From 4b5e8abe18f9afc7a184e184182a609da1f819f0 Mon Sep 17 00:00:00 2001 From: Clinton Popetz Date: Fri, 14 Apr 2000 00:41:31 +0000 Subject: [PATCH] emit-rtl.c (try_split): Avoid infinite loop if the split results in a sequence that contains the... * emit-rtl.c (try_split): Avoid infinite loop if the split results in a sequence that contains the original insn. From-SVN: r33143 --- gcc/ChangeLog | 5 +++++ gcc/emit-rtl.c | 10 +++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 0b3925f11d8..a35633392e1 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Thu Apr 13 19:39:56 2000 Clinton Popetz + + * emit-rtl.c (try_split): Avoid infinite loop if the split + results in a sequence that contains the original insn. + 2000-04-13 Andreas Jaeger * config/mips/mips.c (expand_block_move): Pass alignment diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c index e697d55c455..8fd559ca928 100644 --- a/gcc/emit-rtl.c +++ b/gcc/emit-rtl.c @@ -2336,10 +2336,18 @@ try_split (pat, trial, last) it, in turn, will be split (SFmode on the 29k is an example). */ if (GET_CODE (seq) == SEQUENCE) { + int i; + + /* Avoid infinite loop if any insn of the result matches + the original pattern. */ + for (i = 0; i < XVECLEN (seq, 0); i++) + if (GET_CODE (XVECEXP (seq, 0, i)) == INSN + && rtx_equal_p (PATTERN (XVECEXP (seq, 0, i)), pat)) + return trial; + /* If we are splitting a JUMP_INSN, look for the JUMP_INSN in SEQ and copy our JUMP_LABEL to it. If JUMP_LABEL is non-zero, increment the usage count so we don't delete the label. */ - int i; if (GET_CODE (trial) == JUMP_INSN) for (i = XVECLEN (seq, 0) - 1; i >= 0; i--)