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| author | Sandra Loosemore <sandra@codesourcery.com> | 2018-11-03 14:12:44 -0400 |
|---|---|---|
| committer | Sandra Loosemore <sandra@gcc.gnu.org> | 2018-11-03 14:12:44 -0400 |
| commit | 2eae232fc5a21f533ab7042475de7d6906248d14 (patch) | |
| tree | 9b27591c63fb419a97dfbeffca2b69a0eab218b8 /gcc/config | |
| parent | b15ed67b3d103397393ebf07c92b0b3188d191cd (diff) | |
| download | gcc-2eae232fc5a21f533ab7042475de7d6906248d14.zip gcc-2eae232fc5a21f533ab7042475de7d6906248d14.tar.gz gcc-2eae232fc5a21f533ab7042475de7d6906248d14.tar.bz2 | |
re PR target/87079 (nios2 optimization for size - case of regression relatively to 5.3.0)
2018-11-03 Sandra Loosemore <sandra@codesourcery.com>
PR target/87079
gcc/
* config/nios2/nios2.c (nios2_rtx_costs): Recognize <mul>sidi3
pattern.
gcc/testsuite/
* gcc.target/nios2/pr87079-1.c: New.
* gcc.target/nios2/pr87079-2.c: New.
From-SVN: r265770
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/nios2/nios2.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/config/nios2/nios2.c b/gcc/config/nios2/nios2.c index 78d5858..e266924 100644 --- a/gcc/config/nios2/nios2.c +++ b/gcc/config/nios2/nios2.c @@ -1539,6 +1539,19 @@ nios2_rtx_costs (rtx x, machine_mode mode, *total = COSTS_N_INSNS (2); /* Latency adjustment. */ else *total = COSTS_N_INSNS (1); + if (TARGET_HAS_MULX && GET_MODE (x) == DImode) + { + enum rtx_code c0 = GET_CODE (XEXP (x, 0)); + enum rtx_code c1 = GET_CODE (XEXP (x, 1)); + if ((c0 == SIGN_EXTEND && c1 == SIGN_EXTEND) + || (c0 == ZERO_EXTEND && c1 == ZERO_EXTEND)) + /* This is the <mul>sidi3 pattern, which expands into 4 insns, + 2 multiplies and 2 moves. */ + { + *total = *total * 2 + COSTS_N_INSNS (2); + return true; + } + } return false; } |