add launchpad bug reports without comments

1 files changed, 30 insertions, 0 deletions

diff --git a/results/scraper/launchpad-without-comments/1906536 b/results/scraper/launchpad-without-comments/1906536
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+Unable to set SVE VL to 1024 bits or above since 7b6a2198
+
+Prior to 7b6a2198e71794c851f39ac7a92d39692c786820, the QEMU option sve-max-vq could be used to set the vector length of the implementation. This is useful (among other reasons) for testing software compiled with a fixed SVE vector length. Since this commit, the vector length is capped at 512 bits.
+
+To reproduce the issue:
+
+$ cat rdvl.s
+.global _start
+_start:
+  rdvl x0, #1
+  asr x0, x0, #4
+  mov x8, #93 // exit
+  svc #0
+$ aarch64-linux-gnu-as -march=armv8.2-a+sve rdvl.s -o rdvl.o
+$ aarch64-linux-gnu-ld rdvl.o
+$ for vl in 1 2 4 8 16; do ../build-qemu/aarch64-linux-user/qemu-aarch64 -cpu max,sve-max-vq=$vl a.out; echo $?; done
+1
+2
+4
+4
+4
+
+For a QEMU built prior to the above revision, we get the output:
+1
+2
+4
+8
+16
+
+as expected. It seems that either the old behavior should be restored, or there should be an option to force a higher vector length?
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