Compress loads/stores with implicit 0 offset.

	gas/
	* config/tc-riscv.c (riscv_handle_implicit_zero_offset): New.
	(riscv_ip): Cases 'k', 'l', 'm', 'n', 'M', 'N', add call to
	riscv_handle_implicit_zero_offset.  At label load_store, replace
	existing code with call to riscv_handle_implicit_zero_offset.
	* testsuite/gas/riscv/c-ld.d, testsuite/gas/riscv/c-ld.s: New.
	* testsuite/gas/riscv/c-lw.d, testsuite/gas/riscv/c-lw.s: New.
	* testsuite/gas/riscv/riscv.exp: Run new tests.

5 files changed, 54 insertions, 0 deletions

diff --git a/gas/testsuite/gas/riscv/c-ld.d b/gas/testsuite/gas/riscv/c-ld.d
new file mode 100644
index 0000000..29315e6
--- /dev/null
+++ b/gas/testsuite/gas/riscv/c-ld.d
@@ -0,0 +1,17 @@
+#as: -march=rv64ic
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+0:[ 	]+6108[ 	]+ld[ 	]+a0,0\(a0\)
+[ 	]+2:[ 	]+6108[ 	]+ld[ 	]+a0,0\(a0\)
+[ 	]+4:[ 	]+e108[ 	]+sd[ 	]+a0,0\(a0\)
+[ 	]+6:[ 	]+e108[ 	]+sd[ 	]+a0,0\(a0\)
+[ 	]+8:[ 	]+6502[ 	]+ld[ 	]+a0,0\(sp\)
+[ 	]+a:[ 	]+6502[ 	]+ld[ 	]+a0,0\(sp\)
+[ 	]+c:[ 	]+e02a[ 	]+sd[ 	]+a0,0\(sp\)
+[ 	]+e:[ 	]+e02a[ 	]+sd[ 	]+a0,0\(sp\)
diff --git a/gas/testsuite/gas/riscv/c-ld.s b/gas/testsuite/gas/riscv/c-ld.s
new file mode 100644
index 0000000..11b9e55
--- /dev/null
+++ b/gas/testsuite/gas/riscv/c-ld.s
@@ -0,0 +1,9 @@
+target:
+	ld a0, (a0)  # 'Cl'
+	ld a0, 0(a0) # 'Cl'
+	sd a0, (a0)  # 'Cl'
+	sd a0, 0(a0) # 'Cl'
+	ld a0, (sp)  # 'Cn'
+	ld a0, 0(sp) # 'Cn'
+	sd a0, (sp)  # 'CN'
+	sd a0, 0(sp) # 'CN'
diff --git a/gas/testsuite/gas/riscv/c-lw.d b/gas/testsuite/gas/riscv/c-lw.d
new file mode 100644
index 0000000..f3ea3b2
--- /dev/null
+++ b/gas/testsuite/gas/riscv/c-lw.d
@@ -0,0 +1,17 @@
+#as: -march=rv32ic
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+0:[ 	]+4108[ 	]+lw[ 	]+a0,0\(a0\)
+[ 	]+2:[ 	]+4108[ 	]+lw[ 	]+a0,0\(a0\)
+[ 	]+4:[ 	]+c108[ 	]+sw[ 	]+a0,0\(a0\)
+[ 	]+6:[ 	]+c108[ 	]+sw[ 	]+a0,0\(a0\)
+[ 	]+8:[ 	]+4502[ 	]+lw[ 	]+a0,0\(sp\)
+[ 	]+a:[ 	]+4502[ 	]+lw[ 	]+a0,0\(sp\)
+[ 	]+c:[ 	]+c02a[ 	]+sw[ 	]+a0,0\(sp\)
+[ 	]+e:[ 	]+c02a[ 	]+sw[ 	]+a0,0\(sp\)
diff --git a/gas/testsuite/gas/riscv/c-lw.s b/gas/testsuite/gas/riscv/c-lw.s
new file mode 100644
index 0000000..3cf58f9
--- /dev/null
+++ b/gas/testsuite/gas/riscv/c-lw.s
@@ -0,0 +1,9 @@
+target:
+	lw a0, (a0)  # 'Ck'
+	lw a0, 0(a0) # 'Ck'
+	sw a0, (a0)  # 'Ck'
+	sw a0, 0(a0) # 'Ck'
+	lw a0, (sp)  # 'Cm'
+	lw a0, 0(sp) # 'Cm'
+	sw a0, (sp)  # 'CM'
+	sw a0, 0(sp) # 'CM'
diff --git a/gas/testsuite/gas/riscv/riscv.exp b/gas/testsuite/gas/riscv/riscv.exp
index 8a128ac..5ef92f5 100644
--- a/gas/testsuite/gas/riscv/riscv.exp
+++ b/gas/testsuite/gas/riscv/riscv.exp
@@ -26,4 +26,6 @@ if [istarget riscv*-*-*] {
     run_dump_test "c-addi16sp-fail"
     run_dump_test "satp"
     run_dump_test "eh-relocs"
+    run_dump_test "c-lw"
+    run_dump_test "c-ld"
 }