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| author | Richard Henderson <rth@gcc.gnu.org> | 2001-02-18 12:44:44 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2001-02-18 12:44:44 -0800 |
| commit | 71641c15a697e6553cd3f27d104fb8a6aaeeab23 (patch) | |
| tree | 84431a91af5c4df0946f2157bd5213c6d1c608cc | |
| parent | 69a59a49f66f5996ff5c89b739399db0fbd66588 (diff) | |
| download | gcc-71641c15a697e6553cd3f27d104fb8a6aaeeab23.zip gcc-71641c15a697e6553cd3f27d104fb8a6aaeeab23.tar.gz gcc-71641c15a697e6553cd3f27d104fb8a6aaeeab23.tar.bz2 | |
* mips.c (mips_expand_prologue) Add REG_MAYBE_DEAD to
structure shift insns.
From-SVN: r39848
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/config/mips/mips.c | 15 |
2 files changed, 18 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6dad4f9..b764484 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,4 +1,9 @@ -2001-02-17 Mark Mitchell <mark@codesourcery.com> +2001-02-18 Shane Nay <shane@agendacomputing.com> + + * mips.c (mips_expand_prologue) Add REG_MAYBE_DEAD to + structure shift insns. + +2001-02-18 Mark Mitchell <mark@codesourcery.com> * invoke.texi (-fsquangle): Remove documentation. (-fname-mangling-version): Likewise. diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c index 1f19c98..74c548c 100644 --- a/gcc/config/mips/mips.c +++ b/gcc/config/mips/mips.c @@ -7115,13 +7115,22 @@ mips_expand_prologue () for (i = 0; i < num; i++) { - rtx pattern = RTVEC_ELT (adjust, i); + rtx insn, pattern; + + pattern = RTVEC_ELT (adjust, i); if (GET_CODE (pattern) != SET || GET_CODE (SET_SRC (pattern)) != ASHIFT) abort_with_insn (pattern, "Insn is not a shift"); - PUT_CODE (SET_SRC (pattern), ASHIFTRT); - emit_insn (pattern); + + insn = emit_insn (pattern); + + /* Global life information isn't valid at this point, so we + can't check whether these shifts are actually used. Mark + them MAYBE_DEAD so that flow2 will remove them, and not + complain about dead code in the prologue. */ + REG_NOTES(insn) = gen_rtx_EXPR_LIST (REG_MAYBE_DEAD, NULL_RTX, + REG_NOTES (insn)); } } |