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| author | Jeffrey A Law <law@cygnus.com> | 1997-10-26 16:20:07 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1997-10-26 09:20:07 -0700 |
| commit | da0af5a56fc0b83f9c7f7eaa4038a4a627f4cfbc (patch) | |
| tree | cd9b5f643030d75564498fa835a6ecbfa4ee9281 /gcc | |
| parent | ca0f22208fdcfd30565f0163fdeab273af69456b (diff) | |
| download | gcc-da0af5a56fc0b83f9c7f7eaa4038a4a627f4cfbc.zip gcc-da0af5a56fc0b83f9c7f7eaa4038a4a627f4cfbc.tar.gz gcc-da0af5a56fc0b83f9c7f7eaa4038a4a627f4cfbc.tar.bz2 | |
loop.c (simplify_giv_expr): Adding two invariants results in an invariant.
* loop.c (simplify_giv_expr): Adding two invariants results
in an invariant.
From-SVN: r16179
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/loop.c | 12 |
2 files changed, 16 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 80d231e..a1b6628 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Sun Oct 26 09:21:40 1997 Jeffrey A Law (law@cygnus.com) + + * loop.c (simplify_giv_expr): Adding two invariants results + in an invariant. + Sun Oct 26 09:15:15 1997 Richard Henderson <rth@cygnus.com> * expr.c (get_inner_reference): Remove the array bias after @@ -5353,10 +5353,13 @@ simplify_giv_expr (x, benefit) case CONST_INT: case USE: /* Both invariant. Only valid if sum is machine operand. - First strip off possible USE on first operand. */ + First strip off possible USE on the operands. */ if (GET_CODE (arg0) == USE) arg0 = XEXP (arg0, 0); + if (GET_CODE (arg1) == USE) + arg1 = XEXP (arg1, 0); + tem = 0; if (CONSTANT_P (arg0) && GET_CODE (arg1) == CONST_INT) { @@ -5364,6 +5367,13 @@ simplify_giv_expr (x, benefit) if (GET_CODE (tem) != CONST_INT) tem = gen_rtx (USE, mode, tem); } + else + { + /* Adding two invariants must result in an invariant, + so enclose addition operation inside a USE and + return it. */ + tem = gen_rtx (USE, mode, gen_rtx (PLUS, mode, arg0, arg1)); + } return tem; |