--- /dev/null
+++
b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_zbb_run-2.c
@@ -0,0 +1,19 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-march=rv64gcv_zbb --param
riscv-autovec-preference=fixed-vlmax" } */
Could you add compile test (with assembly check) instead of run test ?
If I don't build toolchain with "zbb" then we can't test such issue (VSETVL
BUG).
I may cause regression again if I change VSETVL pass in the future.
[email protected]
From: Robin Dapp
Date: 2023-11-13 18:31
To: [email protected]; gcc-patches; palmer; kito.cheng; jeffreyalaw
CC: rdapp.gcc
Subject: Re: [PATCH] RISC-V: vsetvl: Refine REG_EQUAL equality.
On 11/13/23 10:38, [email protected] wrote:
> For @code{REG_EQUIV}, the register is equivalent to @var{op} throughout
> the entire function, and could validly be replaced in all its
> occurrences by @var{op}. (``Validly'' here refers to the data flow of
> the program; simple replacement may make some insns invalid.) For
> example, when a constant is loaded into a register that is never
> assigned any other value, this kind of note is used.
>
> I think REG_QEUIV is what I want. So I think you can test it to see if there
> is regression on current tests.
Let's keep the REG_EQUAL optimization for later in case we find
a case that triggers it.
Regards
Robin
Subject: [PATCH v2] RISC-V: vsetvl: Refine REG_EQUAL equality.
This patch enhances the equality check for REG_EQUAL notes in the vsetvl
pass by using the == operator instead of rtx_equal_p. With that, in
situations like the following, a5 and a7 are not considered equal
anymore.
(insn 62 60 63 4 (set (reg:DI 17 a7 [orig:154 loop_len_54 ] [154])
(umin:DI (reg:DI 15 a5 [orig:174 _100 ] [174])
(reg:DI 30 t5 [219]))) 442 {umindi3}
(expr_list:REG_EQUAL (umin:DI (reg:DI 15 a5 [orig:174 _100 ] [174])
(const_int 8 [0x8]))
(nil)))
(insn 63 62 65 4 (set (reg:DI 15 a5 [orig:175 _103 ] [175])
(minus:DI (reg:DI 15 a5 [orig:174 _100 ] [174])
(reg:DI 17 a7 [orig:154 loop_len_54 ] [154]))) 11 {subdi3}
(nil))
(insn 65 63 66 4 (set (reg:DI 16 a6 [orig:153 loop_len_53 ] [153])
(umin:DI (reg:DI 15 a5 [orig:175 _103 ] [175])
(reg:DI 30 t5 [219]))) 442 {umindi3}
(expr_list:REG_EQUAL (umin:DI (reg:DI 15 a5 [orig:175 _103 ] [175])
(const_int 8 [0x8]))
(nil)))
gcc/ChangeLog:
* config/riscv/riscv-vsetvl.cc (source_equal_p): Use pointer
equality for REG_EQUAL.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_zbb_run-2.c: New test.
---
gcc/config/riscv/riscv-vsetvl.cc | 12 +++++++++++-
.../partial/multiple_rgroup_zbb_run-2.c | 19 +++++++++++++++++++
2 files changed, 30 insertions(+), 1 deletion(-)
create mode 100644
gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_zbb_run-2.c
diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index 3fa25a6404d..0eea33dd0e1 100644
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -561,7 +561,17 @@ source_equal_p (insn_info *insn1, insn_info *insn2)
rtx note1 = find_reg_equal_equiv_note (rinsn1);
rtx note2 = find_reg_equal_equiv_note (rinsn2);
if (note1 && note2 && rtx_equal_p (note1, note2))
- return true;
+ {
+ /* REG_EQUIVs are invariant at function scope. */
+ if (REG_NOTE_KIND (note2) == REG_EQUIV)
+ return true;
+
+ /* REG_EQUAL are not so in order to consider them similar the RTX they
+ point to must be identical. We could also allow "rtx_equal"
+ REG_EQUALs but would need to check if no insn between them modifies
+ any of their sources. */
+ return note1 == note2;
+ }
return false;
}
diff --git
a/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_zbb_run-2.c
b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_zbb_run-2.c
new file mode 100644
index 00000000000..aeb337dc7ee
--- /dev/null
+++
b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_zbb_run-2.c
@@ -0,0 +1,19 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-march=rv64gcv_zbb --param
riscv-autovec-preference=fixed-vlmax" } */
+
+#include "multiple_rgroup-2.c"
+
+int main (void)
+{
+ TEST_ALL (run_1)
+ TEST_ALL (run_2)
+ TEST_ALL (run_3)
+ TEST_ALL (run_4)
+ TEST_ALL (run_5)
+ TEST_ALL (run_6)
+ TEST_ALL (run_7)
+ TEST_ALL (run_8)
+ TEST_ALL (run_9)
+ TEST_ALL (run_10)
+ return 0;
+}
--
2.41.0
