diff options
author | Alexandre Oliva <aoliva@redhat.com> | 2018-11-09 10:16:09 +0000 |
---|---|---|
committer | Alexandre Oliva <aoliva@gcc.gnu.org> | 2018-11-09 10:16:09 +0000 |
commit | d4920f402af2591fa9864863f8c4ddcad1f9ebc1 (patch) | |
tree | fca3caf0766d3151c362068508b4da0f0763b702 /gcc/compare-elim.c | |
parent | b759ea284782b95cf0196c8e813e3ab7e1233c47 (diff) |
[PR86438] compare-elim: cope with set of in_b
When in_a resolves to a register set in the prev_clobber insn, we may
use the SET_SRC for the compare instead. However, when in_b so
resolves, we proceed to use the reg with its earlier value. When both
resolve to the same register and prev_clobber is an insn that modifies
the register, this arrangement may cause the compare to match (when it
shouldn't) and the elimination of the compare to incorrectly succeed.
(set (reg 1) (plus (reg 1) (const_int N)))
(set (reg 2) (reg 1))
(set (reg flags) (compare (reg 1) (reg 2)))
in_a: (reg 1) --> (plus (reg 1) (const_int N))
in_b: (reg 2) -> (reg 1) -/> oops
(parallel [
(set (reg flags) (compare (plus (reg 1) (const_int N))
(reg 1))) ;; should be (plus...)
(set (reg 1) (plus (reg 1) (const_int N)))])
(set (reg 2) (reg 1))
This patch arranges for in_b to also undergo SET_SRC substitution
when appropriate, with a shortcut for when in_a and in_b are the same
rtx.
for gcc/ChangeLog
PR rtl-optimization/86438
* compare-elim.c (try_eliminate_compare): Use SET_SRC instead
of in_b for the compare if in_b is SET_DEST.
for gcc/testsuite/ChangeLog
PR rtl-optimization/86438
* gcc.dg/torture/pr86438.c: New.
From-SVN: r265957
Diffstat (limited to 'gcc/compare-elim.c')
-rw-r--r-- | gcc/compare-elim.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/gcc/compare-elim.c b/gcc/compare-elim.c index 50bbaa84b6d..8afbe76c502 100644 --- a/gcc/compare-elim.c +++ b/gcc/compare-elim.c @@ -734,7 +734,7 @@ try_merge_compare (struct comparison *cmp) static bool try_eliminate_compare (struct comparison *cmp) { - rtx flags, in_a, in_b, cmp_src; + rtx flags, in_a, in_b, cmp_a, cmp_b; if (try_merge_compare (cmp)) return true; @@ -786,7 +786,7 @@ try_eliminate_compare (struct comparison *cmp) rtx x = XVECEXP (PATTERN (insn), 0, 0); if (rtx_equal_p (SET_DEST (x), in_a)) - cmp_src = SET_SRC (x); + cmp_a = SET_SRC (x); /* Also check operations with implicit extensions, e.g.: [(set (reg:DI) @@ -800,7 +800,7 @@ try_eliminate_compare (struct comparison *cmp) && (GET_CODE (SET_SRC (x)) == ZERO_EXTEND || GET_CODE (SET_SRC (x)) == SIGN_EXTEND) && GET_MODE (XEXP (SET_SRC (x), 0)) == GET_MODE (in_a)) - cmp_src = XEXP (SET_SRC (x), 0); + cmp_a = XEXP (SET_SRC (x), 0); /* Also check fully redundant comparisons, e.g.: [(set (reg:SI) @@ -811,7 +811,7 @@ try_eliminate_compare (struct comparison *cmp) && GET_CODE (SET_SRC (x)) == MINUS && rtx_equal_p (XEXP (SET_SRC (x), 0), in_a) && rtx_equal_p (XEXP (SET_SRC (x), 1), in_b)) - cmp_src = in_a; + cmp_a = in_a; else return false; @@ -819,17 +819,26 @@ try_eliminate_compare (struct comparison *cmp) /* If the source uses addressing modes with side effects, we can't do the merge because we'd end up with a PARALLEL that has two instances of that side effect in it. */ - if (side_effects_p (cmp_src)) + if (side_effects_p (cmp_a)) + return false; + + if (in_a == in_b) + cmp_b = cmp_a; + else if (rtx_equal_p (SET_DEST (x), in_b)) + cmp_b = SET_SRC (x); + else + cmp_b = in_b; + if (side_effects_p (cmp_b)) return false; /* Determine if we ought to use a different CC_MODE here. */ - flags = maybe_select_cc_mode (cmp, cmp_src, in_b); + flags = maybe_select_cc_mode (cmp, cmp_a, cmp_b); if (flags == NULL) flags = gen_rtx_REG (cmp->orig_mode, targetm.flags_regnum); /* Generate a new comparison for installation in the setter. */ - rtx y = copy_rtx (cmp_src); - y = gen_rtx_COMPARE (GET_MODE (flags), y, in_b); + rtx y = copy_rtx (cmp_a); + y = gen_rtx_COMPARE (GET_MODE (flags), y, copy_rtx (cmp_b)); y = gen_rtx_SET (flags, y); /* Canonicalize instruction to: |