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mips.h (REG_ALLOC_ORDER): Put call-clobbered registers first.

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gcc/
	* config/mips/mips.h (REG_ALLOC_ORDER): Put call-clobbered registers
	first.

From-SVN: r141362
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Richard Sandiford 2008-10-25 15:49:27 +00:00 committed by Richard Sandiford
parent 6af6748c20
commit 59dbe1d9da
2 changed files with 30 additions and 7 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2008-10-25 Richard Sandiford <rdsandiford@googlemail.com>
* config/mips/mips.h (REG_ALLOC_ORDER): Put call-clobbered registers
first.
2008-10-24 Michael Meissner <meissner@linux.vnet.ibm.com>
PR target/37841

32
gcc/config/mips/mips.h
View File

@ -1913,16 +1913,34 @@ enum reg_class
#define SMALL_REGISTER_CLASSES (TARGET_MIPS16)
/* REG_ALLOC_ORDER is to order in which to allocate registers. This
is the default value (allocate the registers in numeric order). We
define it just so that we can override it for the mips16 target in
ORDER_REGS_FOR_LOCAL_ALLOC. */
/* We generally want to put call-clobbered registers ahead of
call-saved ones. (IRA expects this.) */
#define REG_ALLOC_ORDER \
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, \
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, \
{ /* Call-clobbered GPRs. */ \
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, \
24, 25, 31, \
/* The global pointer. This is call-clobbered for o32 and o64 \
abicalls, call-saved for n32 and n64 abicalls, and a program \
invariant otherwise. Putting it between the call-clobbered \
and call-saved registers should cope with all eventualities. */ \
28, \
/* Call-saved GPRs. */ \
16, 17, 18, 19, 20, 21, 22, 23, 30, \
/* GPRs that can never be exposed to the register allocator. */ \
0, 26, 27, 29, \
/* Call-clobbered FPRs. */ \
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, \
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, \
48, 49, 50, 51, \
/* FPRs that are usually call-saved. The odd ones are actually \
call-clobbered for n32, but listing them ahead of the even \
registers might encourage the register allocator to fragment \
the available FPR pairs. We need paired FPRs to store long \
doubles, so it isn't clear that using a different order \
for n32 would be a win. */ \
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, \
/* None of the remaining classes have defined call-saved \
registers. */ \
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, \
80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, \
96, 97, 98, 99, 100,101,102,103,104,105,106,107,108,109,110,111, \