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Specifying -mpowerpc-gpopt allows GCC to use the optional PowerPC architecture instructions in the General Purpose group, including floating-point square root. Specifying -mpowerpc-gfxopt allows GCC to use the optional PowerPC architecture instructions in the Graphics group, including floating-point select.

The -mpowerpc64 option allows GCC to generate the additional bit instructions that are found in the full PowerPC64 architecture and to treat GPRs as bit, doubleword quantities. GCC defaults to -mno-powerpc The other options specify a specific processor. Code generated under those options runs best on that processor, and may not run at all on others.

The -mcpu options automatically enable or disable the following options:. The particular options set for any particular CPU varies between compiler versions, depending on what setting seems to produce optimal code for that CPU; it doesn't necessarily reflect the actual hardware's capabilities. On AIX, the -maltivec and -mpowerpc64 options are not enabled or disabled by the -mcpu option at present because AIX does not have full support for these options.

You may still enable or disable them individually if you're sure it'll work in your environment. That is, element zero identifies the leftmost element in a vector register when targeting a big-endian platform, and identifies the rightmost element in a vector register when targeting a little-endian platform.

By default, these match array element order corresponding to the endianness for the target. If the -mno-upper-regs option is used, it turns off both -mupper-regs-sf and -mupper-regs-df options. The -mfloat option only works on PowerPC bit Linux systems.

If you use the ISA 3. Otherwise, IEEE bit floating point will be done with software emulation. If you use -mfloathardwareit will enable the option -mfloat as well. If you select ISA 3. If you receive a linker error message that saying you have overflowed the available TOC space, you can reduce the amount of TOC space used with the -mno-fp-in-toc and -mno-sum-in-toc options.

You may specify one or both of these options. If you still run out of space in the TOC even when you specify both of these options, specify -mminimal-toc instead. You may wish to use this option only on files that contain less frequently-executed code. IBM XL compilers access floating-point arguments that do not fit in the RSA from the stack when a subroutine is compiled without optimization.

Because always storing floating-point arguments on the stack is inefficient and rarely needed, this option is not enabled by default and only is necessary when calling subroutines compiled by IBM XL compilers without optimization. On bit Darwin, natural alignment is the default, and -malign-power is not supported. For example, by default a structure containing nothing but 8 unsigned bit-fields of length 1 is aligned to a 4-byte boundary and has a size of 4 bytes.

By using -mno-bit-alignthe structure is aligned to a 1-byte boundary and is 1 byte in size. Some linkers are capable of detecting out-of-range calls and generating glue code on the fly.

On these systems, long calls are unnecessary and generate slower code. The two target addresses represent the callee and the branch island. The branch island is appended to the body of the calling function; it computes the full bit address of the callee and jumps to it. On Mach-O Darwin systems, this option directs the compiler emit to the glue for every direct call, and the Darwin linker decides whether to use or discard it.

In the future, GCC may ignore all longcall specifications when the linker is known to generate glue. Older versions of GCC prior to 4. This is corrected in more recent versions of GCC. This option may be used to generate code that is compatible with functions compiled with older versions of GCC. The -mno-compat-align-parm option is the default.

The default for those is as specified in the relevant ABI. The default value of these options is determined when configuring GCC. The -mcpu options automatically enable or disable the following options: If both are ibm binary incompatible problem between gcc and xl compilers for vector data types, the code generated uses the architecture and registers set by -mcpubut the scheduling parameters set by -mtune.

The TOC is limited to 64k. The TOC and other static data may be up to a total of 4G in size. This is the default for bit Linux. The TOC may be up to 4G in size. Other data and code is only limited by the bit address space. This is the default when targeting a big-endian platform.

This is the default when targeting a little-endian platform. This option is currently ignored when targeting a big-endian platform. An example of a Cell microcode instruction is a variable shift.

Use -misel and -mno-isel instead. By default the port uses LRA. Use -mspe and -mno-spe instead. Also enable the use of built-in functions that allow more direct access to the vector instructions. The -mquad-memory option requires use of bit mode. The -mquad-memory-atomic option requires use of bit mode. This option is currently only available on the MPCx.

The bit environment sets int, long and pointer to 32 bits and generates code that runs on any PowerPC variant. The bit environment sets int to 32 bits and long and pointer to 64 bits, and generates code for PowerPC64, as for -mpowerpc The -mfull-toc option is selected by default.

However, only 16, entries are available in the TOC. Specifying -maix64 implies -mpowerpc64while -maix32 disables the bit ABI and implies -mno-powerpc GCC defaults to -maix Pass floating-point arguments to prototyped functions beyond the register save area RSA on the stack in addition to argument FPRs.

Do not assume that most significant double in bit long double value is properly rounded when comparing values and converting to double. Use XL symbol names for long double support routines. Link an application written to use message passing with special startup code to enable the application to run. The Parallel Environment does not support threads, so the -mpe option and the -pthread option are ibm binary incompatible problem between gcc and xl compilers for vector data types.

