--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -1047,6 +1047,7 @@ static const arch_entry cpu_arch[] =
   SUBARCH (lwp, LWP, ANY_LWP, false),
   SUBARCH (movbe, MOVBE, MOVBE, false),
   SUBARCH (cx16, CX16, CX16, false),
+  SUBARCH (lahf_sahf, LAHF_SAHF, LAHF_SAHF, false),
   SUBARCH (ept, EPT, ANY_EPT, false),
   SUBARCH (lzcnt, LZCNT, LZCNT, false),
   SUBARCH (popcnt, POPCNT, POPCNT, false),
--- a/gas/doc/c-i386.texi
+++ b/gas/doc/c-i386.texi
@@ -151,6 +151,7 @@ accept various extension mnemonics.  For
 @code{sse4},
 @code{avx},
 @code{avx2},
+@code{lahf_sahf},
 @code{adx},
 @code{rdseed},
 @code{prfchw},
@@ -1487,7 +1488,7 @@ supported on the CPU specified.  The cho
 @item @samp{.rdrnd} @tab @samp{.f16c} @tab @samp{.avx2} @tab @samp{.bmi2}
 @item @samp{.lzcnt} @tab @samp{.popcnt} @tab @samp{.invpcid} @tab @samp{.vmfunc}
 @item @samp{.hle} @tab @samp{.rtm} @tab @samp{.tsx}
-@item @samp{.adx} @tab @samp{.rdseed} @tab @samp{.prfchw}
+@item @samp{.lahf_sahf} @tab @samp{.adx} @tab @samp{.rdseed} @tab @samp{.prfchw}
 @item @samp{.smap} @tab @samp{.mpx} @tab @samp{.sha} @tab @samp{.prefetchwt1}
 @item @samp{.clflushopt} @tab @samp{.xsavec} @tab @samp{.xsaves} @tab @samp{.se1}
 @item @samp{.avx512f} @tab @samp{.avx512cd} @tab @samp{.avx512er} @tab @samp{.avx512pf}
--- a/gas/testsuite/gas/i386/i386.exp
+++ b/gas/testsuite/gas/i386/i386.exp
@@ -934,6 +934,7 @@ if [gas_64_check] then {
     run_dump_test "x86-64-arch-2-btver2"
     run_list_test "x86-64-arch-2-1" "-march=generic64 -I${srcdir}/$subdir -al"
     run_list_test "x86-64-arch-2-2" "-march=generic64+cx16 -I${srcdir}/$subdir -al"
+    run_list_test "x86-64-arch-2-3" "-march=generic64+lahf_sahf -I${srcdir}/$subdir -aln"
     run_dump_test "xmmhi64"
     run_dump_test "x86-64-xsave"
     run_dump_test "x86-64-xsave-intel"
--- a/gas/testsuite/gas/i386/ilp32/x86-64-arch-2.d
+++ b/gas/testsuite/gas/i386/ilp32/x86-64-arch-2.d
@@ -1,5 +1,5 @@
 #source: ../x86-64-arch-2.s
-#as: -march=generic64+avx+vmx+smx+xsave+xsaveopt+aes+pclmul+fma+movbe+cx16+ept+clflush+syscall+rdtscp+3dnowa+sse4a+svme+abm+padlock+bmi+tbm
