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change comment style in xtensa/lib1funcs.asm
- From: Bob Wilson <bwilson at tensilica dot com>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Mon, 23 Oct 2006 13:22:14 -0700
- Subject: change comment style in xtensa/lib1funcs.asm
I've committed this patch to use C-style (/* ... */) comments in the Xtensa
port's lib1funcs.asm file. The assembly comments, which start with '#' for
Xtensa, are dangerous. If the comments starts with "if" or "include", they are
interpreted as cpp directives.
2006-10-23 Bob Wilson <bob.wilson@acm.org>
* config/xtensa/lib1funcs.asm: Use C-style comments.
Index: config/xtensa/lib1funcs.asm
===================================================================
--- config/xtensa/lib1funcs.asm (revision 117978)
+++ config/xtensa/lib1funcs.asm (working copy)
@@ -30,8 +30,8 @@
#include "xtensa-config.h"
-# Define macros for the ABS and ADDX* instructions to handle cases
-# where they are not included in the Xtensa processor configuration.
+/* Define macros for the ABS and ADDX* instructions to handle cases
+ where they are not included in the Xtensa processor configuration. */
.macro do_abs dst, src, tmp
#if XCHAL_HAVE_ABS
@@ -70,10 +70,10 @@
#endif
.endm
-# Define macros for leaf function entry and return, supporting either the
-# standard register windowed ABI or the non-windowed call0 ABI. These
-# macros do not allocate any extra stack space, so they only work for
-# leaf functions that do not need to spill anything to the stack.
+/* Define macros for leaf function entry and return, supporting either the
+ standard register windowed ABI or the non-windowed call0 ABI. These
+ macros do not allocate any extra stack space, so they only work for
+ leaf functions that do not need to spill anything to the stack. */
.macro leaf_entry reg, size
#if XCHAL_HAVE_WINDOWED && !__XTENSA_CALL0_ABI__
@@ -126,20 +126,20 @@
#else /* !XCHAL_HAVE_MUL16 && !XCHAL_HAVE_MAC16 */
- # Multiply one bit at a time, but unroll the loop 4x to better
- # exploit the addx instructions and avoid overhead.
- # Peel the first iteration to save a cycle on init.
+ /* Multiply one bit at a time, but unroll the loop 4x to better
+ exploit the addx instructions and avoid overhead.
+ Peel the first iteration to save a cycle on init. */
- # Avoid negative numbers.
- xor a5, a2, a3 # top bit is 1 iff one of the inputs is negative
+ /* Avoid negative numbers. */
+ xor a5, a2, a3 /* Top bit is 1 if one input is negative. */
do_abs a3, a3, a6
do_abs a2, a2, a6
- # Swap so the second argument is smaller.
+ /* Swap so the second argument is smaller. */
sub a7, a2, a3
mov a4, a3
- movgez a4, a2, a7 # a4 = max(a2, a3)
- movltz a3, a2, a7 # a3 = min(a2, a3)
+ movgez a4, a2, a7 /* a4 = max (a2, a3) */
+ movltz a3, a2, a7 /* a3 = min (a2, a3) */
movi a2, 0
extui a6, a3, 0, 1
@@ -196,10 +196,10 @@
#endif /* L_mulsi3 */
-# Define a macro for the NSAU (unsigned normalize shift amount)
-# instruction, which computes the number of leading zero bits,
-# to handle cases where it is not included in the Xtensa processor
-# configuration.
