fp8_down_cvt_single<0b11, "fcvtnt", ZZ_s_mul_r>;
-} // End HasSVE2orSME2, HasFP8
+} // End HasSVE2orSME2, HasFP8
+
+let Predicates = [HasSVE2orSME2, HasFAMINMAX] in {
+// FP8 Arithmetic - Predicated Group
+defm FAMIN_ZPmZ : sve_fp_2op_p_zds<0b1111, "famin", "", null_frag, DestructiveOther>;
+defm FAMAX_ZPmZ : sve_fp_2op_p_zds<0b1110, "famax", "", null_frag, DestructiveOther>;
+} // End HasSVE2orSME2, HasFAMINMAX

llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp

@@ -3640,6 +3640,7 @@ static const struct Extension {
     {"tme", {AArch64::FeatureTME}},
     {"fpmr", {AArch64::FeatureFPMR}},
     {"fp8", {AArch64::FeatureFP8}},
+    {"faminmax", {AArch64::FeatureFAMINMAX}},
 };
 
 static void setRequiredFeatureString(FeatureBitset FBS, std::string &Str) {

llvm/test/MC/AArch64/FP8/directive-arch-negative.s

@@ -5,3 +5,10 @@
 bf1cvtl v0.8h, v0.8b
 // CHECK: error: instruction requires: fp8
 // CHECK: bf1cvtl v0.8h, v0.8b
+
+.arch armv9-a+faminmax
+.arch armv9-a+nofaminmax
+famax  v31.4h, v31.4h, v31.4h
+// CHECK: error: instruction requires: faminmax
+// CHECK: famax  v31.4h, v31.4h, v31.4h
+

llvm/test/MC/AArch64/FP8/directive-arch.s

@@ -5,3 +5,9 @@ bf1cvtl v0.8h, v0.8b
 // CHECK: bf1cvtl v0.8h, v0.8b
 
 .arch armv9-a+nofp8
+.arch armv9-a+faminmax
+famax  v31.4h, v31.4h, v31.4h
+// CHECK: famax  v31.4h, v31.4h, v31.4h
+
+.arch armv9-a+nofaminmax
+

llvm/test/MC/AArch64/FP8/faminmax-diagnostics.s

@@ -0,0 +1,64 @@
+// RUN: not llvm-mc -triple=aarch64 -show-encoding -mattr=+faminmax 2>&1 < %s| FileCheck %s
+
+// --------------------------------------------------------------------------//
+// Element size extension incorrect
+
+famax  v0.16s, v0.4s, v0.4s
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid vector kind qualifier
+// CHECK-NEXT: famax  v0.16s, v0.4s, v0.4s
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famax  v0.4h, v0.4s, v0.4s
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: famax  v0.4h, v0.4s, v0.4s
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famax  v0.8h, v0.8s, v0.8s
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid vector kind qualifier
+// CHECK-NEXT: famax  v0.8h, v0.8s, v0.8s
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famax  v0.2s, v0.2h, v0.2h
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: famax  v0.2s, v0.2h, v0.2h
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famax  v0.4s, v31.4h, v0.4h
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: famax  v0.4s, v31.4h, v0.4h
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famax  v0.2d, v31.2h, v0.2h
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: famax  v0.2d, v31.2h, v0.2h
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famin  v0.16s, v0.4s, v0.4s
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid vector kind qualifier
+// CHECK-NEXT: famin  v0.16s, v0.4s, v0.4s
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famin  v0.4h, v0.4s, v0.4s
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: famin  v0.4h, v0.4s, v0.4s
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famin  v0.8h, v0.8s, v0.8s
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid vector kind qualifier
+// CHECK-NEXT: famin  v0.8h, v0.8s, v0.8s
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famin  v0.2s, v0.2h, v0.2h
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: famin  v0.2s, v0.2h, v0.2h
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famin  v0.4s, v31.4h, v0.4h
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: famin  v0.4s, v31.4h, v0.4h
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+famin  v0.2d, v31.2h, v0.2h
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: famin  v0.2d, v31.2h, v0.2h
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:

