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i386.md (ctz<mode>2): Emit rep;bsf even for !TARGET_BMI. 

* config/i386/i386.md (ctz<mode>2): Emit rep;bsf even for !TARGET_BMI.
	Emit bsf when optimizing for size.
	(*ffs<mode>_1): Ditto.


Co-Authored-By: Paolo Bonzini <bonzini@gnu.org>

From-SVN: r187219
This commit is contained in:
Uros Bizjak 2012-05-07 01:07:38 +02:00 committed by Uros Bizjak
parent 0345d1dd2a
commit 19010925aa
2 changed files with 32 additions and 5 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2012-05-07 Uros Bizjak <ubizjak@gmail.com>
Paolo Bonzini <bonzini@gnu.org>
* config/i386/i386.md (ctz<mode>2): Emit rep;bsf even for !TARGET_BMI.
Emit bsf when optimizing for size.
(*ffs<mode>_1): Ditto.
2012-05-07 Oleg Endo <olegendo@gcc.gnu.org>
PR target/53250

30
gcc/config/i386/i386.md
View File

@ -12112,9 +12112,22 @@
(set (match_operand:SWI48 0 "register_operand" "=r")
(ctz:SWI48 (match_dup 1)))]
""
"bsf{<imodesuffix>}\t{%1, %0|%0, %1}"
{
if (optimize_function_for_size_p (cfun))
return "bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
else if (TARGET_BMI)
return "tzcnt{<imodesuffix>}\t{%1, %0|%0, %1}";
else
/* tzcnt expands to rep;bsf and we can use it even if !TARGET_BMI. */
return "rep; bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
}
[(set_attr "type" "alu1")
(set_attr "prefix_0f" "1")
(set (attr "prefix_rep")
(if_then_else
(match_test "optimize_function_for_size_p (cfun)")
(const_string "0")
(const_string "1")))
(set_attr "mode" "<MODE>")])
(define_insn "ctz<mode>2"
@ -12123,14 +12136,21 @@
(clobber (reg:CC FLAGS_REG))]
""
{
if (TARGET_BMI)
return "tzcnt{<imodesuffix>}\t{%1, %0|%0, %1}";
else
if (optimize_function_for_size_p (cfun))
return "bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
else if (TARGET_BMI)
return "tzcnt{<imodesuffix>}\t{%1, %0|%0, %1}";
else
/* tzcnt expands to rep;bsf and we can use it even if !TARGET_BMI. */
return "rep; bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
}
[(set_attr "type" "alu1")
(set_attr "prefix_0f" "1")
(set (attr "prefix_rep") (symbol_ref "TARGET_BMI"))
(set (attr "prefix_rep")
(if_then_else
(match_test "optimize_function_for_size_p (cfun)")
(const_string "0")
(const_string "1")))
(set_attr "mode" "<MODE>")])
(define_expand "clz<mode>2"