+/* Define a macro for the NSAU (unsigned normalize shift amount)
+ instruction, which computes the number of leading zero bits,
+ to handle cases where it is not included in the Xtensa processor
+ configuration. */
.macro do_nsau cnt, val, tmp, a
#if XCHAL_HAVE_NSA
@@ -260,19 +260,19 @@
.type __udivsi3,@function
__udivsi3:
leaf_entry sp, 16
- bltui a3, 2, .Lle_one # check if the divisor <= 1
+ bltui a3, 2, .Lle_one /* check if the divisor <= 1 */
- mov a6, a2 # keep dividend in a6
- do_nsau a5, a6, a2, a7 # dividend_shift = nsau(dividend)
- do_nsau a4, a3, a2, a7 # divisor_shift = nsau(divisor)
+ mov a6, a2 /* keep dividend in a6 */
+ do_nsau a5, a6, a2, a7 /* dividend_shift = nsau (dividend) */
+ do_nsau a4, a3, a2, a7 /* divisor_shift = nsau (divisor) */
bgeu a5, a4, .Lspecial
- sub a4, a4, a5 # count = divisor_shift - dividend_shift
+ sub a4, a4, a5 /* count = divisor_shift - dividend_shift */
ssl a4
- sll a3, a3 # divisor <<= count
- movi a2, 0 # quotient = 0
+ sll a3, a3 /* divisor <<= count */
+ movi a2, 0 /* quotient = 0 */
- # test-subtract-and-shift loop; one quotient bit on each iteration
+ /* test-subtract-and-shift loop; one quotient bit on each iteration */
#if XCHAL_HAVE_LOOPS
loopnez a4, .Lloopend
#endif /* XCHAL_HAVE_LOOPS */
@@ -290,22 +290,22 @@
.Lloopend:
bltu a6, a3, .Lreturn
- addi a2, a2, 1 # increment quotient if dividend >= divisor
+ addi a2, a2, 1 /* increment quotient if dividend >= divisor */
.Lreturn:
leaf_return
.Lle_one:
- beqz a3, .Lerror # if divisor == 1, return the dividend
+ beqz a3, .Lerror /* if divisor == 1, return the dividend */
leaf_return
.Lspecial:
- # return dividend >= divisor
+ /* return dividend >= divisor */
bltu a6, a3, .Lreturn0
movi a2, 1
leaf_return
.Lerror:
- # just return 0; could throw an exception
+ /* just return 0; could throw an exception */
.Lreturn0:
movi a2, 0
@@ -321,20 +321,20 @@
.type __divsi3,@function
__divsi3:
leaf_entry sp, 16
- xor a7, a2, a3 # sign = dividend ^ divisor
- do_abs a6, a2, a4 # udividend = abs(dividend)
- do_abs a3, a3, a4 # udivisor = abs(divisor)
- bltui a3, 2, .Lle_one # check if udivisor <= 1
- do_nsau a5, a6, a2, a8 # udividend_shift = nsau(udividend)
- do_nsau a4, a3, a2, a8 # udivisor_shift = nsau(udivisor)
+ xor a7, a2, a3 /* sign = dividend ^ divisor */
+ do_abs a6, a2, a4 /* udividend = abs (dividend) */
+ do_abs a3, a3, a4 /* udivisor = abs (divisor) */
+ bltui a3, 2, .Lle_one /* check if udivisor <= 1 */
+ do_nsau a5, a6, a2, a8 /* udividend_shift = nsau (udividend) */
+ do_nsau a4, a3, a2, a8 /* udivisor_shift = nsau (udivisor) */
bgeu a5, a4, .Lspecial
- sub a4, a4, a5 # count = udivisor_shift - udividend_shift
+ sub a4, a4, a5 /* count = udivisor_shift - udividend_shift */
ssl a4
- sll a3, a3 # udivisor <<= count
- movi a2, 0 # quotient = 0
+ sll a3, a3 /* udivisor <<= count */
+ movi a2, 0 /* quotient = 0 */
- # test-subtract-and-shift loop; one quotient bit on each iteration
+ /* test-subtract-and-shift loop; one quotient bit on each iteration */
#if XCHAL_HAVE_LOOPS
loopnez a4, .Lloopend
#endif /* XCHAL_HAVE_LOOPS */
@@ -352,27 +352,27 @@
.Lloopend:
bltu a6, a3, .Lreturn
- addi a2, a2, 1 # increment quotient if udividend >= udivisor
+ addi a2, a2, 1 /* increment if udividend >= udivisor */
.Lreturn:
neg a5, a2
- movltz a2, a5, a7 # return (sign < 0) ? -quotient : quotient
+ movltz a2, a5, a7 /* return (sign < 0) ? -quotient : quotient */
leaf_return
.Lle_one:
beqz a3, .Lerror
- neg a2, a6 # if udivisor == 1, then return...
