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| author | Richard Stallman <rms@gnu.org> | 1992-09-19 04:48:37 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1992-09-19 04:48:37 +0000 |
| commit | e8d76a395e5f1d93a17f4a353b8c80e620cb1597 (patch) | |
| tree | 14cefde7cd92b9311058c81e6e37f2b5c1215ba8 /gcc | |
| parent | f0c70ef08a3cce8fe2642fd47973cb05532faff5 (diff) | |
| download | gcc-e8d76a395e5f1d93a17f4a353b8c80e620cb1597.zip gcc-e8d76a395e5f1d93a17f4a353b8c80e620cb1597.tar.gz gcc-e8d76a395e5f1d93a17f4a353b8c80e620cb1597.tar.bz2 | |
(fold_rtx): For SUBREG, actually test subreg_lowpart_p in the code to handle narrowing subregs.
(fold_rtx): For SUBREG, actually test subreg_lowpart_p in the
code to handle narrowing subregs. And exclude binary ops like DIV
where truncating the args is not valid.
From-SVN: r2160
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cse.c | 9 |
1 files changed, 8 insertions, 1 deletions
@@ -4457,7 +4457,8 @@ fold_rtx (x, insn) can use the inner value. */ if (GET_CODE (folded_arg0) == REG - && GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (folded_arg0))) + && GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (folded_arg0)) + && subreg_lowpart_p (x)) { struct table_elt *elt; @@ -4472,6 +4473,8 @@ fold_rtx (x, insn) for (; elt; elt = elt->next_same_value) { + enum rtx_code eltcode = GET_CODE (elt->exp); + /* Just check for unary and binary operations. */ if (GET_RTX_CLASS (GET_CODE (elt->exp)) == '1' && GET_CODE (elt->exp) != SIGN_EXTEND @@ -4491,6 +4494,10 @@ fold_rtx (x, insn) } else if ((GET_RTX_CLASS (GET_CODE (elt->exp)) == '2' || GET_RTX_CLASS (GET_CODE (elt->exp)) == 'c') + && eltcode != DIV && eltcode != MOD + && eltcode != UDIV && eltcode != UMOD + && eltcode != ASHIFTRT && eltcode != LSHIFTRT + && eltcode != ROTATE && eltcode != ROTATERT && ((GET_CODE (XEXP (elt->exp, 0)) == SUBREG && (GET_MODE (SUBREG_REG (XEXP (elt->exp, 0))) == mode)) |