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* [gcc r14-10014] AArch64: remove reliance on register allocator for simd/gpreg costing. [PR114741]
@ 2024-04-18 10:49 Tamar Christina
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From: Tamar Christina @ 2024-04-18 10:49 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:a2f4be3dae04fa8606d1cc8451f0b9d450f7e6e6
commit r14-10014-ga2f4be3dae04fa8606d1cc8451f0b9d450f7e6e6
Author: Tamar Christina <tamar.christina@arm.com>
Date: Thu Apr 18 11:47:42 2024 +0100
AArch64: remove reliance on register allocator for simd/gpreg costing. [PR114741]
In PR114741 we see that we have a regression in codegen when SVE is enable where
the simple testcase:
void foo(unsigned v, unsigned *p)
{
*p = v & 1;
}
generates
foo:
fmov s31, w0
and z31.s, z31.s, #1
str s31, [x1]
ret
instead of:
foo:
and w0, w0, 1
str w0, [x1]
ret
This causes an impact it not just codesize but also performance. This is caused
by the use of the ^ constraint modifier in the pattern <optab><mode>3.
The documentation states that this modifier should only have an effect on the
alternative costing in that a particular alternative is to be preferred unless
a non-psuedo reload is needed.
The pattern was trying to convey that whenever both r and w are required, that
it should prefer r unless a reload is needed. This is because if a reload is
needed then we can construct the constants more flexibly on the SIMD side.
We were using this so simplify the implementation and to get generic cases such
as:
double negabs (double x)
{
unsigned long long y;
memcpy (&y, &x, sizeof(double));
y = y | (1UL << 63);
memcpy (&x, &y, sizeof(double));
return x;
}
which don't go through an expander.
However the implementation of ^ in the register allocator is not according to
the documentation in that it also has an effect during coloring. During initial
register class selection it applies a penalty to a class, similar to how ? does.
In this example the penalty makes the use of GP regs expensive enough that it no
longer considers them:
r106: preferred FP_REGS, alternative NO_REGS, allocno FP_REGS
;; 3--> b 0: i 9 r106=r105&0x1
:cortex_a53_slot_any:GENERAL_REGS+0(-1)FP_REGS+1(1)PR_LO_REGS+0(0)
PR_HI_REGS+0(0):model 4
which is not the expected behavior. For GCC 14 this is a conservative fix.
1. we remove the ^ modifier from the logical optabs.
2. In order not to regress copysign we then move the copysign expansion to
directly use the SIMD variant. Since copysign only supports floating point
modes this is fine and no longer relies on the register allocator to select
the right alternative.
It once again regresses the general case, but this case wasn't optimized in
earlier GCCs either so it's not a regression in GCC 14. This change gives
strict better codegen than earlier GCCs and still optimizes the important cases.
gcc/ChangeLog:
PR target/114741
* config/aarch64/aarch64.md (<optab><mode>3): Remove ^ from alt 2.
(copysign<GPF:mode>3): Use SIMD version of IOR directly.
gcc/testsuite/ChangeLog:
PR target/114741
* gcc.target/aarch64/fneg-abs_2.c: Update codegen.
* gcc.target/aarch64/fneg-abs_4.c: xfail for now.
* gcc.target/aarch64/pr114741.c: New test.
Diff:
---
gcc/config/aarch64/aarch64.md | 23 +++++++++++++--------
gcc/testsuite/gcc.target/aarch64/fneg-abs_2.c | 5 ++---
gcc/testsuite/gcc.target/aarch64/fneg-abs_4.c | 4 ++--
gcc/testsuite/gcc.target/aarch64/pr114741.c | 29 +++++++++++++++++++++++++++
4 files changed, 48 insertions(+), 13 deletions(-)
diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index 385a669b9b3..dbde066f747 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -4811,7 +4811,7 @@
""