- movgez a2, a6, a7 # (sign < 0) ? -udividend : udividend
+ neg a2, a6 /* if udivisor == 1, then return... */
+ movgez a2, a6, a7 /* (sign < 0) ? -udividend : udividend */
leaf_return
.Lspecial:
- bltu a6, a3, .Lreturn0 # if dividend < divisor, return 0
+ bltu a6, a3, .Lreturn0 /* if dividend < divisor, return 0 */
movi a2, 1
movi a4, -1
- movltz a2, a4, a7 # else return (sign < 0) ? -1 : 1
+ movltz a2, a4, a7 /* else return (sign < 0) ? -1 : 1 */
leaf_return
.Lerror:
- # just return 0; could throw an exception
+ /* just return 0; could throw an exception */
.Lreturn0:
movi a2, 0
@@ -388,17 +388,17 @@
.type __umodsi3,@function
__umodsi3:
leaf_entry sp, 16
- bltui a3, 2, .Lle_one # check if the divisor is <= 1
+ bltui a3, 2, .Lle_one /* check if the divisor is <= 1 */
- do_nsau a5, a2, a6, a7 # dividend_shift = nsau(dividend)
- do_nsau a4, a3, a6, a7 # divisor_shift = nsau(divisor)
+ do_nsau a5, a2, a6, a7 /* dividend_shift = nsau (dividend) */
+ do_nsau a4, a3, a6, a7 /* divisor_shift = nsau (divisor) */
bgeu a5, a4, .Lspecial
- sub a4, a4, a5 # count = divisor_shift - dividend_shift
+ sub a4, a4, a5 /* count = divisor_shift - dividend_shift */
ssl a4
- sll a3, a3 # divisor <<= count
+ sll a3, a3 /* divisor <<= count */
- # test-subtract-and-shift loop
+ /* test-subtract-and-shift loop */
#if XCHAL_HAVE_LOOPS
loopnez a4, .Lloopend
#endif /* XCHAL_HAVE_LOOPS */
@@ -415,13 +415,13 @@
.Lspecial:
bltu a2, a3, .Lreturn
- sub a2, a2, a3 # subtract once more if dividend >= divisor
+ sub a2, a2, a3 /* subtract once more if dividend >= divisor */
.Lreturn:
leaf_return
.Lle_one:
- # the divisor is either 0 or 1, so just return 0.
- # someday we may want to throw an exception if the divisor is 0.
+ /* The divisor is either 0 or 1, so just return 0.
+ Someday we may want to throw an exception if the divisor is 0. */
movi a2, 0
leaf_return
.size __umodsi3,.-__umodsi3
@@ -435,19 +435,19 @@
.type __modsi3,@function
__modsi3:
leaf_entry sp, 16
- mov a7, a2 # save original (signed) dividend
- do_abs a2, a2, a4 # udividend = abs(dividend)
- do_abs a3, a3, a4 # udivisor = abs(divisor)
- bltui a3, 2, .Lle_one # check if udivisor <= 1
- do_nsau a5, a2, a6, a8 # udividend_shift = nsau(udividend)
- do_nsau a4, a3, a6, a8 # udivisor_shift = nsau(udivisor)
+ mov a7, a2 /* save original (signed) dividend */
+ do_abs a2, a2, a4 /* udividend = abs (dividend) */
+ do_abs a3, a3, a4 /* udivisor = abs (divisor) */
+ bltui a3, 2, .Lle_one /* check if udivisor <= 1 */
+ do_nsau a5, a2, a6, a8 /* udividend_shift = nsau (udividend) */
+ do_nsau a4, a3, a6, a8 /* udivisor_shift = nsau (udivisor) */
bgeu a5, a4, .Lspecial
- sub a4, a4, a5 # count = udivisor_shift - udividend_shift
+ sub a4, a4, a5 /* count = udivisor_shift - udividend_shift */
ssl a4
- sll a3, a3 # udivisor <<= count
+ sll a3, a3 /* udivisor <<= count */
- # test-subtract-and-shift loop
+ /* test-subtract-and-shift loop */
#if XCHAL_HAVE_LOOPS
loopnez a4, .Lloopend
#endif /* XCHAL_HAVE_LOOPS */
@@ -464,16 +464,16 @@
.Lspecial:
bltu a2, a3, .Lreturn
- sub a2, a2, a3 # subtract once more if udividend >= udivisor
+ sub a2, a2, a3 /* subtract again if udividend >= udivisor */
.Lreturn:
bgez a7, .Lpositive
- neg a2, a2 # if (dividend < 0), return -udividend
+ neg a2, a2 /* if (dividend < 0), return -udividend */
.Lpositive:
leaf_return
.Lle_one:
- # udivisor is either 0 or 1, so just return 0.
- # someday we may want to throw an exception if udivisor is 0.
+ /* udivisor is either 0 or 1, so just return 0.
+ Someday we may want to throw an exception if udivisor is 0. */
movi a2, 0
leaf_return
.size __modsi3,.-__modsi3