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re PR target/49781 ([x32] Unnecessary lea in x32 mode)

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PR target/49781
	* config/i386/i386.c (ix86_decompose_address): Allow zero-extended
	SImode addresses.
	(ix86_print_operand_address): Handle zero-extended addresses.
	(memory_address_length): Add length of addr32 prefix for
	zero-extended addresses.
	(ix86_secondary_reload): Handle moves to/from double-word general
	registers from/to zero-extended addresses.
	* config/i386/predicates.md (lea_address_operand): Reject
	zero-extended operands.

From-SVN: r177566
This commit is contained in:
Uros Bizjak 2011-08-08 16:59:19 +02:00
parent d7cfa3145f
commit 473b30ce95
3 changed files with 49 additions and 11 deletions
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24
gcc/ChangeLog
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@ -1,8 +1,20 @@
2011-08-07 Uros Bizjak <ubizjak@gmail.com>
PR target/49781
* config/i386/i386.c (ix86_decompose_address): Allow zero-extended
SImode addresses.
(ix86_print_operand_address): Handle zero-extended addresses.
(memory_address_length): Add length of addr32 prefix for
zero-extended addresses.
(ix86_secondary_reload): Handle moves to/from double-word general
registers from/to zero-extended addresses.
* config/i386/predicates.md (lea_address_operand): Reject
zero-extended operands.
2011-08-08 H.J. Lu <hongjiu.lu@intel.com>
PR other/48007
* config.gcc (libgcc_tm_file): Add i386/value-unwind.h for
Linux/x86.
* config.gcc (libgcc_tm_file): Add i386/value-unwind.h for Linux/x86.
* system.h (REG_VALUE_IN_UNWIND_CONTEXT): Poisoned.
(ASSUME_EXTENDED_UNWIND_CONTEXT): Likewise.
@ -43,10 +55,8 @@
* config/sparc/driver-sparc.c: New file.
* config/sparc/x-sparc: New file.
* config.host: Use driver-sparc.o, sparc/x-sparc on
sparc*-*-solaris2*.
* config/sparc/sparc.opt (native): New value for enum
processor_type.
* config.host: Use driver-sparc.o, sparc/x-sparc on sparc*-*-solaris2*.
* config/sparc/sparc.opt (native): New value for enum processor_type.
* config/sparc/sparc-opts.h (PROCESSOR_NATIVE): Declare.
* config/sparc/sparc.c (sparc_option_override): Abort if
PROCESSOR_NATIVE gets here.
@ -93,7 +103,7 @@
(TARGET_INSTANTIATE_DECLS): New define.
2011-08-06 Paolo Bonzini <bonzini@gnu.org>
Mikael Morin <mikael.morin@sfr.fr>
Mikael Morin <mikael.morin@sfr.fr>
* Makefile.in (INCLUDES_FOR_TARGET): New.
(LIBGCC2_CFLAGS): Use it.

32
gcc/config/i386/i386.c
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@ -11142,6 +11142,14 @@ ix86_decompose_address (rtx addr, struct ix86_address *out)
int retval = 1;
enum ix86_address_seg seg = SEG_DEFAULT;
/* Allow zero-extended SImode addresses,
they will be emitted with addr32 prefix. */
if (TARGET_64BIT
&& GET_CODE (addr) == ZERO_EXTEND
&& GET_MODE (addr) == DImode
&& GET_MODE (XEXP (addr, 0)) == SImode)
addr = XEXP (addr, 0);
if (REG_P (addr))
base = addr;
else if (GET_CODE (addr) == SUBREG)
@ -14159,8 +14167,12 @@ ix86_print_operand_address (FILE *file, rtx addr)
}
else
{
/* Print DImode registers on 64bit targets to avoid addr32 prefixes. */
int code = TARGET_64BIT ? 'q' : 0;
int code = 0;
/* Print SImode registers for zero-extended addresses to force
addr32 prefix. Otherwise print DImode registers to avoid it. */
if (TARGET_64BIT)
code = (GET_CODE (addr) == ZERO_EXTEND) ? 'l' : 'q';
if (ASSEMBLER_DIALECT == ASM_ATT)
{
@ -21772,7 +21784,8 @@ assign_386_stack_local (enum machine_mode mode, enum ix86_stack_slot n)
}
/* Calculate the length of the memory address in the instruction
encoding. Does not include the one-byte modrm, opcode, or prefix. */
encoding. Includes addr32 prefix, does not include the one-byte modrm,
opcode, or other prefixes. */
int
memory_address_length (rtx addr)
@ -21799,7 +21812,9 @@ memory_address_length (rtx addr)
base = parts.base;
index = parts.index;
disp = parts.disp;
len = 0;
/* Add length of addr32 prefix. */
len = (GET_CODE (addr) == ZERO_EXTEND);
/* Rule of thumb:
- esp as the base always wants an index,
@ -28233,6 +28248,15 @@ ix86_secondary_reload (bool in_p, rtx x, reg_class_t rclass,
enum machine_mode mode,
secondary_reload_info *sri ATTRIBUTE_UNUSED)
{
/* Double-word spills from general registers to non-offsettable memory
references (zero-extended addresses) go through XMM register. */
if (TARGET_64BIT
&& MEM_P (x)
&& GET_MODE_SIZE (mode) > UNITS_PER_WORD
&& rclass == GENERAL_REGS
&& !offsettable_memref_p (x))
return SSE_REGS;
/* QImode spills from non-QI registers require
intermediate register on 32bit targets. */
if (!TARGET_64BIT

4
gcc/config/i386/predicates.md
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@ -801,6 +801,10 @@
struct ix86_address parts;
int ok;
/* LEA handles zero-extend by itself. */
if (GET_CODE (op) == ZERO_EXTEND)
return false;
ok = ix86_decompose_address (op, &parts);
gcc_assert (ok);
return parts.seg == SEG_DEFAULT;