The patch caused regressions in gcc.target/sh/pr64345-1.c on
sh3-linux-gnu and gcc.target/m68k/pr39726.c on m68k-linux-gnu.
It didn't look like they would be fixable in an acceptably
non-invasive and unhacky way, so punting till future releases.
2020-01-29 Richard Sandiford <richard.sandiford@arm.com>
gcc/
Revert:
2020-01-28 Richard Sandiford <richard.sandiford@arm.com>
PR rtl-optimization/87763
* simplify-rtx.c (simplify_truncation): Extend sign/zero_extract
simplification to handle subregs as well as bare regs.
* config/i386/i386.md (*testqi_ext_3): Match QI extracts too.
