[PATCH] RISC-V: Add RISC-V into vect_cmdline_needed

[PATCH] RISC-V: Add RISC-V into vect_cmdline_needed

[Juzhe-Zhong]

Like all other targets, we add RISC-V into vect_cmdline_needed.

This patch fixes following FAILs:

FAIL: gcc.dg/tree-ssa/gen-vect-11b.c scan-tree-dump-times vect "vectorized 0 loops" 1
FAIL: gcc.dg/tree-ssa/gen-vect-11c.c scan-tree-dump-times vect "vectorized 0 loops" 1
FAIL: gcc.dg/tree-ssa/gen-vect-26.c scan-tree-dump-times vect "Alignment of access forced using peeling" 1
FAIL: gcc.dg/tree-ssa/gen-vect-28.c scan-tree-dump-times vect "Alignment of access forced using peeling" 1

gcc/testsuite/ChangeLog:

	* lib/target-supports.exp: Add RISC-V.

---
 gcc/testsuite/lib/target-supports.exp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 17a87db0007..285817ef16e 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -4036,7 +4036,8 @@ proc check_effective_target_vect_cmdline_needed { } {
 	     || ([istarget sparc*-*-*] && [check_effective_target_sparc_vis])
 	     || ([istarget arm*-*-*] && [check_effective_target_arm_neon])
 	     || [istarget aarch64*-*-*]
-             || [istarget amdgcn*-*-*]} {
+	     || [istarget amdgcn*-*-*]
+	     || [istarget riscv*-*-*]} {
 	    return 0
 	} else {
 	    return 1
-- 
2.36.3

Re: [PATCH] RISC-V: Add RISC-V into vect_cmdline_needed

[Robin Dapp]

Looks OK but I don't really get the test (e.g. gen-vect-26.c).  It is
only ran if target vect_cmdline_needed, otherwise compiled?  Why does
that have an impact on the scan?  Looks weird but well...

Regards
 Robin

Re: Re: [PATCH] RISC-V: Add RISC-V into vect_cmdline_needed

[juzhe.zhong]

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It need command line to enable SIMD auto-vectorization (VLS mode in RVV).
It will enable VLS modes auto-vectorization by default if we didn't add RISCV into vect_cmdline.
So adding it to disable VLS mode vectorization which will fix the FAILs like other targets.



juzhe.zhong@rivai.ai
 
From: Robin Dapp
Date: 2023-11-07 20:04
To: Juzhe-Zhong; gcc-patches
CC: rdapp.gcc; kito.cheng; kito.cheng; jeffreyalaw
Subject: Re: [PATCH] RISC-V: Add RISC-V into vect_cmdline_needed
Looks OK but I don't really get the test (e.g. gen-vect-26.c).  It is
only ran if target vect_cmdline_needed, otherwise compiled?  Why does
that have an impact on the scan?  Looks weird but well...
 
Regards
Robin
 

Re: [PATCH] RISC-V: Add RISC-V into vect_cmdline_needed

[Robin Dapp]

> It need command line to enable SIMD auto-vectorization (VLS mode in RVV).
> It will enable VLS modes auto-vectorization by default if we didn't add RISCV into vect_cmdline.
> So adding it to disable VLS mode vectorization which will fix the FAILs like other targets.

Ah so it's about SIMD despite the name, I see.  Still weird
but adding riscv then makes sense.  So OK.  The test probably
just very old.

Regards
 Robin

Re: Re: [PATCH] RISC-V: Add RISC-V into vect_cmdline_needed

[juzhe.zhong]

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Thanks. Committed.



juzhe.zhong@rivai.ai
 
From: Robin Dapp
Date: 2023-11-07 20:10
To: juzhe.zhong@rivai.ai; gcc-patches
CC: rdapp.gcc; kito.cheng; Kito.cheng; jeffreyalaw
Subject: Re: [PATCH] RISC-V: Add RISC-V into vect_cmdline_needed
> It need command line to enable SIMD auto-vectorization (VLS mode in RVV).
> It will enable VLS modes auto-vectorization by default if we didn't add RISCV into vect_cmdline.
> So adding it to disable VLS mode vectorization which will fix the FAILs like other targets.
 
Ah so it's about SIMD despite the name, I see.  Still weird
but adding riscv then makes sense.  So OK.  The test probably
just very old.
 
Regards
Robin