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| author | Roger Sayle <roger@nextmovesoftware.com> | 2022-05-23 08:47:42 +0100 |
|---|---|---|
| committer | Roger Sayle <roger@nextmovesoftware.com> | 2022-05-23 08:47:42 +0100 |
| commit | 7707d7fddf7d6858399c8a47b139dc4708c5d7d9 (patch) | |
| tree | a426ea691f3525546d8b5bd081ddeca1b59ad1d7 /gcc/fortran/f95-lang.cc | |
| parent | 075fb873c264a030f56793cb162c9fdecbdd1773 (diff) | |
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Some additional ix86_rtx_costs clean-ups: NEG, AND, andn and pandn.
Double-word NOT requires two operations, but double-word NEG requires
three operations. Using SSE, vector NOT requires a pxor with -1, but
AND of NOT is cheap thanks to the existence of pandn. There's also some
legacy (aka incorrect) logic explicitly testing for DImode [independently
of TARGET_64BIT] in determining the cost of logic operations that's not
required.
2022-05-23 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
* config/i386/i386.cc (ix86_rtx_costs) <case AND>: Split from
XOR/IOR case. Account for two instructions for double-word
operations. In case of vector pandn, account for single
instruction. Likewise for integer andn with TARGET_BMI.
<case NOT>: Vector NOT requires more than 1 instruction (pxor).
<case NEG>: Double-word negation requires 3 instructions.
Diffstat (limited to 'gcc/fortran/f95-lang.cc')
0 files changed, 0 insertions, 0 deletions