mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-03-20 09:20:42 +08:00
Code Issues Packages Projects Releases Wiki Activity

arm.md: New split to transform ((X << y) - 1) into ~(~(X-1) << y) for constant X.

Browse Source 
* arm.md: New split to transform ((X << y) - 1) into ~(~(X-1) << y)
for constant X.

From-SVN: r74417
This commit is contained in:
Richard Earnshaw 2003-12-08 11:05:59 +00:00 committed by Richard Earnshaw
parent c41affc725
commit de9315db9c
2 changed files with 19 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2003-12-08 Richard Earnshaw <rearnsha@arm.com>
* arm.md: New split to transform ((X << y) - 1) into ~(~(X-1) << y)
for constant X.
2003-12-08 Richard Sandiford <rsandifo@redhat.com>
* calls.c (expand_call): Don't try using tail or recursive calls

14
gcc/config/arm/arm.md
View File

@ -847,6 +847,20 @@
(set_attr "length" "4,8")]
)
; transform ((x << y) - 1) to ~(~(x-1) << y) Where X is a constant.
(define_split
[(set (match_operand:SI 0 "s_register_operand" "")
(plus:SI (ashift:SI (match_operand:SI 1 "const_int_operand" "")
(match_operand:SI 2 "s_register_operand" ""))
(const_int -1)))
(clobber (match_operand:SI 3 "s_register_operand" ""))]
"TARGET_ARM"
[(set (match_dup 3) (match_dup 1))
(set (match_dup 0) (not:SI (ashift:SI (match_dup 3) (match_dup 2))))]
"
operands[1] = GEN_INT (~(INTVAL (operands[1]) - 1));
")
(define_expand "addsf3"
[(set (match_operand:SF 0 "s_register_operand" "")
(plus:SF (match_operand:SF 1 "s_register_operand" "")