diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 1457eab..ff5f0db 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1950,11 +1950,7 @@ can_combine_p (rtx_insn *insn, rtx_insn *i3, rtx_insn *pred ATTRIBUTE_UNUSED, for (i = XVECLEN (PATTERN (i3), 0) - 1; i >= 0; i--) if (GET_CODE (XVECEXP (PATTERN (i3), 0, i)) == CLOBBER) { - /* Don't substitute for a register intended as a clobberable - operand. */ rtx reg = XEXP (XVECEXP (PATTERN (i3), 0, i), 0); - if (rtx_equal_p (reg, dest)) - return 0; /* If the clobber represents an earlyclobber operand, we must not substitute an expression containing the clobbered register. @@ -4963,6 +4959,11 @@ subst (rtx x, rtx from, rtx to, int in_dest, int in_cond, int unique_copy) || (REG_P (X) && REG_P (Y) \ && REGNO (X) == REGNO (Y) && GET_MODE (X) == GET_MODE (Y))) + /* Do not substitute into clobbers of regs -- this will never result in + valid RTL. */ + if (GET_CODE (x) == CLOBBER && REG_P (XEXP (x, 0))) + return x; + if (! in_dest && COMBINE_RTX_EQUAL_P (x, from)) { n_occurrences++; |