config root man

mbig-endian
Target Report RejectNegative Mask(BIG_ENDIAN)
Generate big endian code

mlittle-endian
Target Report RejectNegative InverseMask(BIG_ENDIAN)
Generate little endian code

mgnu-as
Target Report Mask(GNU_AS)
Generate code for GNU as

mgnu-ld
Target Report Mask(GNU_LD)
Generate code for GNU ld

mvolatile-asm-stop
Target Report Mask(VOL_ASM_STOP)
Emit stop bits before and after volatile extended asms

mregister-names
Target Mask(REG_NAMES)
Use in/loc/out register names

mno-sdata
Target Report RejectNegative Mask(NO_SDATA)

msdata
Target Report RejectNegative InverseMask(NO_SDATA)
Enable use of sdata/scommon/sbss

mno-pic
Target Report RejectNegative Mask(NO_PIC)
Generate code without GP reg

mconstant-gp
Target Report RejectNegative Mask(CONST_GP)
gp is constant (but save/restore gp on indirect calls)

mauto-pic
Target Report RejectNegative Mask(AUTO_PIC)
Generate self-relocatable code

minline-float-divide-min-latency
Target Report RejectNegative Var(TARGET_INLINE_FLOAT_DIV, 1)
Generate inline floating point division, optimize for latency

minline-float-divide-max-throughput
Target Report RejectNegative Var(TARGET_INLINE_FLOAT_DIV, 2) Init(2)
Generate inline floating point division, optimize for throughput

mno-inline-float-divide
Target Report RejectNegative Var(TARGET_INLINE_FLOAT_DIV, 0)

minline-int-divide-min-latency
Target Report RejectNegative Var(TARGET_INLINE_INT_DIV, 1)
Generate inline integer division, optimize for latency

minline-int-divide-max-throughput
Target Report RejectNegative Var(TARGET_INLINE_INT_DIV, 2)
Generate inline integer division, optimize for throughput

mno-inline-int-divide
Target Report RejectNegative Var(TARGET_INLINE_INT_DIV, 0)
Do not inline integer division

minline-sqrt-min-latency
Target Report RejectNegative Var(TARGET_INLINE_SQRT, 1)
Generate inline square root, optimize for latency

minline-sqrt-max-throughput
Target Report RejectNegative Var(TARGET_INLINE_SQRT, 2)
Generate inline square root, optimize for throughput

mno-inline-sqrt
Target Report RejectNegative Var(TARGET_INLINE_SQRT, 0)
Do not inline square root

mdwarf2-asm
Target Report Mask(DWARF2_ASM)
Enable Dwarf 2 line debug info via GNU as

mearly-stop-bits
Target Report Mask(EARLY_STOP_BITS)
Enable earlier placing stop bits for better scheduling

mfixed-range=
Target RejectNegative Joined
Specify range of registers to make fixed

mtls-size=
Target RejectNegative Joined UInteger Var(ia64_tls_size) Init(22)
Specify bit size of immediate TLS offsets

mtune=
Target RejectNegative Joined
Schedule code for given CPU

msched-br-data-spec
Target Report Var(mflag_sched_br_data_spec) Init(0)
Use data speculation before reload

msched-ar-data-spec
Target Report Var(mflag_sched_ar_data_spec) Init(1)
Use data speculation after reload

msched-control-spec
Target Report Var(mflag_sched_control_spec) Init(0)
Use control speculation

msched-br-in-data-spec
Target Report Var(mflag_sched_br_in_data_spec) Init(1)
Use in block data speculation before reload

msched-ar-in-data-spec
Target Report Var(mflag_sched_ar_in_data_spec) Init(1)
Use in block data speculation after reload

msched-in-control-spec
Target Report Var(mflag_sched_in_control_spec) Init(1)
Use in block control speculation

msched-ldc
Target Report Var(mflag_sched_ldc) Init(1)
Use simple data speculation check

msched-control-ldc
Target Report Var(mflag_control_ldc) Init(0)
Use simple data speculation check for control speculation

msched-spec-verbose
Common Report Var(mflag_sched_spec_verbose) Init(0)
Print information about speculative motions.

msched-prefer-non-data-spec-insns
Common Report Var(mflag_sched_prefer_non_data_spec_insns) Init(0)
If set, data speculative instructions will be chosen for schedule only if there are no other choices at the moment 

msched-prefer-non-control-spec-insns
Common Report Var(mflag_sched_prefer_non_control_spec_insns) Init(0)
If set, control speculative instructions will be chosen for schedule only if there are no other choices at the moment 

msched-count-spec-in-critical-path
Common Report Var(mflag_sched_count_spec_in_critical_path) Init(0)
Count speculative dependencies while calculating priority of instructions

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