diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c9b3888..bf61b7f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -202,6 +202,7 @@ jobs:
       fail-fast: false
       matrix:
         config:
+        - {target: i386,    toolchain: gcc-multilib,              cc: gcc -m32,                   qemu: qemu-i386-static    }
         - {target: arm,     toolchain: gcc-arm-linux-gnueabi,     cc: arm-linux-gnueabi-gcc,      qemu: qemu-arm-static     }
         - {target: armhf,   toolchain: gcc-arm-linux-gnueabihf,   cc: arm-linux-gnueabihf-gcc,    qemu: qemu-arm-static     }
         - {target: aarch64, toolchain: gcc-aarch64-linux-gnu,     cc: aarch64-linux-gnu-gcc,      qemu: qemu-aarch64-static }
@@ -217,6 +218,10 @@ jobs:
         - {target: alpha,   toolchain: gcc-alpha-linux-gnu,       cc: alpha-linux-gnu-gcc,        qemu: qemu-alpha-static   }
         - {target: sparc64, toolchain: gcc-sparc64-linux-gnu,     cc: sparc64-linux-gnu-gcc,      qemu: qemu-sparc64-static, skip_wasi: true }
 
+        - {target: i386 (u64 slots),    toolchain: gcc-multilib,              cc: gcc -m32,                   qemu: qemu-i386-static,   cflags: -Dd_m3Use32BitSlots=0  }
+        - {target: ppc (u64 slots),     toolchain: gcc-powerpc-linux-gnu,     cc: powerpc-linux-gnu-gcc,      qemu: qemu-ppc-static,    cflags: -Dd_m3Use32BitSlots=0  }
+        - {target: ppc64 (u64 slots),   toolchain: gcc-powerpc64-linux-gnu,   cc: powerpc64-linux-gnu-gcc,    qemu: qemu-ppc64-static,  cflags: -Dd_m3Use32BitSlots=0  }
+
     steps:
     - uses: actions/checkout@v2
     - name: Install QEMU