On Linux/x86_64,

6b14100b9504800768da726dcb81f1857db3b493 is the first bad commit
commit 6b14100b9504800768da726dcb81f1857db3b493
Author: Francois-Xavier Coudert <fxcoud...@gmail.com>
Date:   Wed Jan 12 11:19:37 2022 +0100

    Fortran: fix testcase compiler flags

caused

FAIL: gfortran.dg/ieee/signaling_1.f90   -O0  execution test
FAIL: gfortran.dg/ieee/signaling_1.f90   -O1  execution test
FAIL: gfortran.dg/ieee/signaling_1.f90   -O2  execution test
FAIL: gfortran.dg/ieee/signaling_1.f90   -O3 -fomit-frame-pointer 
-funroll-loops -fpeel-loops -ftracer -finline-functions  execution test
FAIL: gfortran.dg/ieee/signaling_1.f90   -O3 -g  execution test
FAIL: gfortran.dg/ieee/signaling_1.f90   -Os  execution test

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-6517/usr 
--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld 
--with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl 
--enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/signaling_1.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/signaling_1.f90 
--target_board='unix{-m32\ -march=cascadelake}'"

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