py/emitinlinerv32: Add inline assembler support for RV32.

This commit adds support for writing inline assembler functions when
targeting a RV32IMC processor.

Given that this takes up a bit of rodata space due to its large
instruction decoding table and its extensive error messages, it is
enabled by default only on offline targets such as mpy-cross and the
qemu port.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

1 files changed, 49 insertions, 0 deletions

diff --git a/tests/inlineasm/rv32/asmconst.py b/tests/inlineasm/rv32/asmconst.py
new file mode 100644
index 000000000..2b6363a43
--- /dev/null
+++ b/tests/inlineasm/rv32/asmconst.py
@@ -0,0 +1,49 @@
+# test constants in assembler
+
+
+@micropython.asm_rv32
+def c1():
+    li(a0, 0xFFFFFFFF)
+    li(a1, 0xF0000000)
+    sub(a0, a0, a1)
+
+
+print(hex(c1()))
+
+
+@micropython.asm_rv32
+def c2():
+    lui(a0, 0x12345)
+    li(a1, 0x678)
+    add(a0, a0, a1)
+
+
+print(hex(c2()))
+
+
+@micropython.asm_rv32
+def c3() -> uint:
+    lui(a0, 0)
+    addi(a0, a0, 0x7FF)
+
+
+print(hex(c3()))
+
+
+@micropython.asm_rv32
+def c4() -> uint:
+    lui(a0, 0)
+    addi(a0, a0, -1)
+
+
+print(hex(c4()))
+
+
+@micropython.asm_rv32
+def c5():
+    c_lui(a0, 1)
+    c_li(a1, 1)
+    c_add(a0, a1)
+
+
+print(hex(c5()))