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| author | Jeffrey A Law <law@cygnus.com> | 1997-11-04 23:09:21 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1997-11-04 16:09:21 -0700 |
| commit | 73774bc7c0e05ba6bc4f81997d6145ce2c427b21 (patch) | |
| tree | 476445edc9aeed101589d0824bd4334a68ce425f /gcc/alias.c | |
| parent | 30c317f5da1ff0144dd6dd8143d830a2223f17b8 (diff) | |
| download | gcc-73774bc7c0e05ba6bc4f81997d6145ce2c427b21.zip gcc-73774bc7c0e05ba6bc4f81997d6145ce2c427b21.tar.gz gcc-73774bc7c0e05ba6bc4f81997d6145ce2c427b21.tar.bz2 | |
alias.c (find_base_value): When copying arguments, return the tenative value for a hard register.
* alias.c (find_base_value): When copying arguments, return the
tenative value for a hard register.
From-SVN: r16319
Diffstat (limited to 'gcc/alias.c')
| -rw-r--r-- | gcc/alias.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/gcc/alias.c b/gcc/alias.c index 855abae..0943444 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -95,16 +95,19 @@ find_base_value (src) return src; case REG: - /* If this REG is related to a known base value, return it. */ - if (reg_base_value[REGNO (src)]) - return reg_base_value[REGNO (src)]; - /* At the start of a function argument registers have known base values which may be lost later. Returning an ADDRESS expression here allows optimization based on argument values even when the argument registers are used for other purposes. */ if (REGNO (src) < FIRST_PSEUDO_REGISTER && copying_arguments) return new_reg_base_value[REGNO (src)]; + + /* If this REG is related to a known base value, return it. + This must happen after the arg register check above to avoid + circular set chains. */ + if (reg_base_value[REGNO (src)]) + return reg_base_value[REGNO (src)]; + return src; case MEM: |