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rs6000: r12 copy cleanup

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Remove unnecessary tests before copying function address to r12.

2020-08-28  Bill Schmidt  <wschmidt@linux.ibm.com>

gcc/
	* config/rs6000/rs6000.c (rs6000_call_aix): Remove test for r12.
	(rs6000_sibcall_aix): Likewise.
This commit is contained in:
Bill Schmidt 2020-08-28 11:47:01 -05:00
parent 1c1e41b065
commit 26c24398d3
1 changed files with 2 additions and 4 deletions
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6
gcc/config/rs6000/rs6000.c
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@ -24725,8 +24725,7 @@ rs6000_call_aix (rtx value, rtx func_desc, rtx tlsarg, rtx cookie)
/* A function pointer in the ELFv2 ABI is just a plain address, but
the ABI requires it to be loaded into r12 before the call. */
func_addr = gen_rtx_REG (Pmode, 12);
if (!rtx_equal_p (func_addr, func))
emit_move_insn (func_addr, func);
emit_move_insn (func_addr, func);
abi_reg = func_addr;
/* Indirect calls via CTR are strongly preferred over indirect
calls via LR, so move the address there. Needed to mark
@ -24846,8 +24845,7 @@ rs6000_sibcall_aix (rtx value, rtx func_desc, rtx tlsarg, rtx cookie)
if (GET_CODE (func_desc) != SYMBOL_REF && DEFAULT_ABI == ABI_ELFv2)
{
r12 = gen_rtx_REG (Pmode, 12);
if (!rtx_equal_p (r12, func_desc))
emit_move_insn (r12, func_desc);
emit_move_insn (r12, func_desc);
func_addr = gen_rtx_REG (Pmode, CTR_REGNO);
emit_move_insn (func_addr, r12);
}