RE: Re: [PATCH] RISC-V: Disallow RVV mode address for any load/store[PR112535]
Committed, thanks Kito. Pan -Original Message- From: Kito Cheng Sent: Wednesday, November 15, 2023 3:36 PM To: juzhe.zh...@rivai.ai Cc: Kito.cheng ; gcc-patches ; jeffreyalaw ; Robin Dapp Subject: Re: Re: [PATCH] RISC-V: Disallow RVV mode address for any load/store[PR112535] LGTM, and yeah, I agree that's a code model issue. On Wed, Nov 15, 2023 at 3:29 PM juzhe.zh...@rivai.ai wrote: > > Yes. > (set (reg:DI) (subreg:DI (reg:V1DI 155) 0)) become vmv.x.s > > So, you will see: > vsetivli zero,1,e64,m1,ta,ma > sb zero,%lo(c)(a2) > vle64.v v1,0(a5) > lbu a5,%lo(b)(a4) > vse64.v v1,0(a3) > beq a5,zero,.L6 > vmv.x.s a5,v1 > sw zero,0(a5) > > I think the codegen is not good. It should be using scalar load/store. > I think it should be COST MODEL issue. > > > juzhe.zh...@rivai.ai > > > From: Kito Cheng > Date: 2023-11-15 15:24 > To: Juzhe-Zhong > CC: gcc-patches; kito.cheng; jeffreyalaw; rdapp.gcc > Subject: Re: [PATCH] RISC-V: Disallow RVV mode address for any > load/store[PR112535] > Curious about the code gen impact, does it make IRA/LRA insert one more move > like (set (reg:DI) (subreg:DI (reg:V1DI 155) 0)) and then (set (mem:SI > (reg:DI)) (const_int 0))? > > On Wed, Nov 15, 2023 at 3:15 PM Juzhe-Zhong wrote: >> >> This patch is quite obvious patch which disallow for load/store address >> register >> with RVV mode. >> >> PR target/112535 >> >> gcc/ChangeLog: >> >> * config/riscv/riscv.cc (riscv_legitimate_address_p): Disallow RVV >> modes base address. >> >> gcc/testsuite/ChangeLog: >> >> * gcc.target/riscv/rvv/autovec/pr112535.c: New test. >> >> --- >> gcc/config/riscv/riscv.cc | 4 >> .../gcc.target/riscv/rvv/autovec/pr112535.c | 17 + >> 2 files changed, 21 insertions(+) >> create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c >> >> diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc >> index ecee7eb4727..e919850fc6c 100644 >> --- a/gcc/config/riscv/riscv.cc >> +++ b/gcc/config/riscv/riscv.cc >> @@ -1427,6 +1427,10 @@ static bool >> riscv_legitimate_address_p (machine_mode mode, rtx x, bool strict_p, >> code_helper = ERROR_MARK) >> { >> + /* Disallow RVV modes base address. >> + E.g. (mem:SI (subreg:DI (reg:V1DI 155) 0). */ >> + if (SUBREG_P (x) && riscv_v_ext_mode_p (GET_MODE (SUBREG_REG (x >> +return false; >>struct riscv_address_info addr; >> >>return riscv_classify_address (, x, mode, strict_p); >> diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c >> b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c >> new file mode 100644 >> index 000..95799aab8d2 >> --- /dev/null >> +++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c >> @@ -0,0 +1,17 @@ >> +/* { dg-do compile } */ >> +/* { dg-options "-march=rv64gcv -mabi=lp64d -O3" } */ >> + >> +int *a, *f; >> +char b, c; >> +int ***d; >> +static int e = >> +void g() { >> + c = 3; >> + for (; c; c--) >> +if (c < 8) { >> + f = 0; >> + ***e = a; >> +} >> + if (b) >> +***d = 0; >> +} >> -- >> 2.36.3 >>
Re: Re: [PATCH] RISC-V: Disallow RVV mode address for any load/store[PR112535]
LGTM, and yeah, I agree that's a code model issue. On Wed, Nov 15, 2023 at 3:29 PM juzhe.zh...@rivai.ai wrote: > > Yes. > (set (reg:DI) (subreg:DI (reg:V1DI 155) 0)) become vmv.x.s > > So, you will see: > vsetivli zero,1,e64,m1,ta,ma > sb zero,%lo(c)(a2) > vle64.v v1,0(a5) > lbu a5,%lo(b)(a4) > vse64.v v1,0(a3) > beq a5,zero,.L6 > vmv.x.s a5,v1 > sw zero,0(a5) > > I think the codegen is not good. It should be using scalar load/store. > I think it should be COST MODEL issue. > > > juzhe.zh...