+#as: -march=generic64+avx+vmx+smx+xsave+xsaveopt+aes+pclmul+fma+movbe+cx16+lahf_sahf+ept+clflush+syscall+rdtscp+3dnowa+sse4a+svme+abm+padlock+bmi+tbm
 #objdump: -dw
 #name: x86-64 (ILP32) arch 2
 #dump: ../x86-64-arch-2.d
--- a/gas/testsuite/gas/i386/x86-64-arch-2.d
+++ b/gas/testsuite/gas/i386/x86-64-arch-2.d
@@ -1,4 +1,4 @@
-#as: -march=generic64+avx+vmx+smx+xsave+xsaveopt+aes+pclmul+fma+movbe+cx16+ept+clflush+syscall+rdtscp+3dnowa+sse4a+svme+abm+padlock+bmi+tbm
+#as: -march=generic64+avx+vmx+smx+xsave+xsaveopt+aes+pclmul+fma+movbe+cx16+lahf_sahf+ept+clflush+syscall+rdtscp+3dnowa+sse4a+svme+abm+padlock+bmi+tbm
 #objdump: -dw
 #name: x86-64 arch 2
 
@@ -38,4 +38,5 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	0f a7 c0             	xstore-rng
 [ 	]*[a-f0-9]+:	c4 e2 60 f3 c9       	blsr   %ecx,%ebx
 [ 	]*[a-f0-9]+:	8f e9 60 01 c9       	blcfill %ecx,%ebx
+[ 	]*[a-f0-9]+:	9f                   	lahf
 #pass
--- a/gas/testsuite/gas/i386/x86-64-arch-2.s
+++ b/gas/testsuite/gas/i386/x86-64-arch-2.s
@@ -62,3 +62,5 @@ xstorerng
 blsr %ecx,%ebx
 # TBM
 blcfill %ecx,%ebx
+# LAHF/SAHF
+lahf
--- a/gas/testsuite/gas/i386/x86-64-arch-2-1.l
+++ b/gas/testsuite/gas/i386/x86-64-arch-2-1.l
@@ -24,6 +24,7 @@
 .*:60: Error: .*
 .*:62: Error: .*
 .*:64: Error: .*
+.*:66: Error: .*
 GAS LISTING .*
 
 
@@ -95,3 +96,5 @@ GAS LISTING .*
 [ 	]*62[ 	]+blsr %ecx,%ebx
 [ 	]*63[ 	]+\# TBM
 [ 	]*64[ 	]+blcfill %ecx,%ebx
+[ 	]*65[ 	]+\# LAHF/SAHF
+[ 	]*66[ 	]+lahf
--- a/gas/testsuite/gas/i386/x86-64-arch-2-2.l
+++ b/gas/testsuite/gas/i386/x86-64-arch-2-2.l
@@ -23,6 +23,7 @@
 .*:60: Error: .*
 .*:62: Error: .*
 .*:64: Error: .*
+.*:66: Error: .*
 GAS LISTING .*
 
 
@@ -94,3 +95,5 @@ GAS LISTING .*
 [ 	]*62[ 	]+blsr %ecx,%ebx
 [ 	]*63[ 	]+\# TBM
 [ 	]*64[ 	]+blcfill %ecx,%ebx
+[ 	]*65[ 	]+\# LAHF/SAHF
+[ 	]*66[ 	]+lahf
--- /dev/null
+++ b/gas/testsuite/gas/i386/x86-64-arch-2-3.l
@@ -0,0 +1,93 @@
+.*: Assembler messages:
+.*:16: Error: .*
+.*:18: Error: .*
+.*:20: Error: .*
+.*:22: Error: .*
+.*:24: Error: .*
+.*:26: Error: .*
+.*:28: Error: .*
+.*:30: Error: .*
+.*:32: Error: .*
+.*:34: Error: .*
+.*:36: Error: .*
+.*:38: Error: .*
+.*:40: Error: .*
