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[PR82096] Fix ICE in int_mode_for_mode with arm-linux-gnueabi 

The bug reported a particular test di-longlong64-sync-1.c failing when run
on arm-linux-gnueabi with options -mthumb -march=armv5t -O[g,1,2,3] and
-mthumb -march=armv6 -O[g,1,2,3].

The crash was caused because of the explicit VOIDmode argument that is sent
to emit_store_flag_force () and that the emit_store_flag_force () was not
handling the VOIDmode adequately. This patch fixes that.

ChangeLog entries:

*** gcc/ChangeLog ***

2017-01-11  Sudakshina Das  <sudi.das@arm.com>

	PR target/82096
	* expmed.c (emit_store_flag_force): Swap if const op0
	and change VOIDmode to mode of op0.

*** gcc/testsuite/ChangeLog ***

2017-01-11  Sudakshina Das  <sudi.das@arm.com>

	PR target/82096
	* gcc.c-torture/compile/pr82096.c: New test.

From-SVN: r256526
This commit is contained in:
Sudakshina Das 2018-01-11 10:46:59 +00:00 committed by Sudakshina Das
parent 69a3508539
commit f8f77d4d00
4 changed files with 31 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-01-11 Sudakshina Das <sudi.das@arm.com>
PR target/82096
* expmed.c (emit_store_flag_force): Swap if const op0
and change VOIDmode to mode of op0.
2018-01-11 Richard Sandiford <richard.sandiford@linaro.org>
PR rtl-optimization/83761

11
gcc/expmed.c
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@ -6082,6 +6082,17 @@ emit_store_flag_force (rtx target, enum rtx_code code, rtx op0, rtx op1,
if (tem != 0)
return tem;
/* If one operand is constant, make it the second one. Only do this
if the other operand is not constant as well. */
if (swap_commutative_operands_p (op0, op1))
{
std::swap (op0, op1);
code = swap_condition (code);
}
if (mode == VOIDmode)
mode = GET_MODE (op0);
if (!target)
target = gen_reg_rtx (word_mode);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-01-11 Sudakshina Das <sudi.das@arm.com>
PR target/82096
* gcc.c-torture/compile/pr82096.c: New test.
2018-01-11 Ed Schonberg <schonberg@adacore.com>
* gnat.dg/bip_overlay.adb, gnat.dg/bip_overlay.ads: New testcase.

9
gcc/testsuite/gcc.c-torture/compile/pr82096.c Normal file
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@ -0,0 +1,9 @@
/* { dg-additional-options "-march=armv5t -mthumb -mfloat-abi=soft" { target arm*-*-* } } */
static long long AL[24];
int
check_ok (void)
{
return (__sync_bool_compare_and_swap (AL+1, 0x200000003ll, 0x1234567890ll));
}