Software floating-point emulation is provided if you use the -msoft-float option, and pass the option to GCC when linking. Do not use -mmultiple on little-endian PowerPC systems, since those instructions do not work when the processor is in little-endian mode. Do not use -mstring on little-endian Ibm binary incompatible problem between gcc and xl compilers for vector data types systems, since those instructions do not work when the processor is in little-endian mode.

These instructions are generated by default. If you use -mno-updatethere is a small window between the time that the stack pointer is updated and the address of the previous frame is stored, which means code that walks the stack frame across interrupts or signals may get corrupted data. These instructions can incur a performance penalty on Power6 processors in certain situations, such as when stepping through large arrays that cross a 16M boundary.

This option is enabled by default when targeting Power6 and disabled otherwise. These instructions are generated by default if hardware floating point is used. These instructions are generated by default when targeting those processors. This instruction is generated by default when targeting those processors. A simple embedded PowerPC system loader should relocate the entire contents of.

For this to work, all objects linked together must be compiled with -mrelocatable or -mrelocatable-lib. Objects compiled with -mrelocatable-lib may be linked with objects compiled with any combination of the -mrelocatable options. The -mlittle-endian option is the same as -mlittle. The -mbig-endian option is the same as -mbig.

The resulting code is suitable for applications, but not shared libraries. The runtime system is responsible for initializing this register with an ibm binary incompatible problem between gcc and xl compilers for vector data types value before execution begins. The argument scheme takes one of the following ibm binary incompatible problem between gcc and xl compilers for vector data types Insert exactly as many NOPs as needed to force an insn to a new group, according to the estimated processor grouping.

Insert number NOPs to force an insn to a new group. Overriding the default ABI requires special system support and is likely to fail in spectacular ways. Otherwise, the compiler must insert an instruction before every non-prototyped call to set or clear bit 6 of the condition code register CR to indicate whether floating-point values are passed in the floating-point registers in case ibm binary incompatible problem between gcc and xl compilers for vector data types function takes variable arguments.

With -mprototypeonly calls to prototyped variable argument functions set or clear the bit. Selecting -mno-eabi means that the stack is aligned to a byte boundary, no EABI initialization function is called from mainand the -msdata option only uses r13 to point to a single small data area.

Put small initialized non- const global and static data in the. Put small uninitialized global and static data in the.

Put small uninitialized global data in the. Do not use register r13 to address small data however. This is the default behavior unless other -msdata options are used. The minimum value for num is 32 bytes on bit targets and 64 bytes on bit targets. The default value is target-specific.

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RX Options , Previous: RL78 Options , Up: You use these options to specify which instructions are available on the processor you are using.

The default value of these options is determined when configuring GCC. Specifying -mpowerpc-gpopt allows GCC to use the optional PowerPC architecture instructions in the General Purpose group, including floating-point square root. Specifying -mpowerpc-gfxopt allows GCC to use the optional PowerPC architecture instructions in the Graphics group, including floating-point select.

The -mpowerpc64 option allows GCC to generate the additional bit instructions that are found in the full PowerPC64 architecture and to treat GPRs as bit, doubleword quantities.

GCC defaults to -mno-powerpc The other options specify a specific processor. Code generated under those options runs best on that processor, and may not run at all on others. On AIX, the -maltivec and -mpowerpc64 options are not enabled or disabled by the -mcpu option at present because AIX does not have full support for these options. If both are specified, the code generated uses the architecture and registers set by -mcpu , but the scheduling parameters set by -mtune.

Generate PowerPC64 code for the medium model: The TOC and other static data may be up to a total of 4G in size. This is the default for bit Linux. Generate PowerPC64 code for the large model: The TOC may be up to 4G in size.

Other data and code is only limited by the bit address space. Generate code that uses does not use AltiVec instructions, and also enable the use of built-in functions that allow more direct access to the AltiVec instruction set. That is, element zero identifies the leftmost element in a vector register when targeting a big-endian platform, and identifies the rightmost element in a vector register when targeting a little-endian platform. Generate AltiVec instructions using big-endian element order, regardless of whether the target is big- or little-endian.

This is the default when targeting a big-endian platform. Using this option is currently deprecated. Support for this feature will be removed in GCC 9. By default, these match array element order corresponding to the endianness for the target.

Generate AltiVec instructions using little-endian element order, regardless of whether the target is big- or little-endian. This is the default when targeting a little-endian platform. This option is currently ignored when targeting a big-endian platform. Generate code that allows ld and ld. Generate code that uses a BSS. Enable the use disable of the built-in functions that allow direct access to the cryptographic instructions that were added in version 2. Enable disable the use of the built-in functions that allow direct access to the Hardware Transactional Memory HTM instructions that were added in version 2.

Generate code that keeps does not keeps some integer operations adjacent so that the instructions can be fused together on power8 and later processors.

