OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Do not fold constant comparisons

Browse Source 
From-SVN: r2136
This commit is contained in:
Michael Meissner 1992-09-16 18:52:31 +00:00
parent fcc415d459
commit 4debb28042
2 changed files with 1 additions and 84 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
gcc/config/mips/mips.c
View File

@ -1531,8 +1531,6 @@ map_test_to_internal_test (test_code)
/* Generate the code to compare two integer values. The return value is:
(reg:SI xx) The pseudo register the comparison is in
(const_int 0) The comparison is always false
(const_int 1) The comparison is always true
(rtx)0 No register, generate a simple branch. */
rtx
@ -1583,52 +1581,6 @@ gen_int_relational (test_code, result, cmp0, cmp1, p_invert)
p_info = &info[ (int)test ];
eqne_p = (p_info->test_code == XOR);
/* See if the test is always true or false. */
if ((GET_CODE (cmp0) == REG || GET_CODE (cmp0) == SUBREG)
&& GET_CODE (cmp1) == CONST_INT)
{
HOST_WIDE_INT value = INTVAL (cmp1);
rtx truth = (rtx)0;
if (test == ITEST_GEU && value == 0)
truth = const1_rtx;
else if (test == ITEST_LTU && value == 0)
truth = const0_rtx;
else if (!TARGET_INT64)
{
if (test == ITEST_LTU && value == -1)
truth = const1_rtx;
else if (test == ITEST_GTU && value == -1)
truth = const0_rtx;
else if (test == ITEST_LEU && value == -1)
truth = const1_rtx;
else if (test == ITEST_GT && value == 0x7fffffff)
truth = const0_rtx;
else if (test == ITEST_LE && value == 0x7fffffff)
truth = const1_rtx;
else if (test == ITEST_LT && value == 0x80000000)
truth = const0_rtx;
else if (test == ITEST_GE && value == 0x80000000)
truth = const1_rtx;
}
if (truth != (rtx)0)
{
if (result != (rtx)0)
emit_move_insn (result, truth);
return truth;
}
}
/* Eliminate simple branches */
branch_p = (result == (rtx)0);
if (branch_p)
@ -1813,41 +1765,6 @@ gen_conditional_branch (operands, test_code)
break;
}
/* Handle always true or always false cases directly */
if (GET_CODE (cmp0) == CONST_INT && GET_CODE (cmp1) == CONST_INT)
{
HOST_WIDE_INT sval0 = INTVAL (cmp0);
HOST_WIDE_INT sval1 = INTVAL (cmp1);
unsigned long uval0 = sval0;
unsigned long uval1 = sval1;
int truth = 0;
switch (test_code)
{
default:
goto fail;
case EQ: truth = (sval0 == sval1); break;
case NE: truth = (sval0 != sval1); break;
case GT: truth = (sval0 > sval1); break;
case GE: truth = (sval0 >= sval1); break;
case LT: truth = (sval0 < sval1); break;
case LE: truth = (sval0 <= sval1); break;
case GTU: truth = (uval0 > uval1); break;
case GEU: truth = (uval0 >= uval1); break;
case LTU: truth = (uval0 < uval1); break;
case LEU: truth = (uval0 <= uval1); break;
}
if (invert)
truth = ! truth;
if (truth)
emit_jump_insn (gen_rtx (SET, VOIDmode, pc_rtx, label1));
return;
}
/* Generate the jump */
if (invert)
{

2
gcc/config/mips/mips.h
View File

@ -473,7 +473,7 @@ while (0)
/* Print subsidiary information on the compiler version in use. */
#define MIPS_VERSION "[AL 1.1, MM 24]"
#define MIPS_VERSION "[AL 1.1, MM 25]"
#ifndef MACHINE_TYPE
#define MACHINE_TYPE "BSD Mips"