Hi, I would like to have a ping.....
BR, Jeff (Jiufu Guo) Jiufu Guo <guoji...@linux.ibm.com> writes: > Hi, > > As mentioned in PR108338, on p9, we could use mtvsrws to implement > the bitcast from SI to SF (or lowpart DI to SF). > > For code: > *(long long*)buff = di; > float f = *(float*)(buff); > > "sldi 9,3,32 ; mtvsrd 1,9 ; xscvspdpn 1,1" is generated. > A better one would be "mtvsrws 1,3 ; xscvspdpn 1,1". > > Compare with previous patch: > https://gcc.gnu.org/pipermail/gcc-patches/2023-July/623533.html > "highpart DI-->SF" is put to a seperate patch. > > Pass bootstrap and regression on ppc64{,le}. > Is this ok for trunk? > > BR, > Jeff (Jiufu Guo) > > gcc/ChangeLog: > > * config/rs6000/rs6000.md (movsf_from_si): Update to generate mtvsrws > for P9. > > gcc/testsuite/ChangeLog: > > * gcc.target/powerpc/pr108338.c: Updated to check mtvsrws for p9. > > --- > gcc/config/rs6000/rs6000.md | 25 ++++++++++++++++----- > gcc/testsuite/gcc.target/powerpc/pr108338.c | 6 +++-- > 2 files changed, 23 insertions(+), 8 deletions(-) > > diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md > index > 8c92cbf976de915136ad5dba24e69a363d21438d..c03e677bca79e8fb1acb276d07d0acfae009f6d8 > 100644 > --- a/gcc/config/rs6000/rs6000.md > +++ b/gcc/config/rs6000/rs6000.md > @@ -8280,13 +8280,26 @@ (define_insn_and_split "movsf_from_si" > { > rtx op0 = operands[0]; > rtx op1 = operands[1]; > - rtx op2 = operands[2]; > - rtx op1_di = gen_rtx_REG (DImode, REGNO (op1)); > > - /* Move SF value to upper 32-bits for xscvspdpn. */ > - emit_insn (gen_ashldi3 (op2, op1_di, GEN_INT (32))); > - emit_insn (gen_p8_mtvsrd_sf (op0, op2)); > - emit_insn (gen_vsx_xscvspdpn_directmove (op0, op0)); > + /* Move lowpart 32-bits from register for SFmode. */ > + if (TARGET_P9_VECTOR) > + { > + /* Using mtvsrws;xscvspdpn. */ > + rtx op0_v = gen_rtx_REG (V4SImode, REGNO (op0)); > + emit_insn (gen_vsx_splat_v4si (op0_v, op1)); > + emit_insn (gen_vsx_xscvspdpn_directmove (op0, op0)); > + } > + else > + { > + rtx op2 = operands[2]; > + rtx op1_di = gen_rtx_REG (DImode, REGNO (op1)); > + > + /* Using ashl;mtvsrd;xscvspdpn. */ > + emit_insn (gen_ashldi3 (op2, op1_di, GEN_INT (32))); > + emit_insn (gen_p8_mtvsrd_sf (op0, op2)); > + emit_insn (gen_vsx_xscvspdpn_directmove (op0, op0)); > + } > + > DONE; > } > [(set_attr "length" > diff --git a/gcc/testsuite/gcc.target/powerpc/pr108338.c > b/gcc/testsuite/gcc.target/powerpc/pr108338.c > index > 6db65595343c2407fc32f68f5f52a1f7196c371d..0565e5254ed0a8cc579cf505a3f865426dcf62ae > 100644 > --- a/gcc/testsuite/gcc.target/powerpc/pr108338.c > +++ b/gcc/testsuite/gcc.target/powerpc/pr108338.c > @@ -19,9 +19,11 @@ float __attribute__ ((noipa)) sf_from_di_off4 (long long > l) > > /* Under lp64, parameter 'l' is in one DI reg, then bitcast sub DI to SF. */ > /* { dg-final { scan-assembler-times {\mxscvspdpn\M} 2 { target { lp64 && > has_arch_pwr8 } } } } */ > -/* { dg-final { scan-assembler-times {\mmtvsrd\M} 2 { target { lp64 && > has_arch_pwr8 } } } } */ > +/* { dg-final { scan-assembler-times {\mmtvsrd\M} 2 { target { lp64 && { > has_arch_pwr8 && { ! has_arch_pwr9 } } } } } } */ > +/* { dg-final { scan-assembler-times {\msldi\M} 1 { target { lp64 && { > has_arch_pwr8 && { ! has_arch_pwr9 } } } } } } */ > +/* { dg-final { scan-assembler-times {\mmtvsrd\M} 1 { target { lp64 && > has_arch_pwr9 } } } } */ > +/* { dg-final { scan-assembler-times {\mmtvsrws\M} 1 { target { lp64 && > has_arch_pwr9 } } } } */ > /* { dg-final { scan-assembler-times {\mrldicr\M} 1 { target { lp64 && > has_arch_pwr8 } } } } */ > -/* { dg-final { scan-assembler-times {\msldi\M} 1 { target { lp64 && > has_arch_pwr8 } } } } */ > > union di_sf_sf > {
