[gcc r14-8329] RISC-V: Fix vfirst/vmsbf/vmsif/vmsof ratio attributes

[Pan Li <panli@gcc.gnu.org>]

https://gcc.gnu.org/g:a618b3c65745a6992ced4df60c186241c2da6eae

commit r14-8329-ga618b3c65745a6992ced4df60c186241c2da6eae
Author: Juzhe-Zhong <juzhe.zhong@rivai.ai>
Date:   Mon Jan 22 10:49:05 2024 +0800

    RISC-V: Fix vfirst/vmsbf/vmsif/vmsof ratio attributes
    
    vfirst/vmsbf/vmsif/vmsof instructions are supposed to demand ratio instead of demanding sew_lmul.
    But my previous typo makes VSETVL PASS miss honor the risc-v v spec.
    
    Consider this following simple case:
    
    int foo4 (void * in, void * out)
    {
      vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
      v = __riscv_vadd_vv_i32m1 (v, v, 4);
      vbool32_t mask = __riscv_vreinterpret_v_i32m1_b32(v);
      mask = __riscv_vmsof_m_b32(mask, 4);
      return __riscv_vfirst_m_b32(mask, 4);
    }
    
    Before this patch:
    
    foo4:
            vsetivli        zero,4,e32,m1,ta,ma
            vle32.v v1,0(a0)
            vadd.vv v1,v1,v1
            vsetvli zero,zero,e8,mf4,ta,ma    ----> redundant.
            vmsof.m v2,v1
            vfirst.m        a0,v2
            ret
    
    After this patch:
    
    foo4:
            vsetivli        zero,4,e32,m1,ta,ma
            vle32.v v1,0(a0)
            vadd.vv v1,v1,v1
            vmsof.m v2,v1
            vfirst.m        a0,v2
            ret
    
    Confirm RVV spec and Clang, this patch makes VSETVL PASS match the correct behavior.
    
    Tested on both RV32/RV64, no regression.
    
    gcc/ChangeLog:
    
            * config/riscv/vector.md: Fix vfirst/vmsbf/vmsof ratio attributes.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/riscv/rvv/vsetvl/attribute-1.c: New test.

Diff:
---
 gcc/config/riscv/vector.md                         |  2 +-
 .../gcc.target/riscv/rvv/vsetvl/attribute-1.c      | 47 ++++++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/gcc/config/riscv/vector.md b/gcc/config/riscv/vector.md
index cfc54ae5eac..307d9a8c952 100644
--- a/gcc/config/riscv/vector.md
+++ b/gcc/config/riscv/vector.md
@@ -433,7 +433,7 @@
 			  vialu,vshift,vicmp,vimul,vidiv,vsalu,\
 			  vext,viwalu,viwmul,vicalu,vnshift,\
 			  vimuladd,vimerge,vaalu,vsmul,vsshift,\
-			  vnclip,viminmax,viwmuladd,vmffs,vmsfs,\
+			  vnclip,viminmax,viwmuladd,\
 			  vmiota,vmidx,vfalu,vfmul,vfminmax,vfdiv,\
 			  vfwalu,vfwmul,vfsqrt,vfrecp,vfsgnj,vfcmp,\
 			  vfmerge,vfcvtitof,vfcvtftoi,vfwcvtitof,\
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/vsetvl/attribute-1.c b/gcc/testsuite/gcc.target/riscv/rvv/vsetvl/attribute-1.c
new file mode 100644
index 00000000000..28dcf986bac
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/vsetvl/attribute-1.c
@@ -0,0 +1,47 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv -mabi=lp64d -O3" } */
+
+#include "riscv_vector.h"
+
+int
+foo (void *in, void *out)
+{
+  vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
+  v = __riscv_vadd_vv_i32m1 (v, v, 4);
+  vbool32_t mask = __riscv_vreinterpret_v_i32m1_b32 (v);
+  return __riscv_vfirst_m_b32 (mask, 4);
+}
+
+int
+foo2 (void *in, void *out)
+{
+  vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
+  v = __riscv_vadd_vv_i32m1 (v, v, 4);
+  vbool32_t mask = __riscv_vreinterpret_v_i32m1_b32 (v);
+  mask = __riscv_vmsbf_m_b32 (mask, 4);
+  return __riscv_vfirst_m_b32 (mask, 4);
+}
+
+int
+foo3 (void *in, void *out)
+{
+  vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
+  v = __riscv_vadd_vv_i32m1 (v, v, 4);
+  vbool32_t mask = __riscv_vreinterpret_v_i32m1_b32 (v);
+  mask = __riscv_vmsif_m_b32 (mask, 4);
+  return __riscv_vfirst_m_b32 (mask, 4);
+}
+
+int
+foo4 (void *in, void *out)
+{
+  vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
+  v = __riscv_vadd_vv_i32m1 (v, v, 4);
+  vbool32_t mask = __riscv_vreinterpret_v_i32m1_b32 (v);
+  mask = __riscv_vmsof_m_b32 (mask, 4);
+  return __riscv_vfirst_m_b32 (mask, 4);
+}
+
+/* { dg-final { scan-assembler-times {vsetivli\s+zero,\s*4,\s*e32,\s*m1,\s*t[au],\s*m[au]} 4 } } */
+/* { dg-final { scan-assembler-times {vsetivli} 4 } } */
+/* { dg-final { scan-assembler-not {vsetvli} } } */