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arm.c (thumb1_compute_save_reg_mask): Make sure scratch reg does not overlap return value. 

2007-07-12  Paul Brook  <paul@codesourcery.com>

	gcc/
	* config/arm/arm.c (thumb1_compute_save_reg_mask): Make sure scratch
	reg does not overlap return value.

From-SVN: r126604
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Paul Brook 2007-07-12 21:28:27 +00:00 committed by Paul Brook
parent 2fe5bb9b5e
commit 19e723f40b
2 changed files with 9 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2007-07-12 Paul Brook <paul@codesourcery.com>
* config/arm/arm.c (thumb1_compute_save_reg_mask): Make sure scratch
reg does not overlap return value.
2007-07-12 Daniel Berlin <dberlin@dberlin.org>
* tree-ssa-pre.c (get_expression_vuses): Move out side-effect.

4
gcc/config/arm/arm.c
View File

@ -10182,6 +10182,10 @@ thumb1_compute_save_reg_mask (void)
have to push it. Use LAST_LO_REGNUM as our fallback
choice for the register to select. */
reg = thumb_find_work_register (1 << LAST_LO_REGNUM);
/* Make sure the register returned by thumb_find_work_register is
not part of the return value. */
if (reg * UNITS_PER_WORD <= arm_size_return_regs ())
reg = LAST_LO_REGNUM;
if (! call_used_regs[reg])
mask |= 1 << reg;