llvm/test/MC/AArch64/FP8/faminmax.s

@@ -0,0 +1,197 @@
+// RUN: llvm-mc -triple=aarch64 -show-encoding -mattr=+faminmax < %s \
+// RUN:        | FileCheck %s --check-prefixes=CHECK-ENCODING,CHECK-INST
+// RUN: not llvm-mc -triple=aarch64 -show-encoding < %s 2>&1 \
+// RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
+// RUN: llvm-mc -triple=aarch64 -filetype=obj -mattr=+faminmax < %s \
+// RUN:        | llvm-objdump -d --mattr=+faminmax - | FileCheck %s --check-prefix=CHECK-INST
+// RUN: llvm-mc -triple=aarch64 -filetype=obj -mattr=+faminmax < %s \
+// RUN:        | llvm-objdump -d --mattr=-faminmax - | FileCheck %s --check-prefix=CHECK-UNKNOWN
+// Disassemble encoding and check the re-encoding (-show-encoding) matches.
+// RUN: llvm-mc -triple=aarch64 -show-encoding -mattr=+faminmax < %s \
+// RUN:        | sed '/.text/d' | sed 's/.*encoding: //g' \
+// RUN:        | llvm-mc -triple=aarch64 -mattr=+faminmax -disassemble -show-encoding \
+// RUN:        | FileCheck %s --check-prefixes=CHECK-ENCODING,CHECK-INST
+
+/// FAMAX instructions.
+famax  v31.4h, v31.4h, v31.4h
+// CHECK-INST: famax  v31.4h, v31.4h, v31.4h
+// CHECK-ENCODING: [0xff,0x1f,0xdf,0x0e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 0edf1fff  <unknown>
+
+famax  v31.4h, v0.4h, v31.4h
+// CHECK-INST: famax  v31.4h, v0.4h, v31.4h
+// CHECK-ENCODING: [0x1f,0x1c,0xdf,0x0e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 0edf1c1f <unknown>
+
+famax  v0.4h, v0.4h, v0.4h
+// CHECK-INST: famax  v0.4h, v0.4h, v0.4h
+// CHECK-ENCODING: [0x00,0x1c,0xc0,0x0e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 0ec01c00 <unknown>
+
+famax  v31.8h, v31.8h, v31.8h
+// CHECK-INST: famax  v31.8h, v31.8h, v31.8h
+// CHECK-ENCODING: [0xff,0x1f,0xdf,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4edf1fff <unknown>
+
+famax  v31.8h, v31.8h, v0.8h
+// CHECK-INST: famax  v31.8h, v31.8h, v0.8h
+// CHECK-ENCODING: [0xff,0x1f,0xc0,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4ec01fff <unknown>
+
+famax  v0.8h, v0.8h, v0.8h
+// CHECK-INST: famax  v0.8h, v0.8h, v0.8h
+// CHECK-ENCODING: [0x00,0x1c,0xc0,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4ec01c00 <unknown>
+
+famax  v31.2s, v31.2s, v31.2s
+// CHECK-INST: famax  v31.2s, v31.2s, v31.2s
+// CHECK-ENCODING: [0xff,0xdf,0xbf,0x0e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 0ebfdfff <unknown>
+
+famax  v31.2s, v0.2s, v0.2s
+// CHECK-INST: famax  v31.2s, v0.2s, v0.2s
+// CHECK-ENCODING: [0x1f,0xdc,0xa0,0x0e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 0ea0dc1f <unknown>
+
+famax  v0.2s, v0.2s, v0.2s
+// CHECK-INST: famax  v0.2s, v0.2s, v0.2s
+// CHECK-ENCODING: [0x00,0xdc,0xa0,0x0e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 0ea0dc00 <unknown>
+
+famax  v31.4s, v31.4s, v31.4s
+// CHECK-INST: famax  v31.4s, v31.4s, v31.4s
+// CHECK-ENCODING: [0xff,0xdf,0xbf,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4ebfdfff <unknown>
+
+famax  v0.4s, v31.4s, v31.4s
+// CHECK-INST: famax  v0.4s, v31.4s, v31.4s
+// CHECK-ENCODING: [0xe0,0xdf,0xbf,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4ebfdfe0 <unknown>
+
+famax  v0.4s, v0.4s, v0.4s
+// CHECK-INST: famax  v0.4s, v0.4s, v0.4s
+// CHECK-ENCODING: [0x00,0xdc,0xa0,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4ea0dc00 <unknown>
+
+famax  v31.2d, v31.2d, v31.2d
