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| author | wilson <wilson@138bc75d-0d04-0410-961f-82ee72b054a4> | 1997-10-20 23:49:48 +0000 |
|---|---|---|
| committer | wilson <wilson@138bc75d-0d04-0410-961f-82ee72b054a4> | 1997-10-20 23:49:48 +0000 |
| commit | ea704d468b3e427b9bbdd5a7094067991d8f7e9d (patch) | |
| tree | d03ad1ae624e997721b0f00f9bfa6a320d91490b /gcc/cse.c | |
| parent | 6b96063fabde0e9641004807b968b914c3cb12b0 (diff) | |
| download | gcc-ea704d468b3e427b9bbdd5a7094067991d8f7e9d.tar.gz | |
Patches to fix minor optimizer bugs
* expmed.c (extract_bit_field): Don't make flag_force_mem disable
extzv for memory operands.
* cse.c (simplify_ternary_operation, case IF_THEN_ELSE): Collapse
redundant conditional moves to single operand.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@16129 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/cse.c b/gcc/cse.c index 425e1f1e51b..39ce6f6ba90 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -4669,6 +4669,16 @@ simplify_ternary_operation (code, mode, op0_mode, op0, op1, op2) case IF_THEN_ELSE: if (GET_CODE (op0) == CONST_INT) return op0 != const0_rtx ? op1 : op2; + + /* Convert a == b ? b : a to "a". */ + if (GET_CODE (op0) == NE && ! side_effects_p (op0) + && rtx_equal_p (XEXP (op0, 0), op1) + && rtx_equal_p (XEXP (op0, 1), op2)) + return op1; + else if (GET_CODE (op0) == EQ && ! side_effects_p (op0) + && rtx_equal_p (XEXP (op0, 1), op1) + && rtx_equal_p (XEXP (op0, 0), op2)) + return op2; break; default: |