When compiling with `-msoft-float -mfpmath=387`, `-msoft-float` turns off 387.
With neither FPMATH_SSE nor FPMATH_387 enabled, no unit can do FP arithmetics.
The i386-options.cc omits this kind of check, so ICE is triggered. We need
to add check in i386-options.cc to cover FPMATH_387 scenario when FPMATH_SSE
is false.
gcc/ChangeLog:
PR target/119300
* config/i386/i386-options.cc (ix86_option_override_internal): Add
check for
FPMATH_SSE == 0 scenario to enable 387 (if available).
gcc/testsuite/ChangeLog:
PR target/119300
* gcc.target/i386/pr119300.c: New test.
---
gcc/config/i386/i386-options.cc | 13 +++++++++++++
gcc/testsuite/gcc.target/i386/pr119300.c | 10 ++++++++++
2 files changed, 23 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/i386/pr119300.c
diff --git a/gcc/config/i386/i386-options.cc b/gcc/config/i386/i386-options.cc
index 480862c7134..67c73d2ec6a 100644
--- a/gcc/config/i386/i386-options.cc
+++ b/gcc/config/i386/i386-options.cc
@@ -2823,6 +2823,19 @@ ix86_option_override_internal (bool main_args_p,
opts->x_ix86_fpmath = FPMATH_SSE;
}
}
+ else if (opts->x_ix86_fpmath & FPMATH_387)
+ {
+ if (!TARGET_80387_P (opts->x_target_flags))
+ {
+ if (TARGET_SSE_P (opts->x_ix86_isa_flags))
+ {
+ warning (0, "387 instruction set disabled, using SSE
arithmetics");
+ opts->x_ix86_fpmath = FPMATH_SSE;
+ }
+ else
+ error ("387 and SSE instruction sets disabled, no FP math
units");
+ }
+ }
}
/* For all chips supporting SSE2, -mfpmath=sse performs better than
fpmath=387. The second is however default at many targets since the
diff --git a/gcc/testsuite/gcc.target/i386/pr119300.c
b/gcc/testsuite/gcc.target/i386/pr119300.c
new file mode 100644
index 00000000000..a2490219e5f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr119300.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-msoft-float -mfpmath=387" } */
+
+float
+foo (float f)
+{
+ return __builtin_ia32_rsqrtf (f);
+}
+
+/* { dg-warning "387 instruction set disabled, using SSE arithmetics" "" {
target *-*-* } 0 } */
--
2.25.1
