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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2015-05-13 13:26:45 +0200 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2015-05-13 13:26:45 +0200 |
| commit | 313b2cc05048521c3825e6a866860d6825bb4864 (patch) | |
| tree | c49518f2a74752137cad44dc0db90a02c2b87de8 | |
| parent | a540dfabf4839fdefb0d08bc034b94d64ab88e8c (diff) | |
| download | gcc-313b2cc05048521c3825e6a866860d6825bb4864.zip gcc-313b2cc05048521c3825e6a866860d6825bb4864.tar.gz gcc-313b2cc05048521c3825e6a866860d6825bb4864.tar.bz2 | |
combine.c (simplify_set): When generating a CC set...
* combine.c (simplify_set): When generating a CC set, if the
source already is in the correct mode, do not wrap it in a
compare. Simplify the rest of that code.
From-SVN: r223146
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/combine.c | 16 |
2 files changed, 12 insertions, 10 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d9a4fe4..2f8a020 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2015-05-13 Segher Boessenkool <segher@kernel.crashing.org> + + * combine.c (simplify_set): When generating a CC set, if the + source already is in the correct mode, do not wrap it in a + compare. Simplify the rest of that code. + 2015-05-13 Richard Biener <rguenther@suse.de> PR tree-optimization/66123 diff --git a/gcc/combine.c b/gcc/combine.c index 1c1a74f..5bb49cb 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -6705,20 +6705,16 @@ simplify_set (rtx x) if (other_changed) undobuf.other_insn = other_insn; - /* Otherwise, if we didn't previously have a COMPARE in the - correct mode, we need one. */ - if (GET_CODE (src) != COMPARE || GET_MODE (src) != compare_mode) - { - SUBST (SET_SRC (x), gen_rtx_COMPARE (compare_mode, op0, op1)); - src = SET_SRC (x); - } - else if (GET_MODE (op0) == compare_mode && op1 == const0_rtx) + /* Don't generate a compare of a CC with 0, just use that CC. */ + if (GET_MODE (op0) == compare_mode && op1 == const0_rtx) { SUBST (SET_SRC (x), op0); src = SET_SRC (x); } - /* Otherwise, update the COMPARE if needed. */ - else if (XEXP (src, 0) != op0 || XEXP (src, 1) != op1) + /* Otherwise, if we didn't previously have the same COMPARE we + want, create it from scratch. */ + else if (GET_CODE (src) != COMPARE || GET_MODE (src) != compare_mode + || XEXP (src, 0) != op0 || XEXP (src, 1) != op1) { SUBST (SET_SRC (x), gen_rtx_COMPARE (compare_mode, op0, op1)); src = SET_SRC (x); |