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, 63 insertions, 0 deletions

diff --git a/tests/inlineasm/rv32/asmdivmul.py b/tests/inlineasm/rv32/asmdivmul.py
new file mode 100644
index 0000000000..e1120c6f63
--- /dev/null
+++ b/tests/inlineasm/rv32/asmdivmul.py
@@ -0,0 +1,63 @@
+@micropython.asm_rv32
+def sdiv(a0, a1):
+    div(a0, a0, a1)
+
+
+@micropython.asm_rv32
+def udiv(a0, a1):
+    divu(a0, a0, a1)
+
+
+@micropython.asm_rv32
+def srem(a0, a1):
+    rem(a0, a0, a1)
+
+
+@micropython.asm_rv32
+def urem(a0, a1):
+    remu(a0, a0, a1)
+
+
+print(sdiv(1234, 3))
+print(sdiv(-1234, 3))
+print(sdiv(1234, -3))
+print(sdiv(-1234, -3))
+
+print(udiv(1234, 3))
+print(udiv(0xFFFFFFFF, 0x7FFFFFFF))
+print(udiv(0xFFFFFFFF, 0xFFFFFFFF))
+
+print(srem(1234, 3))
+print(srem(-1234, 3))
+print(srem(1234, -3))
+print(srem(-1234, -3))
+
+print(urem(1234, 3))
+print(urem(0xFFFFFFFF, 0x7FFFFFFF))
+print(urem(0xFFFFFFFF, 0xFFFFFFFF))
+
+
+@micropython.asm_rv32
+def m1(a0, a1):
+    mul(a0, a0, a1)
+
+
+@micropython.asm_rv32
+def m2(a0, a1):
+    mulh(a0, a0, a1)
+
+
+@micropython.asm_rv32
+def m3(a0, a1):
+    mulhu(a0, a0, a1)
+
+
+@micropython.asm_rv32
+def m4(a0, a1):
+    mulhsu(a0, a0, a1)
+
+
+print(m1(0xFFFFFFFF, 2))
+print(m2(0xFFFFFFFF, 0xFFFFFFF0))
+print(m3(0xFFFFFFFF, 0xFFFFFFF0))
+print(m4(0xFFFFFFFF, 0xFFFFFFF0))