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[combine] Don't create LSHIFTRT of zero bits in change_zero_ext 

* combine.c (change_zero_ext): Do not create a shift of zero length.

From-SVN: r231613
This commit is contained in:
Kyrylo Tkachov 2015-12-14 11:33:00 +00:00 committed by Kyrylo Tkachov
parent f5a8c224d1
commit adb48173b8
2 changed files with 6 additions and 1 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2015-12-14 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* combine.c (change_zero_ext): Do not create a shift of zero length.
2015-12-14 Claudiu Zissulescu <claziss@synopsys.com>
* config/arc/arc.c (TARGET_NO_SPECULATION_IN_DELAY_SLOTS_P):

3
gcc/combine.c
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@ -11045,7 +11045,8 @@ change_zero_ext (rtx *src)
if (BITS_BIG_ENDIAN)
start = GET_MODE_PRECISION (mode) - size - start;
x = gen_rtx_LSHIFTRT (mode, XEXP (x, 0), GEN_INT (start));
x = simplify_gen_binary (LSHIFTRT, mode,
XEXP (x, 0), GEN_INT (start));
}
else if (GET_CODE (x) == ZERO_EXTEND
&& GET_CODE (XEXP (x, 0)) == SUBREG