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| author | Richard Kenner <kenner@gcc.gnu.org> | 1992-09-20 05:50:34 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1992-09-20 05:50:34 -0400 |
| commit | 46da6b3a5a0124b854ec6b9ad518187b8df4e805 (patch) | |
| tree | a626302952c3481a3a6804f723767aea01cb034b /gcc | |
| parent | 3934c98b3078fb16e507cc9e7cae238a72756715 (diff) | |
| download | gcc-46da6b3a5a0124b854ec6b9ad518187b8df4e805.zip gcc-46da6b3a5a0124b854ec6b9ad518187b8df4e805.tar.gz gcc-46da6b3a5a0124b854ec6b9ad518187b8df4e805.tar.bz2 | |
(find_reloads, find_reloads_toplev): Treat BYTE_LOADS_SIGN_EXTEND just
like BYTE_LOADS_ZERO_EXTEND.
From-SVN: r2188
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/reload.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/gcc/reload.c b/gcc/reload.c index aa9a642..955af5f 100644 --- a/gcc/reload.c +++ b/gcc/reload.c @@ -2285,18 +2285,18 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p) /* Force reload if this is not a register or if there may may be a problem accessing the register in the outer mode. */ if (GET_CODE (operand) != REG -#ifdef BYTE_LOADS_ZERO_EXTEND - /* The comment below clearly does not match the code. +#if defined(BYTE_LOADS_ZERO_EXTEND) || defined(BYTE_LOADS_SIGN_EXTEND) + /* ??? The comment below clearly does not match the code. What the code below actually does is set force_reload for a paradoxical subreg of a pseudo. rms and kenner can't see the point of doing this. */ /* Nonparadoxical subreg of a pseudoreg. Don't to load the full width if on this machine - we expected the fetch to zero-extend. */ + we expected the fetch to extend. */ || ((GET_MODE_SIZE (operand_mode[i]) > GET_MODE_SIZE (GET_MODE (operand))) && REGNO (operand) >= FIRST_PSEUDO_REGISTER) -#endif /* BYTE_LOADS_ZERO_EXTEND */ +#endif /* Subreg of a hard reg which can't handle the subreg's mode or which would handle that mode in the wrong number of registers for subregging to work. */ @@ -3422,12 +3422,12 @@ find_reloads_toplev (x, ind_levels, is_set_dest) not offsettable. In that case, alter_subreg would produce an invalid address on big-endian machines. - For machines that zero-extend byte loads, we must not reload using + For machines that extend byte loads, we must not reload using a wider mode if we have a paradoxical SUBREG. find_reloads will force a reload in that case. So we should not do anything here. */ else if (regno >= FIRST_PSEUDO_REGISTER -#ifdef BYTE_LOADS_ZERO_EXTEND +#if defined(BYTE_LOADS_ZERO_EXTEND) || defined(BYTE_LOADS_SIGN_EXTEND) && (GET_MODE_SIZE (GET_MODE (x)) <= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) #endif |