test/codegen: add combined conversion and shift tests

This adds tests for type conversion and shifts, detailing various
poor bad code generation that currently exists for riscv64. This
will be addressed in future CLs.

Change-Id: Ie1d366dfe878832df691600f8500ef383da92848
Reviewed-on: https://go-review.googlesource.com/c/go/+/615678
Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>

diff --git a/test/codegen/shift.go b/test/codegen/shift.go
index b7819d236fe9ebcb34ddcf51332b5fdb6c2f5e7c..98d621d35204c62f6e3a54cd22b4fe64f0e34b34 100644 (file)
--- a/test/codegen/shift.go
+++ b/test/codegen/shift.go
@@ -592,3 +592,67 @@ func checkLeftShiftWithAddition(a int64, b int64) int64 {
        a = a + b<<3
        return a
 }
+
+//
+// Convert and shift.
+//
+
+func rsh64Uto32U(v uint64) uint32 {
+       x := uint32(v)
+       // riscv64:"MOVWU"
+       if x > 8 {
+               // riscv64:"SRLIW",-"MOVWU",-"SLLI"
+               x >>= 2
+       }
+       return x
+}
+
+func rsh64Uto16U(v uint64) uint16 {
+       x := uint16(v)
+       // riscv64:"MOVHU"
+       if x > 8 {
+               // riscv64:"SLLI","SRLI"
+               x >>= 2
+       }
+       return x
+}
+
+func rsh64Uto8U(v uint64) uint8 {
+       x := uint8(v)
+       // riscv64:"MOVBU"
+       if x > 8 {
+               // riscv64:"SLLI","SRLI"
+               x >>= 2
+       }
+       return x
+}
+
+func rsh64to32(v int64) int32 {
+       x := int32(v)
+       // riscv64:"MOVW"
+       if x > 8 {
+               // riscv64:"SRAIW",-"MOVW",-"SLLI"
+               x >>= 2
+       }
+       return x
+}
+
+func rsh64to16(v int64) int16 {
+       x := int16(v)
+       // riscv64:"MOVH"
+       if x > 8 {
+               // riscv64:"SLLI","SRAI"
+               x >>= 2
+       }
+       return x
+}
+
+func rsh64to8(v int64) int8 {
+       x := int8(v)
+       // riscv64:"MOVB"
+       if x > 8 {
+               // riscv64:"SLLI","SRAI"
+               x >>= 2
+       }
+       return x
+}