+.*:42: Error: .*
+.*:44: Error: .*
+.*:46: Error: .*
+.*:48: Error: .*
+.*:50: Error: .*
+.*:52: Error: .*
+.*:54: Error: .*
+.*:56: Error: .*
+.*:58: Error: .*
+.*:60: Error: .*
+.*:62: Error: .*
+.*:64: Error: .*
+[ 	]*1[ 	]+\.include "x86-64-arch-2\.s"
+[ 	]*1[ 	]+\# Test -march=
+[ 	]*2[ 	]+\.text
+[ 	]*3[ 	]+\# cmov feature *
+[ 	]*4[ 	]+\?\?\?\? 0F44D8   	cmove	%eax,%ebx
+[ 	]*5[ 	]+\# clflush
+[ 	]*6[ 	]+\?\?\?\? 0FAE38   	clflush \(%rax\)
+[ 	]*7[ 	]+\# SYSCALL
+[ 	]*8[ 	]+\?\?\?\? 0F05     	syscall
+[ 	]*9[ 	]+\# MMX
+[ 	]*10[ 	]+\?\?\?\? 0FFCDC   	paddb %mm4,%mm3
+[ 	]*11[ 	]+\# SSE
+[ 	]*12[ 	]+\?\?\?\? F30F58DC 	addss %xmm4,%xmm3
+[ 	]*13[ 	]+\# SSE2
+[ 	]*14[ 	]+\?\?\?\? F20F58DC 	addsd %xmm4,%xmm3
+[ 	]*15[ 	]+\# SSE3
+[ 	]*16[ 	]+addsubpd %xmm4,%xmm3
+[ 	]*17[ 	]+\# SSSE3
+[ 	]*18[ 	]+phaddw %xmm4,%xmm3
+[ 	]*19[ 	]+\# SSE4\.1
+[ 	]*20[ 	]+phminposuw  %xmm1,%xmm3
+[ 	]*21[ 	]+\# SSE4\.2
+[ 	]*22[ 	]+crc32   %ecx,%ebx
+[ 	]*23[ 	]+\# AVX
+[ 	]*24[ 	]+vzeroall
+[ 	]*25[ 	]+\# VMX
+[ 	]*26[ 	]+vmxoff
+[ 	]*27[ 	]+\# SMX
+[ 	]*28[ 	]+getsec
+[ 	]*29[ 	]+\# Xsave
+[ 	]*30[ 	]+xgetbv
+[ 	]*31[ 	]+\# Xsaveopt
+[ 	]*32[ 	]+xsaveopt \(%rcx\)
+[ 	]*33[ 	]+\# AES
+[ 	]*34[ 	]+aesenc  \(%rcx\),%xmm0
+[ 	]*35[ 	]+\# PCLMUL
+[ 	]*36[ 	]+pclmulqdq \$8,%xmm1,%xmm0
+[ 	]*37[ 	]+\# AES \+ AVX
+[ 	]*38[ 	]+vaesenc  \(%rcx\),%xmm0,%xmm2
+[ 	]*39[ 	]+\# PCLMUL \+ AVX
+[ 	]*40[ 	]+vpclmulqdq \$8,%xmm4,%xmm6,%xmm2
+[ 	]*41[ 	]+\# FMA
+[ 	]*42[ 	]+vfmadd132pd %xmm4,%xmm6,%xmm2
+[ 	]*43[ 	]+\# MOVBE
+[ 	]*44[ 	]+movbe   \(%rcx\),%ebx
+[ 	]*45[ 	]+\# CX16
+[ 	]*46[ 	]+cmpxchg16b \(%rsi\)
+[ 	]*47[ 	]+\# EPT
+[ 	]*48[ 	]+invept  \(%rcx\),%rbx
+[ 	]*49[ 	]+\# RDTSCP
+[ 	]*50[ 	]+rdtscp
+[ 	]*51[ 	]+\# 3DNow or PRFCHW
+[ 	]*52[ 	]+prefetchw   0x1000\(,%rsi,2\)
+[ 	]*53[ 	]+\# SSE4a
+[ 	]*54[ 	]+insertq %xmm2,%xmm1
+[ 	]*55[ 	]+\# SVME
+[ 	]*56[ 	]+vmload
+[ 	]*57[ 	]+\# ABM/LZCNT
+[ 	]*58[ 	]+lzcnt %ecx,%ebx
+[ 	]*59[ 	]+\# PadLock
+[ 	]*60[ 	]+xstorerng
+[ 	]*61[ 	]+\# BMI
+[ 	]*62[ 	]+blsr %ecx,%ebx
+[ 	]*63[ 	]+\# TBM
+[ 	]*64[ 	]+blcfill %ecx,%ebx
+[ 	]*65[ 	]+\# LAHF/SAHF
+[ 	]*66[ 	]+\?\?\?\? 9F       	lahf
