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riscv-gcc-1
Commit 88285acf by Richard Kenner
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(mark_used_regs, case SUBREG): Set reg_changes_size even for integer 

modes.

From-SVN: r9205
parent 6bc2f582
Showing with 9 additions and 4 deletions
gcc/flow.c
/* Data flow analysis for GNU compiler.
Copyright (C) 1987, 1988, 1992, 1993, 1994 Free Software Foundation, Inc.
Copyright (C) 1987, 88, 92, 93, 94, 1995 Free Software Foundation, Inc.
This file is part of GNU CC.
......@@ -2379,9 +2379,7 @@ mark_used_regs (needed, live, x, final, insn)
if (GET_CODE (SUBREG_REG (x)) == REG
&& REGNO (SUBREG_REG (x)) >= FIRST_PSEUDO_REGISTER
&& (GET_MODE_SIZE (GET_MODE (x))
!= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))))
&& (INTEGRAL_MODE_P (GET_MODE (x))
|| INTEGRAL_MODE_P (GET_MODE (SUBREG_REG (x)))))
!= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))))
reg_changes_size[REGNO (SUBREG_REG (x))] = 1;
/* While we're here, optimize this case. */
......@@ -2572,6 +2570,13 @@ mark_used_regs (needed, live, x, final, insn)
|| GET_CODE (testreg) == SIGN_EXTRACT
|| GET_CODE (testreg) == SUBREG)
{
if (GET_CODE (testreg) == SUBREG
&& GET_CODE (SUBREG_REG (testreg)) == REG
&& REGNO (SUBREG_REG (testreg)) >= FIRST_PSEUDO_REGISTER
&& (GET_MODE_SIZE (GET_MODE (testreg))
!= GET_MODE_SIZE (GET_MODE (SUBREG_REG (testreg)))))
reg_changes_size[REGNO (SUBREG_REG (testreg))] = 1;
/* Modifying a single register in an alternate mode
does not use any of the old value. But these other
ways of storing in a register do use the old value. */
......
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