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re PR target/43961 ([ARM thumb] "branch out of range" with thumb1_output_casesi)

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2013-01-15  Joseph Myers  <joseph@codesourcery.com>
	    Mikael Pettersson  <mikpe@it.uu.se>

	PR target/43961
	* config/arm/arm.h (ADDR_VEC_ALIGN): Align SImode jump tables for
	Thumb.
	(ASM_OUTPUT_CASE_LABEL): Remove.
	(ASM_OUTPUT_BEFORE_CASE_LABEL): Define to empty.
	* final.c (shorten_branches): Update alignment of labels before
	jump tables if CASE_VECTOR_SHORTEN_MODE.

Co-Authored-By: Mikael Pettersson <mikpe@it.uu.se>

From-SVN: r195208
This commit is contained in:
Joseph Myers 2013-01-15 16:17:28 +00:00 committed by Joseph Myers
parent b164615d79
commit b0fe107eed
3 changed files with 40 additions and 13 deletions
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11
gcc/ChangeLog
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@ -1,3 +1,14 @@
2013-01-15 Joseph Myers <joseph@codesourcery.com>
Mikael Pettersson <mikpe@it.uu.se>
PR target/43961
* config/arm/arm.h (ADDR_VEC_ALIGN): Align SImode jump tables for
Thumb.
(ASM_OUTPUT_CASE_LABEL): Remove.
(ASM_OUTPUT_BEFORE_CASE_LABEL): Define to empty.
* final.c (shorten_branches): Update alignment of labels before
jump tables if CASE_VECTOR_SHORTEN_MODE.
2013-01-15 Richard Biener <rguenther@suse.de>
PR bootstrap/55961

19
gcc/config/arm/arm.h
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@ -2129,20 +2129,13 @@ extern int making_const_table;
asm_fprintf (STREAM, "\tpop {%r}\n", REGNO); \
} while (0)
/* Jump table alignment is explicit in ASM_OUTPUT_CASE_LABEL. */
#define ADDR_VEC_ALIGN(JUMPTABLE) 0
#define ADDR_VEC_ALIGN(JUMPTABLE) \
((TARGET_THUMB && GET_MODE (PATTERN (JUMPTABLE)) == SImode) ? 2 : 0)
/* This is how to output a label which precedes a jumptable. Since
Thumb instructions are 2 bytes, we may need explicit alignment here. */
#undef ASM_OUTPUT_CASE_LABEL
#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
do \
{ \
if (TARGET_THUMB && GET_MODE (PATTERN (JUMPTABLE)) == SImode) \
ASM_OUTPUT_ALIGN (FILE, 2); \
(*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); \
} \
while (0)
/* Alignment for case labels comes from ADDR_VEC_ALIGN; avoid the
default alignment from elfos.h. */
#undef ASM_OUTPUT_BEFORE_CASE_LABEL
#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) /* Empty. */
/* Make sure subsequent insns are aligned after a TBB. */
#define ASM_OUTPUT_CASE_END(FILE, NUM, JUMPTABLE) \

23
gcc/final.c
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@ -1182,6 +1182,29 @@ shorten_branches (rtx first)
if (LABEL_P (insn))
{
int log = LABEL_TO_ALIGNMENT (insn);
#ifdef CASE_VECTOR_SHORTEN_MODE
/* If the mode of a following jump table was changed, we
may need to update the alignment of this label. */
rtx next;
bool next_is_jumptable;
next = next_nonnote_insn (insn);
next_is_jumptable = next && JUMP_TABLE_DATA_P (next);
if ((JUMP_TABLES_IN_TEXT_SECTION
|| readonly_data_section == text_section)
&& next_is_jumptable)
{
int newlog = ADDR_VEC_ALIGN (next);
if (newlog != log)
{
log = newlog;
LABEL_TO_ALIGNMENT (insn) = log;
something_changed = 1;
}
}
#endif
if (log > insn_current_align)
{
int align = 1 << log;