Encode iconst.i32 for RISC-V.

For large constants with the low 12 bits clear, we already have the "lui" encoding. Add "addi %x0" encodings for signed 12-bit constants.
2017-06-22 12:11:54 -07:00
parent e83e2ccf17
commit 9e02b9818f
5 changed files with 27 additions and 2 deletions
--- a/filetests/isa/riscv/binary32.cton
+++ b/filetests/isa/riscv/binary32.cton
@@ -77,6 +77,9 @@ ebb0(v9999: i32):
    ; lui
    [-,%x7]     v140 = iconst.i32 0x12345000            ; bin: 123453b7
    [-,%x16]    v141 = iconst.i32 0xffffffff_fedcb000   ; bin: fedcb837
+    ; addi
+    [-,%x7]     v142 = iconst.i32 1000                  ; bin: 3e800393
+    [-,%x16]    v143 = iconst.i32 -905                  ; bin: c7700813

    ; Copies alias to iadd_imm.
    [-,%x7]     v150 = copy v1                          ; bin: 00050393