https://gcc.gnu.org/g:3c3f8727179681e80cf28e57bbdb18f672c2e8d1
commit 3c3f8727179681e80cf28e57bbdb18f672c2e8d1
Author: Michael Meissner <meiss...@linux.ibm.com>
Date: Mon Jul 15 13:13:06 2024 -0400
Update ChangeLog.*
Diff:
---
gcc/ChangeLog.bugs | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/gcc/ChangeLog.bugs b/gcc/ChangeLog.bugs
index 076ccebfc45e..5b1df025f236 100644
--- a/gcc/ChangeLog.bugs
+++ b/gcc/ChangeLog.bugs
@@ -1,3 +1,51 @@
+==================== Branch work171-bugs, patch #320 ====================
+
+Do not add -mvsx when building or testing the float128 support.
+
+In the past, we would add -mvsx when building the float128 support in libgcc.
+This allowed us to build the float128 support on a big endian system where the
+default cpu is power4. While the libgcc support can be built, given there is
no
+glibc support for float128 available.
+
+However, adding -mvsx and building the libgcc float128 support causes problems
+if you set the default cpu to something like a 7540, which does not have VSX
+support. The assembler complains that when the code does a ".machine 7450",
you
+cannot use VSX instructions.
+
+With these patches, the float128 libgcc support is only built if the default
+compiler has VSX support. If somebody wanted to enable the glibc support for
+big endian, they would need to set the base cpu to power8 to enable building
the
+libgcc float128 libraries.
+
+In addition to the changes in libgcc, this patch also changes the GCC tests so
+that it will only test float128 if the default compiler enables the VSX
+instruction set. Otherwise all of the float128 tests will fail because the
+libgcc support is not available.
+
+2024-07-15 Michael Meissner <meiss...@linux.ibm.com>
+
+gcc/testsuite/
+
+ PR target/115800
+ PR target/113652
+ * lib/target-supports.exp (check_ppc_float128_sw_available): Do not add
+ the -mvsx option.
+ (check_effective_target___float128): Likewise.
+
+libgcc/
+
+ PR target/115800
+ PR target/113652
+ * config.host (powerpc*-*-linux*): Do not add t-float128-hw or
+ t-float128-p10-hw if the default compiler does not support float128.
+ * config/rs6000/t-float128 (FP128_CFLAGS_SW): Do not add -mvsx when
+ building the basic float128 support.
+ * config/rs6000/t-float128-hw (FP128_CFLAGS_HW): Likewise.
+ * config/rs6000/t-float128-p10-hw (FP128_3_1_CFLAGS_HW): Likewise.
+ * configure.ac (powerpc*-*-linux*): Do not add -mvsx when testing
+ whether to build the float128 support.
+ * configure: Regenerate.
+
==================== Branch work171-bugs, patch #311 was reverted
====================
==================== Branch work171-bugs, patch #310 was reverted
====================
==================== Branch work171-bugs, patch #304 was reverted
====================
