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(cse_insn): Ifdef out code that pre-truncates src_folded. 

From-SVN: r10127
This commit is contained in:
Richard Kenner 1995-07-14 08:15:00 -04:00
parent b7d9c4185d
commit e6a125a009
1 changed files with 8 additions and 0 deletions
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8
gcc/cse.c
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@ -6317,6 +6317,13 @@ cse_insn (insn, in_libcall_block)
simplified result, which may not necessarily be valid. */
src_folded = fold_rtx (src, insn);
#if 0
/* ??? This caused bad code to be generated for the m68k port with -O2.
Suppose src is (CONST_INT -1), and that after truncation src_folded
is (CONST_INT 3). Suppose src_folded is then used for src_const.
At the end we will add src and src_const to the same equivalence
class. We now have 3 and -1 on the same equivalence class. This
causes later instructions to be mis-optimized. */
/* If storing a constant in a bitfield, pre-truncate the constant
so we will be able to record it later. */
if (GET_CODE (SET_DEST (sets[i].rtl)) == ZERO_EXTRACT
@ -6332,6 +6339,7 @@ cse_insn (insn, in_libcall_block)
= GEN_INT (INTVAL (src) & (((HOST_WIDE_INT) 1
<< INTVAL (width)) - 1));
}
#endif
/* Compute SRC's hash code, and also notice if it
should not be recorded at all. In that case,