--- /dev/null
+++ b/gas/testsuite/gas/i386/x86-64-arch-2-3.s
@@ -0,0 +1 @@
+.include "x86-64-arch-2.s"
--- a/gas/testsuite/gas/i386/x86-64-arch-2-lzcnt.d
+++ b/gas/testsuite/gas/i386/x86-64-arch-2-lzcnt.d
@@ -1,5 +1,5 @@
 #source: x86-64-arch-2.s
-#as: -march=generic64+avx+vmx+smx+xsave+xsaveopt+aes+pclmul+fma+movbe+cx16+ept+clflush+syscall+rdtscp+3dnowa+sse4a+svme+lzcnt+padlock+bmi+tbm
+#as: -march=generic64+avx+vmx+smx+xsave+xsaveopt+aes+pclmul+fma+movbe+cx16+lahf_sahf+ept+clflush+syscall+rdtscp+3dnowa+sse4a+svme+lzcnt+padlock+bmi+tbm
 #objdump: -dw
 #name: x86-64 arch 2 (lzcnt)
 #dump: x86-64-arch-2.d
--- a/gas/testsuite/gas/i386/x86-64-arch-2-prefetchw.d
+++ b/gas/testsuite/gas/i386/x86-64-arch-2-prefetchw.d
@@ -1,5 +1,5 @@
 #source: x86-64-arch-2.s
-#as: -march=generic64+avx+vmx+smx+xsave+xsaveopt+aes+pclmul+fma+movbe+cx16+ept+clflush+syscall+rdtscp+sse4a+svme+lzcnt+padlock+bmi+tbm+prfchw
+#as: -march=generic64+avx+vmx+smx+xsave+xsaveopt+aes+pclmul+fma+movbe+cx16+lahf_sahf+ept+clflush+syscall+rdtscp+sse4a+svme+lzcnt+padlock+bmi+tbm+prfchw
 #objdump: -dw
 #name: x86-64 arch 2 (prefetchw)
 #dump: x86-64-arch-2.d
--- a/opcodes/i386-gen.c
+++ b/opcodes/i386-gen.c
@@ -67,7 +67,7 @@ static const dependency isa_dependencies
   { "CORE2",
     "NOCONA|SSSE3" },
   { "COREI7",
-    "CORE2|SSE4_2|Rdtscp" },
+    "CORE2|SSE4_2|Rdtscp|LAHF_SAHF" },
   { "K6",
     "186|286|386|486|586|SYSCALL|387|MMX" },
   { "K6_2",
@@ -79,7 +79,7 @@ static const dependency isa_dependencies
   { "AMDFAM10",
     "K8|FISTTP|SSE4A|ABM" },
   { "BDVER1",
-    "GENERIC64|FISTTP|Rdtscp|CX16|XOP|ABM|LWP|SVME|AES|PCLMUL|PRFCHW" },
+    "GENERIC64|FISTTP|Rdtscp|CX16|LAHF_SAHF|XOP|ABM|LWP|SVME|AES|PCLMUL|PRFCHW" },
   { "BDVER2",
     "BDVER1|FMA|BMI|TBM|F16C" },
   { "BDVER3",
@@ -87,7 +87,7 @@ static const dependency isa_dependencies
   { "BDVER4",
     "BDVER3|AVX2|Movbe|BMI2|RdRnd|MWAITX" },
   { "ZNVER1",
-    "GENERIC64|FISTTP|Rdtscp|CX16|AVX2|SSE4A|ABM|SVME|AES|PCLMUL|PRFCHW|FMA|BMI|F16C|Xsaveopt|FSGSBase|Movbe|BMI2|RdRnd|ADX|RdSeed|SMAP|SHA|XSAVEC|XSAVES|ClflushOpt|CLZERO|MWAITX" },
