diff options
Diffstat (limited to 'gcc/rtlanal.c')
| -rw-r--r-- | gcc/rtlanal.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index bacc5f2..b4dff86 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -2946,10 +2946,13 @@ inequality_comparisons_p (const_rtx x) not enter into CONST_DOUBLE for the replace. Note that copying is not done so X must not be shared unless all copies - are to be modified. */ + are to be modified. + + ALL_REGS is true if we want to replace all REGs equal to FROM, not just + those pointer-equal ones. */ rtx -replace_rtx (rtx x, rtx from, rtx to) +replace_rtx (rtx x, rtx from, rtx to, bool all_regs) { int i, j; const char *fmt; @@ -2961,9 +2964,17 @@ replace_rtx (rtx x, rtx from, rtx to) if (x == 0) return 0; - if (GET_CODE (x) == SUBREG) + if (all_regs + && REG_P (x) + && REG_P (from) + && REGNO (x) == REGNO (from)) + { + gcc_assert (GET_MODE (x) == GET_MODE (from)); + return to; + } + else if (GET_CODE (x) == SUBREG) { - rtx new_rtx = replace_rtx (SUBREG_REG (x), from, to); + rtx new_rtx = replace_rtx (SUBREG_REG (x), from, to, all_regs); if (CONST_INT_P (new_rtx)) { @@ -2979,7 +2990,7 @@ replace_rtx (rtx x, rtx from, rtx to) } else if (GET_CODE (x) == ZERO_EXTEND) { - rtx new_rtx = replace_rtx (XEXP (x, 0), from, to); + rtx new_rtx = replace_rtx (XEXP (x, 0), from, to, all_regs); if (CONST_INT_P (new_rtx)) { @@ -2997,10 +3008,11 @@ replace_rtx (rtx x, rtx from, rtx to) for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--) { if (fmt[i] == 'e') - XEXP (x, i) = replace_rtx (XEXP (x, i), from, to); + XEXP (x, i) = replace_rtx (XEXP (x, i), from, to, all_regs); else if (fmt[i] == 'E') for (j = XVECLEN (x, i) - 1; j >= 0; j--) - XVECEXP (x, i, j) = replace_rtx (XVECEXP (x, i, j), from, to); + XVECEXP (x, i, j) = replace_rtx (XVECEXP (x, i, j), + from, to, all_regs); } return x; |