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i386.c (ix86_expand_int_movcc): In the case where the comparison directly gives a mask suppress addition when...

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* config/i386/i386.c (ix86_expand_int_movcc): In the case where
        the comparison directly gives a mask suppress addition when cf is
        zero by complementing the mask.

From-SVN: r55505
This commit is contained in:
Rodney Brown 2002-07-17 01:36:36 +00:00 committed by Richard Henderson
parent 2aa9948d9b
commit 06ec023fb9
2 changed files with 16 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2002-07-16 Rodney Brown <rbrown64@csc.com.au>
* config/i386/i386.c (ix86_expand_int_movcc): In the case where
the comparison directly gives a mask suppress addition when cf is
zero by complementing the mask.
2002-07-16 Nathanael Nerode <neroden@gcc.gnu.org> 2002-07-16 Nathanael Nerode <neroden@gcc.gnu.org>
* Makefile.in: Delete references to enquire. * Makefile.in: Delete references to enquire.

12
gcc/config/i386/i386.c
View File

@ -8666,7 +8666,6 @@ ix86_expand_int_movcc (operands)
if ((compare_code == LTU || compare_code == GEU) if ((compare_code == LTU || compare_code == GEU)
&& !second_test && !bypass_test) && !second_test && !bypass_test)
{ {
/* Detect overlap between destination and compare sources. */ /* Detect overlap between destination and compare sources. */
rtx tmp = out; rtx tmp = out;
@ -8723,7 +8722,7 @@ ix86_expand_int_movcc (operands)
/* /*
* cmpl op0,op1 * cmpl op0,op1
* sbbl dest,dest * sbbl dest,dest
* xorl $-1, dest * notl dest
* [addl dest, cf] * [addl dest, cf]
* *
* Size 8 - 11. * Size 8 - 11.
@ -8739,11 +8738,20 @@ ix86_expand_int_movcc (operands)
/* /*
* cmpl op0,op1 * cmpl op0,op1
* sbbl dest,dest * sbbl dest,dest
* [notl dest]
* andl cf - ct, dest * andl cf - ct, dest
* [addl dest, ct] * [addl dest, ct]
* *
* Size 8 - 11. * Size 8 - 11.
*/ */
if (cf == 0)
{
cf = ct;
ct = 0;
tmp = expand_simple_unop (mode, NOT, tmp, tmp, 1);
}
tmp = expand_simple_binop (mode, AND, tmp = expand_simple_binop (mode, AND,
tmp, tmp,
gen_int_mode (cf - ct, mode), gen_int_mode (cf - ct, mode),