@rivai.ai > > > From: Kito Cheng > Date: 2023-11-15 15:24 > To: Juzhe-Zhong > CC: gcc-patches; kito.cheng; jeffreyalaw; rdapp.gcc > Subject: Re: [PATCH] RISC-V: Disallow RVV mode address for any > load/store[PR112535] > Curious about the code gen impact, does it make IRA/LRA insert one more move > like (set (reg:DI) (subreg:DI (reg:V1DI 155) 0)) and then (set (mem:SI > (reg:DI)) (const_int 0))? > > On Wed, Nov 15, 2023 at 3:15 PM Juzhe-Zhong wrote: >> >> This patch is quite obvious patch which disallow for load/store address >> register >> with RVV mode. >> >> PR target/112535 >> >> gcc/ChangeLog: >> >> * config/riscv/riscv.cc (riscv_legitimate_address_p): Disallow RVV >> modes base address. >> >> gcc/testsuite/ChangeLog: >> >> * gcc.target/riscv/rvv/autovec/pr112535.c: New test. >> >> --- >> gcc/config/riscv/riscv.cc | 4 >> .../gcc.target/riscv/rvv/autovec/pr112535.c | 17 + >> 2 files changed, 21 insertions(+) >> create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c >> >> diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc >> index ecee7eb4727..e919850fc6c 100644 >> --- a/gcc/config/riscv/riscv.cc >> +++ b/gcc/config/riscv/riscv.cc >> @@ -1427,6 +1427,10 @@ static bool >> riscv_legitimate_address_p (machine_mode mode, rtx x, bool strict_p, >> code_helper = ERROR_MARK) >> { >> + /* Disallow RVV modes base address. >> + E.g. (mem:SI (subreg:DI (reg:V1DI 155) 0). */ >> + if (SUBREG_P (x) && riscv_v_ext_mode_p (GET_MODE (SUBREG_REG (x >> +return false; >>struct riscv_address_info addr; >> >>return riscv_classify_address (, x, mode, strict_p); >> diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c >> b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c >> new file mode 100644 >> index 000..95799aab8d2 >> --- /dev/null >> +++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c >> @@ -0,0 +1,17 @@ >> +/* { dg-do compile } */ >> +/* { dg-options "-march=rv64gcv -mabi=lp64d -O3" } */ >> + >> +int *a, *f; >> +char b, c; >> +int ***d; >> +static int e = >> +void g() { >> + c = 3; >> + for (; c; c--) >> +if (c < 8) { >> + f = 0; >> + ***e = a; >> +} >> + if (b) >> +***d = 0; >> +} >> -- >> 2.36.3 >>
Re: Re: [PATCH] RISC-V: Disallow RVV mode address for any load/store[PR112535]
Yes. (set (reg:DI) (subreg:DI (reg:V1DI 155) 0)) become vmv.x.s So, you will see: vsetivli zero,1,e64,m1,ta,ma sb zero,%lo(c)(a2) vle64.v v1,0(a5) lbu a5,%lo(b)(a4) vse64.v v1,0(a3) beq a5,zero,.L6 vmv.x.s a5,v1 sw zero,0(a5) I think the codegen is not good. It should be using scalar load/store. I think it should be COST MODEL issue. juzhe.zh...@rivai.ai From: Kito Cheng Date: 2023-11-15 15:24 To: Juzhe-Zhong CC: gcc-patches; kito.cheng; jeffreyalaw; rdapp.gcc Subject: Re: [PATCH] RISC-V: Disallow RVV mode address for any load/store[PR112535] Curious about the code gen impact, does it make IRA/LRA insert one more move like (set (reg:DI) (subreg:DI (reg:V1DI 155) 0)) and then (set (mem:SI (reg:DI)) (const_int 0))? On Wed, Nov 15, 2023 at 3:15 PM Juzhe-Zhong wrote: This patch is quite obvious patch which disallow for load/store address register with RVV mode. PR target/112535 gcc/ChangeLog: * config/riscv/riscv.cc (riscv_legitimate_address_p): Disallow RVV modes base address. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/autovec/pr112535.c: New test. --- gcc/config/riscv/riscv.cc | 4 .../gcc.target/riscv/rvv/autovec/pr112535.c | 17 + 2 files changed, 21 insertions(+) create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc index ecee7eb4727..e919850fc6c 100644 --- a/gcc/config/riscv/riscv.cc +++ b/gcc/config/riscv/riscv.cc @@ -1427,6 +1427,10 @@ static bool riscv_legitimate_address_p (machine_mode mode, rtx x, bool strict_p, code_helper = ERROR_MARK) { + /* Disallow RVV modes base address. + E.g. (mem:SI (subreg:DI (reg:V1DI 155) 0). */ + if (SUBREG_P (x) && riscv_v_ext_mode_p (GET_MODE (SUBREG_REG (x +return false; struct riscv_address_info addr; return riscv_classify_address (, x, mode, strict_p); diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c new file mode 100644 index 000..95799aab8d2 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112535.c @@ -0,0 +1,17 @@ +/* { dg-do compile } */ +/* { dg-options "-march=rv64gcv -mabi=lp64d -O3" } */ + +int *a, *f; +char b, c; +int ***d; +static int e = +void g() { + c = 3; + for (; c; c--) +if (c < 8) { + f = 0; + ***e = a; +} + if (b) +***d = 0; +} -- 2.36.3