3.17.18 IA-64 Options
These are the ‘-m’ options defined for the Intel IA-64 architecture.
-mbig-endian- Generate code for a big-endian target. This is the default for HP-UX.
-mlittle-endian- Generate code for a little-endian target. This is the default for AIX5
and GNU/Linux.
-mgnu-as-mno-gnu-as- Generate (or don't) code for the GNU assembler. This is the default.
-mgnu-ld-mno-gnu-ld- Generate (or don't) code for the GNU linker. This is the default.
-mno-pic- Generate code that does not use a global pointer register. The result
is not position independent code, and violates the IA-64 ABI.
-mvolatile-asm-stop-mno-volatile-asm-stop- Generate (or don't) a stop bit immediately before and after volatile asm
statements.
-mregister-names-mno-register-names- Generate (or don't) ‘in’, ‘loc’, and ‘out’ register names for
the stacked registers. This may make assembler output more readable.
-mno-sdata-msdata- Disable (or enable) optimizations that use the small data section. This may
be useful for working around optimizer bugs.
-mconstant-gp- Generate code that uses a single constant global pointer value. This is
useful when compiling kernel code.
-mauto-pic- Generate code that is self-relocatable. This implies -mconstant-gp.
This is useful when compiling firmware code.
-minline-float-divide-min-latency- Generate code for inline divides of floating-point values
using the minimum latency algorithm.
-minline-float-divide-max-throughput- Generate code for inline divides of floating-point values
using the maximum throughput algorithm.
-mno-inline-float-divide- Do not generate inline code for divides of floating-point values.
-minline-int-divide-min-latency- Generate code for inline divides of integer values
using the minimum latency algorithm.
-minline-int-divide-max-throughput- Generate code for inline divides of integer values
using the maximum throughput algorithm.
-mno-inline-int-divide- Do not generate inline code for divides of integer values.
-minline-sqrt-min-latency- Generate code for inline square roots
using the minimum latency algorithm.
-minline-sqrt-max-throughput- Generate code for inline square roots
using the maximum throughput algorithm.
-mno-inline-sqrt- Do not generate inline code for
sqrt.
-mfused-madd-mno-fused-madd- Do (don't) generate code that uses the fused multiply/add or multiply/subtract
instructions. The default is to use these instructions.
-mno-dwarf2-asm-mdwarf2-asm- Don't (or do) generate assembler code for the DWARF 2 line number debugging
info. This may be useful when not using the GNU assembler.
-mearly-stop-bits-mno-early-stop-bits- Allow stop bits to be placed earlier than immediately preceding the
instruction that triggered the stop bit. This can improve instruction
scheduling, but does not always do so.
-mfixed-range=register-range- Generate code treating the given register range as fixed registers.
A fixed register is one that the register allocator cannot use. This is
useful when compiling kernel code. A register range is specified as
two registers separated by a dash. Multiple register ranges can be
specified separated by a comma.
-mtls-size=tls-size- Specify bit size of immediate TLS offsets. Valid values are 14, 22, and
64.
-mtune=cpu-type- Tune the instruction scheduling for a particular CPU, Valid values are
‘itanium’, ‘itanium1’, ‘merced’, ‘itanium2’,
and ‘mckinley’.
-milp32-mlp64- Generate code for a 32-bit or 64-bit environment.
The 32-bit environment sets int, long and pointer to 32 bits.
The 64-bit environment sets int to 32 bits and long and pointer
to 64 bits. These are HP-UX specific flags.
-mno-sched-br-data-spec-msched-br-data-spec- (Dis/En)able data speculative scheduling before reload.
This results in generation of
ld.a instructions and
the corresponding check instructions (ld.c / chk.a).
The default is 'disable'.
-msched-ar-data-spec-mno-sched-ar-data-spec- (En/Dis)able data speculative scheduling after reload.
This results in generation of
ld.a instructions and
the corresponding check instructions (ld.c / chk.a).
The default is 'enable'.
-mno-sched-control-spec-msched-control-spec- (Dis/En)able control speculative scheduling. This feature is
available only during region scheduling (i.e. before reload).
This results in generation of the
ld.s instructions and
the corresponding check instructions chk.s.
The default is 'disable'.
-msched-br-in-data-spec-mno-sched-br-in-data-spec- (En/Dis)able speculative scheduling of the instructions that
are dependent on the data speculative loads before reload.
This is effective only with -msched-br-data-spec enabled.
The default is 'enable'.
-msched-ar-in-data-spec-mno-sched-ar-in-data-spec- (En/Dis)able speculative scheduling of the instructions that
are dependent on the data speculative loads after reload.
This is effective only with -msched-ar-data-spec enabled.
The default is 'enable'.
-msched-in-control-spec-mno-sched-in-control-spec- (En/Dis)able speculative scheduling of the instructions that
are dependent on the control speculative loads.
This is effective only with -msched-control-spec enabled.
The default is 'enable'.
-mno-sched-prefer-non-data-spec-insns-msched-prefer-non-data-spec-insns- If enabled, data-speculative instructions are chosen for schedule
only if there are no other choices at the moment. This makes
the use of the data speculation much more conservative.
The default is 'disable'.
-mno-sched-prefer-non-control-spec-insns-msched-prefer-non-control-spec-insns- If enabled, control-speculative instructions are chosen for schedule
only if there are no other choices at the moment. This makes
the use of the control speculation much more conservative.
The default is 'disable'.
-mno-sched-count-spec-in-critical-path-msched-count-spec-in-critical-path- If enabled, speculative dependencies are considered during
computation of the instructions priorities. This makes the use of the
speculation a bit more conservative.
The default is 'disable'.
-msched-spec-ldc- Use a simple data speculation check. This option is on by default.
-msched-control-spec-ldc- Use a simple check for control speculation. This option is on by default.
-msched-stop-bits-after-every-cycle- Place a stop bit after every cycle when scheduling. This option is on
by default.
-msched-fp-mem-deps-zero-cost- Assume that floating-point stores and loads are not likely to cause a conflict
when placed into the same instruction group. This option is disabled by
default.
-msel-sched-dont-check-control-spec- Generate checks for control speculation in selective scheduling.
This flag is disabled by default.
-msched-max-memory-insns=max-insns- Limit on the number of memory insns per instruction group, giving lower
priority to subsequent memory insns attempting to schedule in the same
instruction group. Frequently useful to prevent cache bank conflicts.
The default value is 1.
-msched-max-memory-insns-hard-limit- Makes the limit specified by msched-max-memory-insns a hard limit,
disallowing more than that number in an instruction group.
Otherwise, the limit is “soft”, meaning that non-memory operations
are preferred when the limit is reached, but memory operations may still
be scheduled.