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[ARC] Check for odd-even register when emitting double mac ops.

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gcc/
	Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.md (maddsidi4_split): Don't use dmac if the
	destination register is not odd-even.
	(umaddsidi4_split): Likewise.

gcc/testsuite/
	Claudiu Zissulescu  <claziss@synopsys.com>

	* gcc.target/arc/tmac-3.c: New file.

From-SVN: r264736
This commit is contained in:
Claudiu Zissulescu 2018-10-01 11:37:33 +02:00 committed by Claudiu Zissulescu
parent 796a2bb274
commit 97e1d32c5e
4 changed files with 29 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-10-01 Claudiu Zissulescu <claziss@synopsys.com>
* config/arc/arc.md (maddsidi4_split): Don't use dmac if the
destination register is not odd-even.
(umaddsidi4_split): Likewise.
2018-10-01 Richard Biener <rguenther@suse.de>
* tree-inline.c (expand_call_inline): Store origin of fn

4
gcc/config/arc/arc.md
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@ -6309,7 +6309,7 @@ archs4x, archs4xd, archs4xd_slow"
"{
rtx acc_reg = gen_rtx_REG (DImode, ACC_REG_FIRST);
emit_move_insn (acc_reg, operands[3]);
if (TARGET_PLUS_MACD)
if (TARGET_PLUS_MACD && even_register_operand (operands[0], DImode))
emit_insn (gen_macd (operands[0], operands[1], operands[2]));
else
{
@ -6409,7 +6409,7 @@ archs4x, archs4xd, archs4xd_slow"
"{
rtx acc_reg = gen_rtx_REG (DImode, ACC_REG_FIRST);
emit_move_insn (acc_reg, operands[3]);
if (TARGET_PLUS_MACD)
if (TARGET_PLUS_MACD && even_register_operand (operands[0], DImode))
emit_insn (gen_macdu (operands[0], operands[1], operands[2]));
else
{

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2018-10-01 Claudiu Zissulescu <claziss@synopsys.com>
* gcc.target/arc/tmac-3.c: New file.
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/87359

17
gcc/testsuite/gcc.target/arc/tmac-3.c Normal file
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@ -0,0 +1,17 @@
/* { dg-do compile } */
/* { dg-skip-if "" { ! { clmcpu } } } */
/* { dg-options "-mcpu=hs38 -Os" } */
/* The compiler will assign r1r2 as a DI register, but it doesn't fit
the macd operation, hence we need to fall back on the mac
instruction. */
typedef long long myint64_t;
extern int d (int, myint64_t);
int b (int c)
{
int x = (int) d;
d (c, (myint64_t)x * 2 + 1);
}
/* { dg-final { scan-assembler "mac\\\s+r1" } } */