{@ [ cons: =0 , 1 , 2 ; attrs: type , arch ]
[ r , %r , r ; logic_reg , * ] <logical>\t%<w>0, %<w>1, %<w>2
- [ rk , ^r , <lconst> ; logic_imm , * ] <logical>\t%<w>0, %<w>1, %2
+ [ rk , r , <lconst> ; logic_imm , * ] <logical>\t%<w>0, %<w>1, %2
[ w , 0 , <lconst> ; * , sve ] <logical>\t%Z0.<s>, %Z0.<s>, #%2
[ w , w , w ; neon_logic , simd ] <logical>\t%0.<Vbtype>, %1.<Vbtype>, %2.<Vbtype>
}
@@ -7192,22 +7192,29 @@
(match_operand:GPF 2 "nonmemory_operand")]
"TARGET_SIMD"
{
- machine_mode int_mode = <V_INT_EQUIV>mode;
- rtx bitmask = gen_reg_rtx (int_mode);
- emit_move_insn (bitmask, GEN_INT (HOST_WIDE_INT_M1U
- << (GET_MODE_BITSIZE (<MODE>mode) - 1)));
+ rtx signbit_const = GEN_INT (HOST_WIDE_INT_M1U
+ << (GET_MODE_BITSIZE (<MODE>mode) - 1));
/* copysign (x, -1) should instead be expanded as orr with the sign
bit. */
rtx op2_elt = unwrap_const_vec_duplicate (operands[2]);
if (GET_CODE (op2_elt) == CONST_DOUBLE
&& real_isneg (CONST_DOUBLE_REAL_VALUE (op2_elt)))
{
- emit_insn (gen_ior<v_int_equiv>3 (
- lowpart_subreg (int_mode, operands[0], <MODE>mode),
- lowpart_subreg (int_mode, operands[1], <MODE>mode), bitmask));
+ rtx v_bitmask
+ = force_reg (V2<V_INT_EQUIV>mode,
+ gen_const_vec_duplicate (V2<V_INT_EQUIV>mode,
+ signbit_const));
+
+ emit_insn (gen_iorv2<v_int_equiv>3 (
+ lowpart_subreg (V2<V_INT_EQUIV>mode, operands[0], <MODE>mode),
+ lowpart_subreg (V2<V_INT_EQUIV>mode, operands[1], <MODE>mode),
+ v_bitmask));
DONE;
}
+ machine_mode int_mode = <V_INT_EQUIV>mode;
+ rtx bitmask = gen_reg_rtx (int_mode);
+ emit_move_insn (bitmask, signbit_const);
operands[2] = force_reg (<MODE>mode, operands[2]);
emit_insn (gen_copysign<mode>3_insn (operands[0], operands[1], operands[2],
bitmask));
diff --git a/gcc/testsuite/gcc.target/aarch64/fneg-abs_2.c b/gcc/testsuite/gcc.target/aarch64/fneg-abs_2.c
index eed41ea18e6..18d10ee834d 100644
--- a/gcc/testsuite/gcc.target/aarch64/fneg-abs_2.c
+++ b/gcc/testsuite/gcc.target/aarch64/fneg-abs_2.c
@@ -9,8 +9,7 @@
/*
** f1:
-** movi v[0-9]+.2s, 0x80, lsl 24
-** orr v[0-9]+.8b, v[0-9]+.8b, v[0-9]+.8b
+** orr v[0-9]+.2s, #?128, lsl #?24
** ret
*/
float32_t f1 (float32_t a)
@@ -22,7 +21,7 @@ float32_t f1 (float32_t a)
** f2:
** movi v[0-9]+.4s, #?0
** fneg v[0-9]+.2d, v[0-9]+.2d
-** orr v[0-9]+.8b, v[0-9]+.8b, v[0-9]+.8b
+** orr v[0-9]+.16b, v[0-9]+.16b, v[0-9]+.16b
** ret
*/
float64_t f2 (float64_t a)
diff --git a/gcc/testsuite/gcc.target/aarch64/fneg-abs_4.c b/gcc/testsuite/gcc.target/aarch64/fneg-abs_4.c
index d45c3d1210c..6da95a4b052 100644
--- a/gcc/testsuite/gcc.target/aarch64/fneg-abs_4.c
+++ b/gcc/testsuite/gcc.target/aarch64/fneg-abs_4.c
@@ -7,7 +7,7 @@
#include <string.h>
/*
-** negabs:
+** negabs: { xfail *-*-* }
** movi v31.4s, #?0
** fneg v[0-9]+.2d, v[0-9]+.2d
** orr v[0-9]+.8b, v[0-9]+.8b, v[0-9]+.8b
@@ -23,7 +23,7 @@ double negabs (double x)
}
/*
-** negabsf:
+** negabsf: { xfail *-*-* }
** movi v[0-9]+.2s, 0x80, lsl 24
** orr v[0-9]+.8b, v[0-9]+.8b, v[0-9]+.8b
** ret
diff --git a/gcc/testsuite/gcc.target/aarch64/pr114741.c b/gcc/testsuite/gcc.target/aarch64/pr114741.c
new file mode 100644
index 00000000000..fd2182da0e9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/pr114741.c
@@ -0,0 +1,29 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { check-function-bodies "**" "" "" { target lp64 } } } */
+
+#pragma GCC target "+nosve"
+
+/*
+** foo1:
+** and w0, w0, 1
+** str w0, \[x1\]
+** ret
+*/
+void foo1(unsigned v, unsigned *p)
+{
+ *p = v & 1;
+}
+
+#pragma GCC target "+sve"
+
+/*
+** foo2:
+** and w0, w0, 1
+** str w0, \[x1\]
+** ret
+*/
+void foo2(unsigned v, unsigned *p)
+{
+ *p = v & 1;
+}
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