Add a verifier pass for CPU flags.

Only one CPU flags value can be live at a time, and some instructions clobber the flags.
2017-10-18 14:03:46 -07:00
parent c3446ee472
commit b948de1693
7 changed files with 259 additions and 7 deletions
--- a/cranelift/filetests/isa/riscv/verify-encoding.cton
+++ b/cranelift/filetests/isa/riscv/verify-encoding.cton
@@ -16,6 +16,6 @@ function %RV32I(i32 link [%x1]) -> i32 link [%x1] {
 ebb0(v9999: i32):
    v1 = iconst.i32 1
    v2 = iconst.i32 2
-    [R#0,-]         v3 = iadd v1, v2 ; error: Instruction encoding R#00 doesn't match any possibilities
+    [R#0,-]         v3 = iadd v1, v2 ; error: encoding R#00 should be R#0c
    return v9999
 }