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(jump_optimize): Don't optimize jumps to store-flag insns 

when BLKmode values are being compared.

From-SVN: r2450
This commit is contained in:
Richard Stallman 1992-10-14 04:21:51 +00:00
parent fb3ef382a4
commit 7124e1e508
1 changed files with 8 additions and 0 deletions
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8
gcc/jump.c
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@ -1019,6 +1019,10 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
&& simplejump_p (temp4)
&& JUMP_LABEL (temp4) == JUMP_LABEL (insn)))
&& (temp4 = get_condition (insn, &temp5)) != 0
/* We must be comparing objects whose modes imply the size.
We could handle BLKmode if (1) emit_store_flag could
and (2) we could find the size reliably. */
&& GET_MODE (XEXP (temp4, 0)) != BLKmode
/* If B is zero, OK; if A is zero, can only do (1) if we
can reverse the condition. See if (3) applies possibly
@ -1200,6 +1204,10 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
&& simplejump_p (temp3)
&& JUMP_LABEL (temp3) == JUMP_LABEL (insn)))
&& (temp3 = get_condition (insn, &temp4)) != 0
/* We must be comparing objects whose modes imply the size.
We could handle BLKmode if (1) emit_store_flag could
and (2) we could find the size reliably. */
&& GET_MODE (XEXP (temp3, 0)) != BLKmode
&& can_reverse_comparison_p (temp3, insn))
{
rtx temp6, target = 0, seq, init_insn = 0, init = temp2;