+    "GENERIC64|FISTTP|Rdtscp|CX16|LAHF_SAHF|AVX2|SSE4A|ABM|SVME|AES|PCLMUL|PRFCHW|FMA|BMI|F16C|Xsaveopt|FSGSBase|Movbe|BMI2|RdRnd|ADX|RdSeed|SMAP|SHA|XSAVEC|XSAVES|ClflushOpt|CLZERO|MWAITX" },
   { "ZNVER2",
     "ZNVER1|CLWB|RDPID|RDPRU|MCOMMIT|WBNOINVD" },
   { "ZNVER3",
@@ -95,7 +95,7 @@ static const dependency isa_dependencies
   { "ZNVER4",
     "ZNVER3|AVX512F|AVX512DQ|AVX512IFMA|AVX512CD|AVX512BW|AVX512VL|AVX512_BF16|AVX512VBMI|AVX512_VBMI2|AVX512_VNNI|AVX512_BITALG|AVX512_VPOPCNTDQ|GFNI|RMPQUERY" },
   { "BTVER1",
-    "GENERIC64|FISTTP|CX16|Rdtscp|SSSE3|SSE4A|ABM|PRFCHW|CX16|Clflush|FISTTP|SVME" },
+    "GENERIC64|FISTTP|CX16|LAHF_SAHF|Rdtscp|SSSE3|SSE4A|ABM|PRFCHW|Clflush|FISTTP|SVME" },
   { "BTVER2",
     "BTVER1|AVX|BMI|F16C|AES|PCLMUL|Movbe|Xsaveopt|PRFCHW" },
   { "286",
@@ -313,6 +313,7 @@ static bitfield cpu_flags[] =
   BITFIELD (LM),
   BITFIELD (Movbe),
   BITFIELD (CX16),
+  BITFIELD (LAHF_SAHF),
   BITFIELD (EPT),
   BITFIELD (Rdtscp),
   BITFIELD (FSGSBase),
--- a/opcodes/i386-opc.h
+++ b/opcodes/i386-opc.h
@@ -137,6 +137,8 @@ enum
   CpuMovbe,
   /* CMPXCHG16B instruction support required.  */
   CpuCX16,
+  /* LAHF/SAHF instruction support required (in 64-bit mode).  */
+  CpuLAHF_SAHF,
   /* EPT Instructions required */
   CpuEPT,
   /* RDTSCP Instruction support required */
@@ -372,6 +374,7 @@ typedef union i386_cpu_flags
       unsigned int cputbm:1;
       unsigned int cpumovbe:1;
       unsigned int cpucx16:1;
+      unsigned int cpulahf_sahf:1;
       unsigned int cpuept:1;
       unsigned int cpurdtscp:1;
       unsigned int cpufsgsbase:1;
--- a/opcodes/i386-opc.tbl
+++ b/opcodes/i386-opc.tbl
@@ -264,8 +264,10 @@ cld, 0xfc, 0, NoSuf, {}
 cli, 0xfa, 0, NoSuf, {}
 clts, 0xf06, i286, NoSuf, {}
 cmc, 0xf5, 0, NoSuf, {}
-lahf, 0x9f, 0, NoSuf, {}
-sahf, 0x9e, 0, NoSuf, {}
+lahf, 0x9f, No64, NoSuf, {}
+lahf, 0x9f, LAHF_SAHF, NoSuf, {}
+sahf, 0x9e, No64, NoSuf, {}
+sahf, 0x9e, LAHF_SAHF, NoSuf, {}
 pushf, 0x9c, No64, DefaultSize|No_bSuf|No_sSuf|No_qSuf, {}
 pushf, 0x9c, x64, DefaultSize|No_bSuf|No_lSuf|No_sSuf|NoRex64, {}
 popf, 0x9d, No64, DefaultSize|No_bSuf|No_sSuf|No_qSuf, {}
