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arm.c (thumb1_reorg): Check that the comparison is against the constant 0. 

2016-01-18  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    gcc/
    * config/arm/arm.c (thumb1_reorg): Check that the comparison is
    against the constant 0.

From-SVN: r232493
This commit is contained in:
Thomas Preud'homme 2016-01-18 03:22:35 +00:00 committed by Thomas Preud'homme
parent 5b3d5f769b
commit 39d44c531f
2 changed files with 14 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2016-01-18 Thomas Preud'homme <thomas.preudhomme@arm.com>
* config/arm/arm.c (thumb1_reorg): Check that the comparison is
against the constant 0.
2016-01-17 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/68799

13
gcc/config/arm/arm.c
View File

@ -17206,7 +17206,7 @@ thumb1_reorg (void)
FOR_EACH_BB_FN (bb, cfun)
{
rtx dest, src;
rtx pat, op0, set = NULL;
rtx cmp, op0, op1, set = NULL;
rtx_insn *prev, *insn = BB_END (bb);
bool insn_clobbered = false;
@ -17219,8 +17219,13 @@ thumb1_reorg (void)
continue;
/* Get the register with which we are comparing. */
pat = PATTERN (insn);
op0 = XEXP (XEXP (SET_SRC (pat), 0), 0);
cmp = XEXP (SET_SRC (PATTERN (insn)), 0);
op0 = XEXP (cmp, 0);
op1 = XEXP (cmp, 1);
/* Check that comparison is against ZERO. */
if (!CONST_INT_P (op1) || INTVAL (op1) != 0)
continue;
/* Find the first flag setting insn before INSN in basic block BB. */
gcc_assert (insn != BB_HEAD (bb));
@ -17260,7 +17265,7 @@ thumb1_reorg (void)
PATTERN (prev) = gen_rtx_SET (dest, src);
INSN_CODE (prev) = -1;
/* Set test register in INSN to dest. */
XEXP (XEXP (SET_SRC (pat), 0), 0) = copy_rtx (dest);
XEXP (cmp, 0) = copy_rtx (dest);
INSN_CODE (insn) = -1;
}
}