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| author | uros <uros@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-05-06 23:07:38 +0000 |
|---|---|---|
| committer | uros <uros@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-05-06 23:07:38 +0000 |
| commit | f1cb261b0d5cb297f6cfb07ff89f6f3c76cd9a7b (patch) | |
| tree | d0d1e86845c6acfe590e0fb217cd68dde6d90e4f /gcc/config/i386 | |
| parent | a846db2ca688b1fe633b71262ef608a17cd8f993 (diff) | |
| download | gcc-f1cb261b0d5cb297f6cfb07ff89f6f3c76cd9a7b.tar.gz | |
* config/i386/i386.md (ctz<mode>2): Emit rep;bsf even for !TARGET_BMI.
Emit bsf when optimizing for size.
(*ffs<mode>_1): Ditto.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@187219 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/config/i386')
| -rw-r--r-- | gcc/config/i386/i386.md | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index 360bd32b9ab..b78054fd549 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -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" |