On i386, Nanojit has two basic modes of operation:\u00a0 SSE, and non-SSE.\u00a0 Non-SSE is for old machines that don’t support SSE instructions.\u00a0 (It might actually be SSE2 instructions, I’m not sure.)\u00a0 My two machines both support SSE and so the non-SSE is never exercised unless I specify the environment variable X86_FORCE_SSE=no.\u00a0 Since this invocation doesn’t exactly roll off the fingertips, I don’t do it often.\u00a0 It’s also easy to mistype, in which case the normal SSE code will be run but I probably won’t notice and so I’m testing something different to what I think I am testing.<\/p>\n
I recently committed a patch (bug 516348<\/a>) that broke the non-SSE mode.\u00a0 (It may have also broken the SSE mode, but in a less obvious way.)\u00a0 Whenever I land a patch that breaks something, I try to work out if I could have avoided the breakage through a better process.\u00a0 In this case I could have, through automation.\u00a0 I now have the following set of aliases and functions in my .bashrc:<\/p>\n The code is boring.\u00a0 For those reading closely, it relies on the fact that I always put different builds in the directories debug32\/, opt32\/, debug64\/, opt64\/.\u00a0 And I skip check-data-format-tofte.js because it fails if you’re in a non-US timezone, see bug 515214<\/a>.<\/p>\n I already had ‘jsdtt32’ et al, each of which tests a single configuration.\u00a0 But now with a single command ‘jsatt’ (which is short for “JavaScript All trace-tests”) I can run the JS trace-tests on 6 different configurations on a single x86-64 machine: 32-bit debug (SSE), 32-bit debug (non-SSE), 64-bit debug, 32-bit optimised (SSE), 32-bit optimised (non-SSE), 64-bit optimised.\u00a0 And it builds them to make sure they’re all up-to-date.<\/p>\n It’s only a small process change for me, but it means that it’s unlikely I will break any of these configurations in the future, or at least, not in a way that shows up in the trace-tests.<\/p>\n","protected":false},"excerpt":{"rendered":" On i386, Nanojit has two basic modes of operation:\u00a0 SSE, and non-SSE.\u00a0 Non-SSE is for old machines that don’t support SSE instructions.\u00a0 (It might actually be SSE2 instructions, I’m not sure.)\u00a0 My two machines both support SSE and so the non-SSE is never exercised unless I specify the environment variable X86_FORCE_SSE=no.\u00a0 Since this invocation doesn’t […]<\/p>\n","protected":false},"author":139,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/posts\/204"}],"collection":[{"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/users\/139"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/comments?post=204"}],"version-history":[{"count":0,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/posts\/204\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/media?parent=204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/categories?post=204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.mozilla.org\/nnethercote\/wp-json\/wp\/v2\/tags?post=204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}alias jstt_prefix=\"python trace-test\/trace-test.py\"\r\nJSTTARGS32=\"--no-slow -f -x sunspider\/check-date-format-tofte.js\"\r\nJSTTARGS64=\"$JSTTARGS32\"\r\n\r\nalias jsdtt32=\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 jstt_prefix debug32\/js $JSTTARGS32\"\r\nalias jsott32=\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 jstt_prefix opt32\/js\u00a0\u00a0 $JSTTARGS32\"\r\nalias jsdtt32b=\"X86_FORCE_SSE2=no jstt_prefix debug32\/js $JSTTARGS32\"\r\nalias jsott32b=\"X86_FORCE_SSE2=no jstt_prefix opt32\/js\u00a0\u00a0 $JSTTARGS32\"\r\nalias jsott64=\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 jstt_prefix opt64\/js\u00a0\u00a0 $JSTTARGS64\"\r\nalias jsdtt64=\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 jstt_prefix debug64\/js $JSTTARGS64\"\r\n\r\nfunction jsatt\r\n{\r\n if [ -d debug32 ] && [ -d debug64 ] && [ -d opt32 ] && [ -d opt64 ] ; then\r\n cd debug32 && mq && cd .. && \\\r\n cd debug64 && mq && cd .. && \\\r\n cd opt32 && mq && cd .. && \\\r\n cd opt64 && mq && cd ..\r\n\r\n if [ $? -eq 0 ] ; then\r\n echo\r\n echo \"debug32\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 && jsdtt32\u00a0\u00a0 && echo\r\n echo \"debug32 (no SSE)\" && jsdtt32b\u00a0 && echo\r\n echo \"debug64\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 && jsdtt64\u00a0\u00a0 && echo\r\n echo \"opt32\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 && jsott32\u00a0\u00a0 && echo\r\n echo \"opt32 (no SSE)\"\u00a0\u00a0 && jsott32b\u00a0 && echo\r\n echo \"opt64\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 && jsott64\u00a0\u00a0 && echo\r\n fi\r\n else\r\n echo \"missing one of debug32\/debug64\/opt32\/opt64\"\r\n fi\r\n}<\/pre>\n