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| author | Georg-Johann Lay <avr@gjlay.de> | 2011-11-07 18:08:35 +0000 |
|---|---|---|
| committer | Georg-Johann Lay <gjl@gcc.gnu.org> | 2011-11-07 18:08:35 +0000 |
| commit | 74155a6f37c3cabdf3875a560876c4b9fa3288f9 (patch) | |
| tree | bcb55390e087177125656ae46cc5b16fed327b82 /libgcc | |
| parent | 8b42d3defdd1d14a1bb8e6f0e5190045622cf915 (diff) | |
| download | gcc-74155a6f37c3cabdf3875a560876c4b9fa3288f9.zip gcc-74155a6f37c3cabdf3875a560876c4b9fa3288f9.tar.gz gcc-74155a6f37c3cabdf3875a560876c4b9fa3288f9.tar.bz2 | |
re PR target/49313 (Inefficient libgcc implementations for avr)
PR target/49313
* config/avr/lib1funcs.S (__divmodhi4, __divmodsi4): Tweak speed.
From-SVN: r181104
Diffstat (limited to 'libgcc')
| -rw-r--r-- | libgcc/ChangeLog | 5 | ||||
| -rw-r--r-- | libgcc/config/avr/lib1funcs.S | 104 |
2 files changed, 60 insertions, 49 deletions
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog index a0b5a89..6d05f0e 100644 --- a/libgcc/ChangeLog +++ b/libgcc/ChangeLog @@ -1,3 +1,8 @@ +2011-11-07 Georg-Johann Lay <avr@gjlay.de> + + PR target/49313 + * config/avr/lib1funcs.S (__divmodhi4, __divmodsi4): Tweak speed. + 2011-11-07 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> * config.host (tmake_file): Correct comment. diff --git a/libgcc/config/avr/lib1funcs.S b/libgcc/config/avr/lib1funcs.S index cd88a57..f7a8f63 100644 --- a/libgcc/config/avr/lib1funcs.S +++ b/libgcc/config/avr/lib1funcs.S @@ -562,30 +562,33 @@ ENDF __udivmodhi4 #if defined (L_divmodhi4) DEFUN __divmodhi4 - .global _div + .global _div _div: - bst r_arg1H,7 ; store sign of dividend - mov __tmp_reg__,r_arg1H - eor __tmp_reg__,r_arg2H ; r0.7 is sign of result - rcall __divmodhi4_neg1 ; dividend negative : negate - sbrc r_arg2H,7 - rcall __divmodhi4_neg2 ; divisor negative : negate - XCALL __udivmodhi4 ; do the unsigned div/mod - rcall __divmodhi4_neg1 ; correct remainder sign - tst __tmp_reg__ - brpl __divmodhi4_exit + bst r_arg1H,7 ; store sign of dividend + mov __tmp_reg__,r_arg2H + brtc 0f + com __tmp_reg__ ; r0.7 is sign of result + rcall __divmodhi4_neg1 ; dividend negative: negate +0: + sbrc r_arg2H,7 + rcall __divmodhi4_neg2 ; divisor negative: negate + XCALL __udivmodhi4 ; do the unsigned div/mod + sbrc __tmp_reg__,7 + rcall __divmodhi4_neg2 ; correct remainder sign + brtc __divmodhi4_exit +__divmodhi4_neg1: + ;; correct dividend/remainder sign + com r_arg1H + neg r_arg1L + sbci r_arg1H,0xff + ret __divmodhi4_neg2: - com r_arg2H - neg r_arg2L ; correct divisor/result sign - sbci r_arg2H,0xff + ;; correct divisor/result sign + com r_arg2H + neg r_arg2L + sbci r_arg2H,0xff __divmodhi4_exit: - ret -__divmodhi4_neg1: - brtc __divmodhi4_exit - com r_arg1H - neg r_arg1L ; correct dividend/remainder sign - sbci r_arg1H,0xff - ret + ret ENDF __divmodhi4 #endif /* defined (L_divmodhi4) */ @@ -807,36 +810,39 @@ ENDF __udivmodsi4 #if defined (L_divmodsi4) DEFUN __divmodsi4 - bst r_arg1HH,7 ; store sign of dividend - mov __tmp_reg__,r_arg1HH - eor __tmp_reg__,r_arg2HH ; r0.7 is sign of result - rcall __divmodsi4_neg1 ; dividend negative : negate - sbrc r_arg2HH,7 - rcall __divmodsi4_neg2 ; divisor negative : negate - XCALL __udivmodsi4 ; do the unsigned div/mod - rcall __divmodsi4_neg1 ; correct remainder sign - rol __tmp_reg__ - brcc __divmodsi4_exit + mov __tmp_reg__,r_arg2HH + bst r_arg1HH,7 ; store sign of dividend + brtc 0f + com __tmp_reg__ ; r0.7 is sign of result + rcall __divmodsi4_neg1 ; dividend negative: negate +0: + sbrc r_arg2HH,7 + rcall __divmodsi4_neg2 ; divisor negative: negate + XCALL __udivmodsi4 ; do the unsigned div/mod + sbrc __tmp_reg__, 7 ; correct quotient sign + rcall __divmodsi4_neg2 + brtc __divmodsi4_exit ; correct remainder sign +__divmodsi4_neg1: + ;; correct dividend/remainder sign + com r_arg1HH + com r_arg1HL + com r_arg1H + neg r_arg1L + sbci r_arg1H, 0xff + sbci r_arg1HL,0xff + sbci r_arg1HH,0xff + ret __divmodsi4_neg2: - com r_arg2HH - com r_arg2HL - com r_arg2H - neg r_arg2L ; correct divisor/quotient sign - sbci r_arg2H,0xff - sbci r_arg2HL,0xff - sbci r_arg2HH,0xff + ;; correct divisor/quotient sign + com r_arg2HH + com r_arg2HL + com r_arg2H + neg r_arg2L + sbci r_arg2H,0xff + sbci r_arg2HL,0xff + sbci r_arg2HH,0xff __divmodsi4_exit: - ret -__divmodsi4_neg1: - brtc __divmodsi4_exit - com r_arg1HH - com r_arg1HL - com r_arg1H - neg r_arg1L ; correct dividend/remainder sign - sbci r_arg1H, 0xff - sbci r_arg1HL,0xff - sbci r_arg1HH,0xff - ret + ret ENDF __divmodsi4 #endif /* defined (L_divmodsi4) */ |