From: Andrew Jones <drjones@redhat.com>
Date: Fri, 2 Aug 2019 12:25:30 +0000 (+0200)
Subject: target/arm/helper: zcr: Add build bug next to value range assumption
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7b351d98709d3f77d6bb18562e1bf228862b0d57;p=qemu.git

target/arm/helper: zcr: Add build bug next to value range assumption

The current implementation of ZCR_ELx matches the architecture, only
implementing the lower four bits, with the rest RAZ/WI. This puts
a strict limit on ARM_MAX_VQ of 16. Make sure we don't let ARM_MAX_VQ
grow without a corresponding update here.

Suggested-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 24806c16ca..2fd504ea7a 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -5300,6 +5300,7 @@ static void zcr_write(CPUARMState *env, const ARMCPRegInfo *ri,
     int new_len;
 
     /* Bits other than [3:0] are RAZ/WI.  */
+    QEMU_BUILD_BUG_ON(ARM_MAX_VQ > 16);
     raw_write(env, ri, value & 0xf);
 
     /*