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

(sched_analyze_2): Make volatile asms depend on all 

pseudo registers.

From-SVN: r5621
This commit is contained in:
Jim Wilson 1993-10-05 16:22:04 -07:00
parent 67c8d7deb2
commit df5f5124d5
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
gcc/sched.c
View File

@ -1940,11 +1940,16 @@ sched_analyze_2 (x, insn)
rtx u;
/* Traditional and volatile asm instructions must be considered to use
and clobber all hard registers and all of memory. So must
TRAP_IF and UNSPEC_VOLATILE operations. */
and clobber all hard registers, all pseudo-registers and all of
memory. So must TRAP_IF and UNSPEC_VOLATILE operations.
Consider for instance a volatile asm that changes the fpu rounding
mode. An insn should not be moved across this even if it only uses
pseudo-regs because it might give an incorrectly rounded result. */
if (code != ASM_OPERANDS || MEM_VOLATILE_P (x))
{
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
int max_reg = max_reg_num ();
for (i = 0; i < max_reg; i++)
{
for (u = reg_last_uses[i]; u; u = XEXP (u, 1))
add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);