[Bug target/53513] [SH] Add support for fschg and fpchg insns and improve fenv support

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53513

--- Comment #18 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #15)
> Created attachment 33691 [details]
> a possible patch
> 
> The previous patch was buggy, it always generated a PR toggle sequence, even
> if a mode should be set directly.

I've tested the patch, there are some new failures:

-m4 -mb:
FAIL: g++.dg/torture/type-generic-1.C   -O0  execution test
FAIL: gcc.c-torture/execute/builtins/complex-1.c execution,  -O0 
FAIL: gcc.c-torture/execute/builtins/complex-1.c execution,  -Og -g 
FAIL: gcc.c-torture/execute/complex-6.c   -O0  execution test
FAIL: gcc.c-torture/execute/gofast.c   -O0  execution test
FAIL: gcc.c-torture/execute/ieee/20010114-2.c execution,  -O0 
FAIL: gcc.c-torture/execute/ieee/20010114-2.c execution,  -O1 
FAIL: gcc.c-torture/execute/ieee/20010114-2.c execution,  -Og -g 
FAIL: gcc.c-torture/execute/ieee/20030331-1.c execution,  -O0 
FAIL: gcc.c-torture/execute/ieee/copysign1.c execution,  -O0 
FAIL: gcc.c-torture/execute/ieee/mzero3.c execution,  -O0 
FAIL: gcc.dg/torture/type-generic-1.c   -O0  execution test

-m4 -ml:
FAIL: g++.dg/torture/type-generic-1.C   -O0  execution test
FAIL: g++.dg/torture/type-generic-1.C   -O1  execution test
FAIL: g++.dg/torture/type-generic-1.C   -O2  execution test
FAIL: g++.dg/torture/type-generic-1.C   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
FAIL: g++.dg/torture/type-generic-1.C   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
FAIL: g++.dg/torture/type-generic-1.C   -O3 -fomit-frame-pointer  execution
test
FAIL: g++.dg/torture/type-generic-1.C   -O3 -g  execution test
FAIL: g++.dg/torture/type-generic-1.C   -Os  execution test
FAIL: gcc.c-torture/execute/builtins/complex-1.c execution,  -O0 
FAIL: gcc.c-torture/execute/builtins/complex-1.c execution,  -Og -g 
FAIL: gcc.c-torture/execute/complex-6.c   -O0  execution test
FAIL: gcc.c-torture/execute/conversion.c   -O0  execution test
FAIL: gcc.c-torture/execute/gofast.c   -O0  execution test
FAIL: gcc.c-torture/execute/ieee/20010114-2.c execution,  -O0 
FAIL: gcc.c-torture/execute/ieee/20010114-2.c execution,  -O1 
FAIL: gcc.c-torture/execute/ieee/20010114-2.c execution,  -Og -g 
FAIL: gcc.c-torture/execute/ieee/20030331-1.c execution,  -O0 
FAIL: gcc.c-torture/execute/ieee/copysign1.c execution,  -O0 
FAIL: gcc.c-torture/execute/ieee/mzero3.c execution,  -O0 
FAIL: gcc.dg/pr28796-2.c execution test
FAIL: gcc.dg/torture/fp-int-convert-float.c   -O0  execution test
FAIL: gcc.dg/torture/fp-int-convert-float.c   -O1  execution test
FAIL: gcc.dg/torture/fp-int-convert-float.c   -O2  execution test
FAIL: gcc.dg/torture/fp-int-convert-float.c   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
FAIL: gcc.dg/torture/fp-int-convert-float.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
FAIL: gcc.dg/torture/fp-int-convert-float.c   -O3 -fomit-frame-pointer 
execution test
FAIL: gcc.dg/torture/fp-int-convert-float.c   -O3 -g  execution test
FAIL: gcc.dg/torture/fp-int-convert-float.c   -Os  execution test
FAIL: gcc.dg/torture/type-generic-1.c   -O0  execution test
FAIL: gcc.dg/torture/type-generic-1.c   -O1  execution test
FAIL: gcc.dg/torture/type-generic-1.c   -O2  execution test
FAIL: gcc.dg/torture/type-generic-1.c   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
FAIL: gcc.dg/torture/type-generic-1.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
FAIL: gcc.dg/torture/type-generic-1.c   -O3 -fomit-frame-pointer  execution
test
FAIL: gcc.dg/torture/type-generic-1.c   -O3 -g  execution test
FAIL: gcc.dg/torture/type-generic-1.c   -Os  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O0  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O1  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O2  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O3 -fomit-frame-pointer  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -O3 -g  execution test
FAIL: gcc.dg/torture/vec-cvt-1.c   -Os  execution test