Generate code that uses does not use the vector and scalar instructions that were added in version 2. Also enable the use of built-in functions that allow more direct access to the vector instructions. Generate code that uses does not use the non-atomic quad word memory instructions. The -mquad-memory option requires use of bit mode.

Generate code that uses does not use the atomic quad word memory instructions. The -mquad-memory-atomic option requires use of bit mode. If you use the ISA 3. Otherwise, if you do not specify to generate ISA 3. The bit environment sets int, long and pointer to 32 bits and generates code that runs on any PowerPC variant. The bit environment sets int to 32 bits and long and pointer to 64 bits, and generates code for PowerPC64, as for -mpowerpc The -mfull-toc option is selected by default.

However, only 16, entries are available in the TOC. If you receive a linker error message that saying you have overflowed the available TOC space, you can reduce the amount of TOC space used with the -mno-fp-in-toc and -mno-sum-in-toc options.

You may specify one or both of these options. If you still run out of space in the TOC even when you specify both of these options, specify -mminimal-toc instead.

You may wish to use this option only on files that contain less frequently-executed code. Specifying -maix64 implies -mpowerpc64 , while -maix32 disables the bit ABI and implies -mno-powerpc GCC defaults to -maix Pass floating-point arguments to prototyped functions beyond the register save area RSA on the stack in addition to argument FPRs. Do not assume that most significant double in bit long double value is properly rounded when comparing values and converting to double.

Use XL symbol names for long double support routines. IBM XL compilers access floating-point arguments that do not fit in the RSA from the stack when a subroutine is compiled without optimization. Because always storing floating-point arguments on the stack is inefficient and rarely needed, this option is not enabled by default and only is necessary when calling subroutines compiled by IBM XL compilers without optimization. Link an application written to use message passing with special startup code to enable the application to run.

The Parallel Environment does not support threads, so the -mpe option and the -pthread option are incompatible. On bit Darwin, natural alignment is the default, and -malign-power is not supported. Generate code that does not use uses the floating-point register set. Software floating-point emulation is provided if you use the -msoft-float option, and pass the option to GCC when linking. Generate code for single- or double-precision floating-point operations.

Do not generate sqrt and div instructions for hardware floating-point unit. Specify type of floating-point unit. Generate code that uses does not use the load multiple word instructions and the store multiple word instructions.

Do not use -mmultiple on little-endian PowerPC systems, since those instructions do not work when the processor is in little-endian mode.

Generate code that uses does not use the load or store instructions that update the base register to the address of the calculated memory location. These instructions are generated by default. If you use -mno-update , there is a small window between the time that the stack pointer is updated and the address of the previous frame is stored, which means code that walks the stack frame across interrupts or signals may get corrupted data.

Generate code that tries to avoid not avoid the use of indexed load or store instructions. These instructions can incur a performance penalty on Power6 processors in certain situations, such as when stepping through large arrays that cross a 16M boundary.

This option is enabled by default when targeting Power6 and disabled otherwise. Generate code that uses does not use the floating-point multiply and accumulate instructions. These instructions are generated by default if hardware floating point is used. Generate code that uses does not use the half-word multiply and multiply-accumulate instructions on the IBM , , and processors. These instructions are generated by default when targeting those processors.

This instruction is generated by default when targeting those processors. For example, by default a structure containing nothing but 8 unsigned bit-fields of length 1 is aligned to a 4-byte boundary and has a size of 4 bytes. By using -mno-bit-align , the structure is aligned to a 1-byte boundary and is 1 byte in size. Generate code that allows does not allow a static executable to be relocated to a different address at run time.

A simple embedded PowerPC system loader should relocate the entire contents of. For this to work, all objects linked together must be compiled with -mrelocatable or -mrelocatable-lib. Like -mrelocatable , -mrelocatable-lib generates a. Objects compiled with -mrelocatable-lib may be linked with objects compiled with any combination of the -mrelocatable options.

The -mlittle-endian option is the same as -mlittle. The -mbig-endian option is the same as -mbig. On Darwin and Mac OS X systems, compile code so that it is not relocatable, but that its external references are relocatable. The resulting code is suitable for applications, but not shared libraries. Treat the register used for PIC addressing as read-only, rather than loading it in the prologue for each function. The runtime system is responsible for initializing this register with an appropriate value before execution begins.

This option controls the priority that is assigned to dispatch-slot restricted instructions during the second scheduling pass. This option controls which dependences are considered costly by the target during instruction scheduling. This option controls which NOP insertion scheme is used during the second scheduling pass. The argument scheme takes one of the following values:. Insert NOPs to force costly dependent insns into separate groups.

Insert exactly as many NOPs as needed to force an insn to a new group, according to the estimated processor grouping. Insert number NOPs to force an insn to a new group. Select the type of traceback table. Extend the current ABI with a particular extension, or remove such extension.