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(parent: e7e785d) | patch
x86: Add gcc.target/i386/strncmp-1.c
authorH.J. Lu <hjl.tools@gmail.com>
Sun, 17 May 2020 13:52:02 +0000 (06:52 -0700)
committerH.J. Lu <hjl.tools@gmail.com>
Sun, 17 May 2020 13:52:14 +0000 (06:52 -0700)
commitcc558e28014f0d85247398c89e7cf75d92df1bd3
treea118dc18e40c36e892c820e9ff756e1ca194ae14tree
parente7e785dfec360573c2e8a700ef570a22359410c5commit | diff
x86: Add gcc.target/i386/strncmp-1.c

Add a strncmp test for the cmpstrn pattern with neither of the strings
is a constant string.  We can expand the cmpstrn pattern to "repz cmpsb"
only if one of the strings is a constant so that expand_builtin_strncmp()
can write the length argument to be the minimum of the const string
length and the actual length argument.  Otherwise, "repz cmpsb" may pass
the 0 byte.

* gcc.target/i386/strncmp-1.c: New test.
gcc/testsuite/ChangeLog diff | blob | history
gcc/testsuite/gcc.target/i386/strncmp-1.c [new file with mode: 0644] blob