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riscv-gcc-1
Commit f507a070 by Richard Kenner
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(simplify_set): Don't move a SUBREG to dest if it is changing the size 

of a hard reg in CLASS_CANNOT_CHANGE_SIZE.

From-SVN: r9346
parent 0639444f
Showing with 8 additions and 0 deletions
gcc/combine.c
...@@ -4334,6 +4334,14 @@ simplify_set (x) ...@@ -4334,6 +4334,14 @@ simplify_set (x)
&& (GET_MODE_SIZE (GET_MODE (src)) && (GET_MODE_SIZE (GET_MODE (src))
< GET_MODE_SIZE (GET_MODE (SUBREG_REG (src)))) < GET_MODE_SIZE (GET_MODE (SUBREG_REG (src))))
#endif #endif
#ifdef CLASS_CANNOT_CHANGE_SIZE
&& ! (GET_CODE (dest) == REG && REGNO (dest) < FIRST_PSEUDO_REGISTER
&& (TEST_HARD_REG_BIT
(reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE],
REGNO (dest)))
&& (GET_MODE_SIZE (GET_MODE (src))
!= GET_MODE_SIZE (GET_MODE (SUBREG_REG (src)))))
#endif
&& (GET_CODE (dest) == REG && (GET_CODE (dest) == REG
|| (GET_CODE (dest) == SUBREG || (GET_CODE (dest) == SUBREG
&& GET_CODE (SUBREG_REG (dest)) == REG))) && GET_CODE (SUBREG_REG (dest)) == REG)))
......
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