+// CHECK-INST: famax  v31.2d, v31.2d, v31.2d
+// CHECK-ENCODING: [0xff,0xdf,0xff,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4effdfff <unknown>
+
+famax  v0.2d, v0.2d, v31.2d
+// CHECK-INST: famax  v0.2d, v0.2d, v31.2d
+// CHECK-ENCODING: [0x00,0xdc,0xff,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4effdc00 <unknown>
+
+famax  v0.2d, v0.2d, v0.2d
+// CHECK-INST: famax  v0.2d, v0.2d, v0.2d
+// CHECK-ENCODING: [0x00,0xdc,0xe0,0x4e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 4ee0dc00 <unknown>
+
+
+/// FAMIN instructions.
+famin  v31.4h, v31.4h, v31.4h
+// CHECK-INST: famin  v31.4h, v31.4h, v31.4h
+// CHECK-ENCODING: [0xff,0x1f,0xdf,0x2e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 2edf1fff  <unknown>
+
+famin  v31.4h, v0.4h, v31.4h
+// CHECK-INST: famin  v31.4h, v0.4h, v31.4h
+// CHECK-ENCODING: [0x1f,0x1c,0xdf,0x2e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 2edf1c1f <unknown>
+
+famin  v0.4h, v0.4h, v0.4h
+// CHECK-INST: famin  v0.4h, v0.4h, v0.4h
+// CHECK-ENCODING: [0x00,0x1c,0xc0,0x2e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 2ec01c00 <unknown>
+
+famin  v31.8h, v31.8h, v31.8h
+// CHECK-INST: famin  v31.8h, v31.8h, v31.8h
+// CHECK-ENCODING: [0xff,0x1f,0xdf,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6edf1fff <unknown>
+
+famin  v31.8h, v31.8h, v0.8h
+// CHECK-INST: famin  v31.8h, v31.8h, v0.8h
+// CHECK-ENCODING: [0xff,0x1f,0xc0,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6ec01fff <unknown>
+
+famin  v0.8h, v0.8h, v0.8h
+// CHECK-INST: famin  v0.8h, v0.8h, v0.8h
+// CHECK-ENCODING: [0x00,0x1c,0xc0,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6ec01c00 <unknown>
+
+famin  v31.2s, v31.2s, v31.2s
+// CHECK-INST: famin  v31.2s, v31.2s, v31.2s
+// CHECK-ENCODING: [0xff,0xdf,0xbf,0x2e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 2ebfdfff <unknown>
+
+famin  v31.2s, v0.2s, v0.2s
+// CHECK-INST: famin  v31.2s, v0.2s, v0.2s
+// CHECK-ENCODING: [0x1f,0xdc,0xa0,0x2e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 2ea0dc1f <unknown>
+
+famin  v0.2s, v0.2s, v0.2s
+// CHECK-INST: famin  v0.2s, v0.2s, v0.2s
+// CHECK-ENCODING: [0x00,0xdc,0xa0,0x2e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 2ea0dc00 <unknown>
+
+famin  v31.4s, v31.4s, v31.4s
+// CHECK-INST: famin  v31.4s, v31.4s, v31.4s
+// CHECK-ENCODING: [0xff,0xdf,0xbf,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6ebfdfff <unknown>
+
+famin  v0.4s, v31.4s, v31.4s
+// CHECK-INST: famin  v0.4s, v31.4s, v31.4s
+// CHECK-ENCODING: [0xe0,0xdf,0xbf,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6ebfdfe0 <unknown>
+
+famin  v0.4s, v0.4s, v0.4s
+// CHECK-INST: famin  v0.4s, v0.4s, v0.4s
+// CHECK-ENCODING: [0x00,0xdc,0xa0,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6ea0dc00 <unknown>
+
+famin  v31.2d, v31.2d, v31.2d
+// CHECK-INST: famin  v31.2d, v31.2d, v31.2d
+// CHECK-ENCODING: [0xff,0xdf,0xff,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6effdfff <unknown>
+
+famin  v0.2d, v0.2d, v31.2d
+// CHECK-INST: famin  v0.2d, v0.2d, v31.2d
+// CHECK-ENCODING: [0x00,0xdc,0xff,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6effdc00 <unknown>
+
+famin  v0.2d, v0.2d, v0.2d
+// CHECK-INST: famin  v0.2d, v0.2d, v0.2d
+// CHECK-ENCODING: [0x00,0xdc,0xe0,0x6e]
+// CHECK-ERROR: instruction requires: faminmax
+// CHECK-UNKNOWN: 6ee0dc00 <unknown>
+