S390: Improve comments for s390-tdbregs test case
This adds more explanation as to why the test case must be compiled with the -msoft-float option. It also documents the my_tbegin and my_tend functions. gdb/testsuite/ChangeLog: * gdb.arch/s390-tdbregs.c (my_tbegin): Add comment documenting the function. (my_tend): Likewise. * gdb.arch/s390-tdbregs.exp: Enhance comment; explain the rationale of avoiding FP- and vector instructions.
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@ -1,3 +1,11 @@
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2018-01-19 Andreas Arnez <arnez@linux.vnet.ibm.com>
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* gdb.arch/s390-tdbregs.c (my_tbegin): Add comment documenting the
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function.
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(my_tend): Likewise.
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* gdb.arch/s390-tdbregs.exp: Enhance comment; explain the
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rationale of avoiding FP- and vector instructions.
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2018-01-19 Ruslan Kabatsayev <b7.10110111@gmail.com>
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2018-01-19 Ruslan Kabatsayev <b7.10110111@gmail.com>
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* gdb.arch/powerpc-d128-regs.exp: Replace expected "\[\t\]*" from
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* gdb.arch/powerpc-d128-regs.exp: Replace expected "\[\t\]*" from
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@ -17,6 +17,13 @@
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#include <stdio.h>
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#include <stdio.h>
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/* Start a transaction. To avoid the need for FPR save/restore, assume
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that no FP- or vector registers are modified within the transaction.
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Thus invoke TBEGIN with the "allow floating-point operation" flag set
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to zero, which forces a transaction abort when hitting an FP- or vector
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instruction. Also assume that TBEGIN will eventually succeed, so just
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retry indefinitely. */
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static void
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static void
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my_tbegin ()
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my_tbegin ()
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{
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{
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@ -28,6 +35,8 @@ my_tbegin ()
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: "cc", "memory" );
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: "cc", "memory" );
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}
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}
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/* End a transaction. */
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static void
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static void
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my_tend ()
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my_tend ()
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{
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{
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@ -26,8 +26,10 @@ if { ![istarget s390-*-*] && ![istarget s390x-*-* ] } {
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standard_testfile .c
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standard_testfile .c
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# Use soft float, so the compiler doesn't use floating-point or vector
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# The test case assumes that no FP- or vector instructions occur within
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# instructions.
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# the transaction. Thus tell the compiler to use soft float, so it
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# doesn't emit them. Some GCC versions may otherwise do so, and an
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# endless loop would result.
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if { [prepare_for_testing "failed to prepare" $testfile $srcfile \
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if { [prepare_for_testing "failed to prepare" $testfile $srcfile \
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[list "debug" "additional_flags=-msoft-float"]] } {
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[list "debug" "additional_flags=-msoft-float"]] } {
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return -1
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return -1
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