PPC/s390: [wasm-simd][liftoff] Implement double precision conversions

Port 66964c51

Original Commit Message:

    Extract codegen into macro-assembler functions for reuse in Liftoff.

    Some minor tweaks in I32x4TruncSatF64x2SZero and I32x4TruncSatF64x2UZero
    to check dst and src overlap and move to scratch/dst accordingly. In
    TurboFan we can set these restrictions in the instruction-selector, but
    not in Liftoff. This doesn't make TurboFan codegen any worse, since
    those restrictions are still in place.

R=zhin@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: Iae59472a5e77c1becc5ff880081f2c0c8c149630
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2690828Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72676}

src/wasm/baseline/ppc/liftoff-assembler-ppc.h

@@ -700,6 +700,21 @@ void LiftoffAssembler::emit_f64x2_pmax(LiftoffRegister dst, LiftoffRegister lhs,
   bailout(kSimd, "pmax unimplemented");
 }
 
+void LiftoffAssembler::emit_f64x2_convert_low_i32x4_s(LiftoffRegister dst,
+                                                      LiftoffRegister src) {
+  bailout(kSimd, "f64x2.convert_low_i32x4_s");
+}
+
+void LiftoffAssembler::emit_f64x2_convert_low_i32x4_u(LiftoffRegister dst,
+                                                      LiftoffRegister src) {
+  bailout(kSimd, "f64x2.convert_low_i32x4_u");
+}
+
+void LiftoffAssembler::emit_f64x2_promote_low_f32x4(LiftoffRegister dst,
+                                                    LiftoffRegister src) {
+  bailout(kSimd, "f64x2.promote_low_f32x4");
+}
+
 void LiftoffAssembler::emit_f32x4_splat(LiftoffRegister dst,
                                         LiftoffRegister src) {
   bailout(kUnsupportedArchitecture, "emit_f32x4_splat");
@@ -1524,6 +1539,11 @@ void LiftoffAssembler::emit_f32x4_uconvert_i32x4(LiftoffRegister dst,
   bailout(kSimd, "f32x4_uconvert_i32x4");
 }
 
+void LiftoffAssembler::emit_f32x4_demote_f64x2_zero(LiftoffRegister dst,
+                                                    LiftoffRegister src) {
+  bailout(kSimd, "f32x4.demote_f64x2_zero");
+}
+
 void LiftoffAssembler::emit_i8x16_sconvert_i16x8(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
@@ -1588,6 +1608,16 @@ void LiftoffAssembler::emit_i32x4_uconvert_i16x8_high(LiftoffRegister dst,
   bailout(kUnsupportedArchitecture, "emit_i32x4_uconvert_i16x8_high");
 }
 
+void LiftoffAssembler::emit_i32x4_trunc_sat_f64x2_s_zero(LiftoffRegister dst,
+                                                         LiftoffRegister src) {
+  bailout(kSimd, "i32x4.trunc_sat_f64x2_s_zero");
+}
+
+void LiftoffAssembler::emit_i32x4_trunc_sat_f64x2_u_zero(LiftoffRegister dst,
+                                                         LiftoffRegister src) {
+  bailout(kSimd, "i32x4.trunc_sat_f64x2_u_zero");
+}
+
 void LiftoffAssembler::emit_s128_and_not(LiftoffRegister dst,
                                          LiftoffRegister lhs,
                                          LiftoffRegister rhs) {

src/wasm/baseline/s390/liftoff-assembler-s390.h

@@ -1280,6 +1280,21 @@ void LiftoffAssembler::emit_f64x2_pmax(LiftoffRegister dst, LiftoffRegister lhs,
   bailout(kSimd, "pmax unimplemented");
 }
 
+void LiftoffAssembler::emit_f64x2_convert_low_i32x4_s(LiftoffRegister dst,
+                                                      LiftoffRegister src) {
+  bailout(kSimd, "f64x2.convert_low_i32x4_s");
+}
+
+void LiftoffAssembler::emit_f64x2_convert_low_i32x4_u(LiftoffRegister dst,
+                                                      LiftoffRegister src) {
+  bailout(kSimd, "f64x2.convert_low_i32x4_u");
+}
+
+void LiftoffAssembler::emit_f64x2_promote_low_f32x4(LiftoffRegister dst,
+                                                    LiftoffRegister src) {
+  bailout(kSimd, "f64x2.promote_low_f32x4");
+}
+
 void LiftoffAssembler::emit_f32x4_splat(LiftoffRegister dst,
                                         LiftoffRegister src) {
   bailout(kUnsupportedArchitecture, "emit_f32x4_splat");
@@ -2132,6 +2147,11 @@ void LiftoffAssembler::emit_f32x4_uconvert_i32x4(LiftoffRegister dst,
   bailout(kSimd, "f32x4_uconvert_i32x4");
 }
 
+void LiftoffAssembler::emit_f32x4_demote_f64x2_zero(LiftoffRegister dst,
+                                                    LiftoffRegister src) {
+  bailout(kSimd, "f32x4.demote_f64x2_zero");
+}
+
 void LiftoffAssembler::emit_i8x16_sconvert_i16x8(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
@@ -2196,6 +2216,16 @@ void LiftoffAssembler::emit_i32x4_uconvert_i16x8_high(LiftoffRegister dst,
   bailout(kUnsupportedArchitecture, "emit_i32x4_uconvert_i16x8_high");
 }
 
+void LiftoffAssembler::emit_i32x4_trunc_sat_f64x2_s_zero(LiftoffRegister dst,
+                                                         LiftoffRegister src) {
+  bailout(kSimd, "i32x4.trunc_sat_f64x2_s_zero");
+}
+
+void LiftoffAssembler::emit_i32x4_trunc_sat_f64x2_u_zero(LiftoffRegister dst,
+                                                         LiftoffRegister src) {
+  bailout(kSimd, "i32x4.trunc_sat_f64x2_u_zero");
+}
+
 void LiftoffAssembler::emit_s128_and_not(LiftoffRegister dst,
                                          LiftoffRegister lhs,
                                          LiftoffRegister rhs) {