ppc64le: patch to avoid missing issignaling

recipe/build.sh

@@ -49,7 +49,7 @@ if [[ "$CONDA_BUILD_CROSS_COMPILATION" == "1" ]]; then
            exit 1
            ;;
     esac
-    
+
     EXTRA_ARGS="--cross-compiling --dest-os=$DEST_OS --dest-cpu=$DEST_ARCH"
 fi
 

recipe/meta.yaml

@@ -19,6 +19,7 @@ source:
     - 0001-Forward-ceilf-floorf.patch  # [not win]
     - 0001-Force-include-handler-outside-simulator.patch  # [osx and arm64]
     - test-dep-shared-openssl.patch  # [not win]
+    - ppc-issignaling.patch  # [ppc64le]
 
 build:
   number: 0

recipe/ppc-issignaling.patch

@@ -0,0 +1,24 @@
+diff --git a/deps/v8/src/execution/ppc/simulator-ppc.cc b/deps/v8/src/execution/ppc/simulator-ppc.cc
+index 97e47bc0..3ac0cff8 100644
+--- a/deps/v8/src/execution/ppc/simulator-ppc.cc
++++ b/deps/v8/src/execution/ppc/simulator-ppc.cc
+@@ -4751,7 +4751,8 @@ void Simulator::ExecuteGeneric(Instruction* instr) {
+           bit_cast<float, uint32_t>(static_cast<uint32_t>(double_bits >> 32));
+       double_bits = bit_cast<uint64_t, double>(static_cast<double>(f));
+       // Preserve snan.
+-      if (issignaling(f)) {
++      float snan = std::numeric_limits<float>::signaling_NaN();
++      if (std::memcmp(&snan, &f, sizeof(float)) == 0) {
+         double_bits &= 0xFFF7FFFFFFFFFFFFU;  // Clear bit 51.
+       }
+       set_d_register(t, double_bits);
+@@ -4764,7 +4765,8 @@ void Simulator::ExecuteGeneric(Instruction* instr) {
+       uint64_t float_bits = static_cast<uint64_t>(
+           bit_cast<uint32_t, float>(static_cast<float>(b_val)));
+       // Preserve snan.
+-      if (issignaling(b_val)) {
++      double snan = std::numeric_limits<double>::signaling_NaN();
++      if (std::memcmp(&snan, &b_val, sizeof(double)) == 0) {
+         float_bits &= 0xFFBFFFFFU;  // Clear bit 22.
+       }
+       // fp result is placed in both 32bit halfs of the dst.