tcg/s390x: Fix encoding of VRIc, VRSa, VRSc insns

While the format names the second vector register 'v3',
it is still in the second position (bits 12-15) and
the argument to RXB must match.

Example error:
 -   e7 00 00 10 2a 33       verllf  %v16,%v0,16
 +   e7 00 00 10 2c 33       verllf  %v16,%v16,16

Cc: qemu-stable@nongnu.org
Reported-by: Michael Tokarev <mjt@tls.msk.ru>
Fixes: 22cb37b ("tcg/s390x: Implement vector shift operations")
Fixes: 79cada8 ("tcg/s390x: Implement tcg_out_dup*_vec")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2054
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Michael Tokarev <mjt@tls.msk.ru>
Message-Id: <20240117213646.159697-2-richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
(cherry picked from commit c1ddc18)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

tcg/s390x/tcg-target.c.inc

@@ -683,7 +683,7 @@ static void tcg_out_insn_VRIc(TCGContext *s, S390Opcode op,
     tcg_debug_assert(is_vector_reg(v3));
     tcg_out16(s, (op & 0xff00) | ((v1 & 0xf) << 4) | (v3 & 0xf));
     tcg_out16(s, i2);
-    tcg_out16(s, (op & 0x00ff) | RXB(v1, 0, v3, 0) | (m4 << 12));
+    tcg_out16(s, (op & 0x00ff) | RXB(v1, v3, 0, 0) | (m4 << 12));
 }
 
 static void tcg_out_insn_VRRa(TCGContext *s, S390Opcode op,
@@ -738,7 +738,7 @@ static void tcg_out_insn_VRSa(TCGContext *s, S390Opcode op, TCGReg v1,
     tcg_debug_assert(is_vector_reg(v3));
     tcg_out16(s, (op & 0xff00) | ((v1 & 0xf) << 4) | (v3 & 0xf));
     tcg_out16(s, b2 << 12 | d2);
-    tcg_out16(s, (op & 0x00ff) | RXB(v1, 0, v3, 0) | (m4 << 12));
+    tcg_out16(s, (op & 0x00ff) | RXB(v1, v3, 0, 0) | (m4 << 12));
 }
 
 static void tcg_out_insn_VRSb(TCGContext *s, S390Opcode op, TCGReg v1,
@@ -762,7 +762,7 @@ static void tcg_out_insn_VRSc(TCGContext *s, S390Opcode op, TCGReg r1,
     tcg_debug_assert(is_vector_reg(v3));
     tcg_out16(s, (op & 0xff00) | (r1 << 4) | (v3 & 0xf));
     tcg_out16(s, b2 << 12 | d2);
-    tcg_out16(s, (op & 0x00ff) | RXB(0, 0, v3, 0) | (m4 << 12));
+    tcg_out16(s, (op & 0x00ff) | RXB(0, v3, 0, 0) | (m4 << 12));
 }
 
 static void tcg_out_insn_VRX(TCGContext *s, S390Opcode op, TCGReg v1,