diff options
| author | Uros Bizjak <ubizjak@gmail.com> | 2018-04-03 16:59:21 +0200 |
|---|---|---|
| committer | Uros Bizjak <uros@gcc.gnu.org> | 2018-04-03 16:59:21 +0200 |
| commit | 3bbeebd4d1ed20f1031d69e8ab646c687d58ee77 (patch) | |
| tree | 19bc8e63f17d9e4c7c667ea572f12b076aeda673 | |
| parent | d2d0710e1a88ec2a97939ab3ee87a84d1f62720a (diff) | |
| download | gcc-3bbeebd4d1ed20f1031d69e8ab646c687d58ee77.zip gcc-3bbeebd4d1ed20f1031d69e8ab646c687d58ee77.tar.gz gcc-3bbeebd4d1ed20f1031d69e8ab646c687d58ee77.tar.bz2 | |
i386.c (emit_i387_cw_initialization): Always use logic instructions when changing rounding bits to preserve precision...
* config/i386/i386.c (emit_i387_cw_initialization): Always use logic
instructions when changing rounding bits to preserve precision bits
in the x87 control word.
From-SVN: r259034
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 86 |
2 files changed, 31 insertions, 61 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index bac81f8..f1030b4 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2018-04-03 Uros Bizjak <ubizjak@gmail.com> + + * config/i386/i386.c (emit_i387_cw_initialization): Always use logic + instructions when changing rounding bits to preserve precision bits + in the x87 control word. + 2018-04-03 Martin Liska <mliska@suse.cz> PR tree-optimization/82491 diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 337545f..44ef60e 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -19678,72 +19678,36 @@ emit_i387_cw_initialization (int mode) emit_insn (gen_x86_fnstcw_1 (stored_mode)); emit_move_insn (reg, copy_rtx (stored_mode)); - if (TARGET_64BIT || TARGET_PARTIAL_REG_STALL - || optimize_insn_for_size_p ()) - { - switch (mode) - { - case I387_CW_TRUNC: - /* round toward zero (truncate) */ - emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0c00))); - slot = SLOT_CW_TRUNC; - break; - - case I387_CW_FLOOR: - /* round down toward -oo */ - emit_insn (gen_andhi3 (reg, reg, GEN_INT (~0x0c00))); - emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0400))); - slot = SLOT_CW_FLOOR; - break; - - case I387_CW_CEIL: - /* round up toward +oo */ - emit_insn (gen_andhi3 (reg, reg, GEN_INT (~0x0c00))); - emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0800))); - slot = SLOT_CW_CEIL; - break; - - case I387_CW_MASK_PM: - /* mask precision exception for nearbyint() */ - emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0020))); - slot = SLOT_CW_MASK_PM; - break; - - default: - gcc_unreachable (); - } - } - else + switch (mode) { - switch (mode) - { - case I387_CW_TRUNC: - /* round toward zero (truncate) */ - emit_insn (gen_insvsi_1 (reg, GEN_INT (0xc))); - slot = SLOT_CW_TRUNC; - break; + case I387_CW_TRUNC: + /* round toward zero (truncate) */ + emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0c00))); + slot = SLOT_CW_TRUNC; + break; - case I387_CW_FLOOR: - /* round down toward -oo */ - emit_insn (gen_insvsi_1 (reg, GEN_INT (0x4))); - slot = SLOT_CW_FLOOR; - break; + case I387_CW_FLOOR: + /* round down toward -oo */ + emit_insn (gen_andhi3 (reg, reg, GEN_INT (~0x0c00))); + emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0400))); + slot = SLOT_CW_FLOOR; + break; - case I387_CW_CEIL: - /* round up toward +oo */ - emit_insn (gen_insvsi_1 (reg, GEN_INT (0x8))); - slot = SLOT_CW_CEIL; - break; + case I387_CW_CEIL: + /* round up toward +oo */ + emit_insn (gen_andhi3 (reg, reg, GEN_INT (~0x0c00))); + emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0800))); + slot = SLOT_CW_CEIL; + break; - case I387_CW_MASK_PM: - /* mask precision exception for nearbyint() */ - emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0020))); - slot = SLOT_CW_MASK_PM; - break; + case I387_CW_MASK_PM: + /* mask precision exception for nearbyint() */ + emit_insn (gen_iorhi3 (reg, reg, GEN_INT (0x0020))); + slot = SLOT_CW_MASK_PM; + break; - default: - gcc_unreachable (); - } + default: + gcc_unreachable (); } gcc_assert (slot < MAX_386_STACK_LOCALS); |