[committed][RISC-V] Fix RISC-V test expectation after recent saturation/clamping work

[Jeff Law]

Some of the recent work recognizing saturating the clamping resulted in 
vec_sat_u_sub_trunc-1-u8 starting to fail:

Tests that now fail, but worked before (10 tests):
unix/-march=rv64gc_zba_zbb_zbs_zicond: gcc: 
gcc.target/riscv/rvv/autovec/sat/vec_sat_u_sub_trunc-1-u8.c 
-ftree-vectorize -O2 -mrvv-vector-bits=scalable -mrvv-max-lmul=dynamic 
-ffast-math  scan-tree-dump-times optimized ".SAT_SUB " 1
[ ... ]


I bisected and compared the before/after for the identified patch 
(already forgot which patch it was).  The code with the patch was 
clearly better in gimple as it eliminated another branchy sequence and 
replaced it with saturating arithmetic, throwing off the dump check for 
this test.  So the right thing to do is adjust the test expectation.

Interestingly enough this allows us simplify the test expectations as 
the test previously expected different results for -O2 vs -O3.

Pushing to the trunk.

jeffcommit d2e62fc9640620227dbb71955cb428f0ee35bba1
Author: Jeff Law <jeffreya...@gmail.com>
Date:   Sat Sep 19 08:06:13 2026 -0600

    [RISC-V] Fix RISC-V test expectation after recent saturation/clamping work
    
    Some of the recent work recognizing saturating the clamping resulted in
    vec_sat_u_sub_trunc-1-u8 starting to fail:
    
    Tests that now fail, but worked before (10 tests):
    
    unix/-march=rv64gc_zba_zbb_zbs_zicond: gcc: 
gcc.target/riscv/rvv/autovec/sat/vec_sat_u_sub_trunc-1-u8.c -ftree-vectorize 
-O2 -mrvv-vector-bits=scalable -mrvv-max-lmul=dynamic -ffast-math  
scan-tree-dump-times optimized ".SAT_SUB " 1
    [ ... ]
    
    I bisected and compared the before/after for the identified patch (already
    forgot which patch it was).  The code with the patch was clearly better in
    gimple as it eliminated another branchy sequence and replaced it with
    saturating arithmetic, throwing off the dump check for this test.  So the 
right
    thing to do is adjust the test expectation.
    
    Interestingly enough this allows us simplify the test expectations as the 
test
    previously expected different results for -O2 vs -O3.
    
    Pushing to the trunk.
    
    gcc/testsuite
            * gcc.target/riscv/rvv/autovec/sat/vec_sat_u_sub_trunc-1-u8.c: 
Update
            test expectations.

diff --git 
a/gcc/testsuite/gcc.target/riscv/rvv/autovec/sat/vec_sat_u_sub_trunc-1-u8.c 
b/gcc/testsuite/gcc.target/riscv/rvv/autovec/sat/vec_sat_u_sub_trunc-1-u8.c
index c5947d92fe9..b3638bd5d5a 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/autovec/sat/vec_sat_u_sub_trunc-1-u8.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/sat/vec_sat_u_sub_trunc-1-u8.c
@@ -5,7 +5,6 @@
 
 DEF_VEC_SAT_U_SUB_TRUNC_FMT_1(uint8_t, uint16_t)
 
-/* { dg-final { scan-tree-dump-times ".SAT_SUB " 2 "optimized" { target { 
no-opts "-O2" } } } } */
-/* { dg-final { scan-tree-dump-times ".SAT_SUB " 1 "optimized" { target { 
no-opts "-O3" } } } } */
+/* { dg-final { scan-tree-dump-times ".SAT_SUB " 2 "optimized" } } */
 /* { dg-final { scan-assembler-times {vssubu\.vv} 1 } } */
 /* { dg-final { scan-assembler-times {vnsrl\.wi} 1 } } */