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expr.c (emit_push_insn): When doing a partial push...

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* expr.c (emit_push_insn): When doing a partial push, emit
        a CLOBBER so that flow doesn't think the entire register
        is live.

From-SVN: r11622
This commit is contained in:
Jeff Law 1996-03-26 08:45:03 -07:00
parent bed95fa1ac
commit 9c7be814e6
1 changed files with 6 additions and 0 deletions
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6
gcc/expr.c
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@ -2350,6 +2350,12 @@ emit_push_insn (x, mode, type, size, align, partial, reg, extra,
Default is below for small data on big-endian machines; else above. */
enum direction where_pad = FUNCTION_ARG_PADDING (mode, type);
/* If we're placing part of X into a register and part of X onto
the stack, indicate that the entire register is clobbered to
keep flow from thinking the unused part of the register is live. */
if (partial)
emit_insn (gen_rtx (CLOBBER, VOIDmode, reg));
/* Invert direction if stack is post-update. */
if (STACK_PUSH_CODE == POST_INC || STACK_PUSH_CODE == POST_DEC)
if (where_pad != none)