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i386.md (ctz<mode>2): Emit rep;bsf only for TARGET_GENERIC, when not optimizing for size. 

* config/i386/i386.md (ctz<mode>2): Emit rep;bsf
	only for TARGET_GENERIC, when not optimizing for size.
	(*ffs<mode>_1): Ditto.

From-SVN: r187247
This commit is contained in:
Uros Bizjak 2012-05-07 16:38:41 +02:00 committed by Uros Bizjak
parent 198fc9f199
commit 60197adbfd
2 changed files with 28 additions and 14 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2012-05-07 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (ctz<mode>2): Emit rep;bsf
only for TARGET_GENERIC, when not optimizing for size.
(*ffs<mode>_1): Ditto.
2012-05-07 Steven Bosscher <steven@gcc.gnu.org> 2012-05-07 Steven Bosscher <steven@gcc.gnu.org>
* tree-cfg.c (verify_gimple_switch): Tighten checks. * tree-cfg.c (verify_gimple_switch): Tighten checks.

36
gcc/config/i386/i386.md
View File

@ -12113,21 +12113,25 @@
(ctz:SWI48 (match_dup 1)))] (ctz:SWI48 (match_dup 1)))]
"" ""
{ {
if (optimize_function_for_size_p (cfun)) if (TARGET_BMI)
return "bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
else if (TARGET_BMI)
return "tzcnt{<imodesuffix>}\t{%1, %0|%0, %1}"; return "tzcnt{<imodesuffix>}\t{%1, %0|%0, %1}";
else else if (optimize_function_for_size_p (cfun))
;
else if (TARGET_GENERIC)
/* tzcnt expands to rep;bsf and we can use it even if !TARGET_BMI. */ /* tzcnt expands to rep;bsf and we can use it even if !TARGET_BMI. */
return "rep; bsf{<imodesuffix>}\t{%1, %0|%0, %1}"; return "rep; bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
return "bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
} }
[(set_attr "type" "alu1") [(set_attr "type" "alu1")
(set_attr "prefix_0f" "1") (set_attr "prefix_0f" "1")
(set (attr "prefix_rep") (set (attr "prefix_rep")
(if_then_else (if_then_else
(match_test "optimize_function_for_size_p (cfun)") (ior (match_test "TARGET_BMI")
(const_string "0") (and (not (match_test "optimize_function_for_size_p (cfun)"))
(const_string "1"))) (match_test "TARGET_GENERIC")))
(const_string "1")
(const_string "0")))
(set_attr "mode" "<MODE>")]) (set_attr "mode" "<MODE>")])
(define_insn "ctz<mode>2" (define_insn "ctz<mode>2"
@ -12136,21 +12140,25 @@
(clobber (reg:CC FLAGS_REG))] (clobber (reg:CC FLAGS_REG))]
"" ""
{ {
if (optimize_function_for_size_p (cfun)) if (TARGET_BMI)
return "bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
else if (TARGET_BMI)
return "tzcnt{<imodesuffix>}\t{%1, %0|%0, %1}"; return "tzcnt{<imodesuffix>}\t{%1, %0|%0, %1}";
else else if (optimize_function_for_size_p (cfun))
;
else if (TARGET_GENERIC)
/* tzcnt expands to rep;bsf and we can use it even if !TARGET_BMI. */ /* tzcnt expands to rep;bsf and we can use it even if !TARGET_BMI. */
return "rep; bsf{<imodesuffix>}\t{%1, %0|%0, %1}"; return "rep; bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
return "bsf{<imodesuffix>}\t{%1, %0|%0, %1}";
} }
[(set_attr "type" "alu1") [(set_attr "type" "alu1")
(set_attr "prefix_0f" "1") (set_attr "prefix_0f" "1")
(set (attr "prefix_rep") (set (attr "prefix_rep")
(if_then_else (if_then_else
(match_test "optimize_function_for_size_p (cfun)") (ior (match_test "TARGET_BMI")
(const_string "0") (and (not (match_test "optimize_function_for_size_p (cfun)"))
(const_string "1"))) (match_test "TARGET_GENERIC")))
(const_string "1")
(const_string "0")))
(set_attr "mode" "<MODE>")]) (set_attr "mode" "<MODE>")])
(define_expand "clz<mode>2" (define_expand "clz<mode>2"