From 3f7bad27e22637aacf327c8ee885c11c56fe6c53 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Fri, 6 Aug 2010 18:22:48 +0000 Subject: Don't generate multi-byte NOPs for i686. gas/ 2010-08-06 Quentin Neill * config/tc-i386.c (arch_entry): Add negated bit to disambiguate flag names starting with "no". (cpu_arch): Add negated bit definitions. Add ".nop" CPU extension. (i386_align_code): Use new .cpunop bit to decide when to generate alignment using nops. (set_cpu_arch): Use negated bit instead to decide when to use cpu_flags or vs. cpu_flags_and_not. (md_parse_option): Likewise. gas/testsuite/ 2010-08-06 Quentin Neill * gas/i386/arch-10-1.l: Add nopl instruction. * gas/i386/arch-10-2.l: Likewise. * gas/i386/arch-10-3.l: Likewise. * gas/i386/arch-10-4.l: Likewise. * gas/i386/arch-10.s: Likewise. * gas/i386/arch-10.d: Add nopl instruction, and +nopl extension flag to as flags. * gas/i386/nops-5-i686.d: Change alignment code generated for -mtune=i686. * gas/i386/nops-5.d: Change alignment code generated for .arch i686. * gas/i386/x86-64-nops-5-k8.d: Likewise. * gas/i386/x86-64-nops-5.d: Likewise. opcodes/ 2010-08-06 Quentin Neill * i386-gen.c (cpu_flag_init): Define CpuNop extension flag, add to processor flags for PENTIUMPRO processors and later. * i386-opc.h (enum): Add CpuNop. (i386_cpu_flags): Add cpunop bit. * i386-opc.tbl: Change nop cpu_flags. * i386-init.h: Regenerated. * i386-tbl.h: Likewise. --- opcodes/i386-opc.tbl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'opcodes/i386-opc.tbl') diff --git a/opcodes/i386-opc.tbl b/opcodes/i386-opc.tbl index 4a3dc0b83d..366ee2943a 100644 --- a/opcodes/i386-opc.tbl +++ b/opcodes/i386-opc.tbl @@ -500,7 +500,7 @@ bound, 2, 0x62, None, 1, Cpu186|CpuNo64, Modrm|No_bSuf|No_sSuf|No_qSuf|No_ldSuf, hlt, 0, 0xf4, None, 1, 0, No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, { 0 } -nop, 1, 0xf1f, 0x0, 2, Cpu686, Modrm|No_bSuf|No_sSuf|No_ldSuf, { Reg16|Reg32|Reg64|Word|Dword|Qword|Unspecified|BaseIndex|Disp8|Disp16|Disp32|Disp32S } +nop, 1, 0xf1f, 0x0, 2, CpuNop, Modrm|No_bSuf|No_sSuf|No_ldSuf, { Reg16|Reg32|Reg64|Word|Dword|Qword|Unspecified|BaseIndex|Disp8|Disp16|Disp32|Disp32S } // nop is actually "xchg %ax,%ax" in 16bit mode, "xchg %eax,%eax" in // 32bit mode and "xchg %rax,%rax" in 64bit mode. -- cgit v1.2.1