This issue happens is because the operand1 of scalar move can be
REG_P (operand[1]) in the O0 case, which causes the VSETVL PASS to
not insert the vsetvl instruction correctly, and the compiler crashes.
Consider this following case:
int16_t foo1 (void *base, size_t vl)
{
int16_t maxVal = __riscv_vmv_x_s_i16m1_i16 (__riscv_vle16_v_i16m1 (base,
vl));
return maxVal;
}
Before this patch:
bug.c:15:1: internal compiler error: Segmentation fault
15 | }
| ^
0x145d723 crash_signal
../.././riscv-gcc/gcc/toplev.cc:314
0x22929dd const_csr_operand(rtx_def*, machine_mode)
../.././riscv-gcc/gcc/config/riscv/predicates.md:44
0x2292a21 csr_operand(rtx_def*, machine_mode)
../.././riscv-gcc/gcc/config/riscv/predicates.md:46
0x23dfbb0 recog_356
../.././riscv-gcc/gcc/config/riscv/iterators.md:72
0x23efecd recog(rtx_def*, rtx_insn*, int*)
../.././riscv-gcc/gcc/config/riscv/iterators.md:89
0xdddc15 recog_memoized(rtx_insn*)
../.././riscv-gcc/gcc/recog.h:273
After this patch:
vsetivli zero,0,e16,m1,ta,ma
vmv.x.s a5,v1
gcc/ChangeLog:
* config/riscv/riscv-vsetvl.cc (gen_vsetvl_pat): For vfmv.f.s/vmv.x.s
intruction replace null avl with (const_int 0).
gcc/testsuite/ChangeLog:
* gcc.target/riscv/rvv/base/scalar_move-10.c: New test.
* gcc.target/riscv/rvv/base/scalar_move-11.c: New test.
---
gcc/config/riscv/riscv-vsetvl.cc | 5 +++
.../riscv/rvv/base/scalar_move-10.c | 31 +++++++++++++++++++
.../riscv/rvv/base/scalar_move-11.c | 20 ++++++++++++
3 files changed, 56 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-10.c
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-11.c
diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index d4d6f336ef9..14ebae1f3f6 100644
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -618,6 +618,11 @@ static rtx
gen_vsetvl_pat (enum vsetvl_type insn_type, const vl_vtype_info &info, rtx vl)
{
rtx avl = info.get_avl ();
+ /* if optimization == 0 and the instruction is vmv.x.s/vfmv.f.s,
+ set the value of avl to (const_int 0) so that VSETVL PASS will
+ insert vsetvl correctly.*/
+ if (info.has_avl_no_reg ())
+ avl = GEN_INT (0);
rtx sew = gen_int_mode (info.get_sew (), Pmode);
rtx vlmul = gen_int_mode (info.get_vlmul (), Pmode);
rtx ta = gen_int_mode (info.get_ta (), Pmode);
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-10.c
b/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-10.c
new file mode 100644
index 00000000000..9760d77fb22
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-10.c
@@ -0,0 +1,31 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv -mabi=lp64d -O0" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "riscv_vector.h"
+
+/*
+** foo1:
+** ...
+** vsetivli\tzero,0,e16,m1,t[au],m[au]
+** vmv.x.s\t[a-x0-9]+,v[0-9]+
+** ...
+*/
+int16_t foo1 (void *base, size_t vl)
+{
+ int16_t maxVal = __riscv_vmv_x_s_i16m1_i16 (__riscv_vle16_v_i16m1 (base,
vl));
+ return maxVal;
+}
+
+/*
+** foo2:
+** ...
+** vsetivli\tzero,0,e32,m1,t[au],m[au]
+** vfmv.f.s\tf[a-x0-9]+,v[0-9]+
+** ...
+*/
+float foo2 (void *base, size_t vl)
+{
+ float maxVal = __riscv_vfmv_f_s_f32m1_f32 (__riscv_vle32_v_f32m1 (base,
vl));
+ return maxVal;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-11.c
b/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-11.c
new file mode 100644
index 00000000000..8036acd0a52
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-11.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gcv -mabi=ilp32d -O0" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "riscv_vector.h"
+
+/*
+** foo:
+** ...
+** vsetivli\tzero,0,e64,m4,t[au],m[au]
+** vmv.x.s\t[a-x0-9]+,v[0-9]+
+** vsetivli\tzero,0,e64,m4,t[au],m[au]
+** vmv.x.s\t[a-x0-9]+,v[0-9]+
+** ...
+*/
+int16_t foo (void *base, size_t vl)
+{
+ int16_t maxVal = __riscv_vmv_x_s_i64m4_i64 (__riscv_vle64_v_i64m4 (base,
vl));
+ return maxVal;
+}
--
2.17.1
