From 1b885264a48dcd71b7aeb26c0abeb91246724897 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Thu, 7 Jan 2021 14:27:49 -0800 Subject: [PATCH] x86-64: Use R10 for profiling large model R10 is caller-saved. Although it can be used as a static chain register, it is preserved when calling mcount for nested functions. Use R10 as a scratch register to call mcount in large model. gcc/ PR target/98482 * config/i386/i386.c (x86_function_profiler): Use R10 to call mcount in large model. Sorry for large model with PIC. gcc/testsuite/ PR target/98482 * gcc.target/i386/pr98482-1.c: New test. * gcc.target/i386/pr98482-1.c: Likewise. --- gcc/config/i386/i386.c | 26 +++++++++++++++++++++-- gcc/testsuite/gcc.target/i386/pr98482-1.c | 9 ++++++++ gcc/testsuite/gcc.target/i386/pr98482-2.c | 9 ++++++++ 3 files changed, 42 insertions(+), 2 deletions(-) create mode 100644 gcc/testsuite/gcc.target/i386/pr98482-1.c create mode 100644 gcc/testsuite/gcc.target/i386/pr98482-2.c diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index fad50e7e537..d3068462fcd 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -20794,8 +20794,30 @@ x86_function_profiler (FILE *file, int labelno ATTRIBUTE_UNUSED) fprintf (file, "\tleaq\t%sP%d(%%rip),%%r11\n", LPREFIX, labelno); #endif - if (!TARGET_PECOFF && flag_pic) - fprintf (file, "1:\tcall\t*%s@GOTPCREL(%%rip)\n", mcount_name); + if (!TARGET_PECOFF) + { + switch (ix86_cmodel) + { + case CM_LARGE: + /* NB: R10 is caller-saved. Although it can be used as a + static chain register, it is preserved when calling + mcount for nested functions. */ + fprintf (file, "1:\tmovabsq\t$%s, %%r10\n\tcall\t*%%r10\n", + mcount_name); + break; + case CM_LARGE_PIC: + sorry ("profiling %<-mcmodel=large%> with PIC is not supported"); + break; + case CM_SMALL_PIC: + case CM_MEDIUM_PIC: + fprintf (file, "1:\tcall\t*%s@GOTPCREL(%%rip)\n", + mcount_name); + break; + default: + x86_print_call_or_nop (file, mcount_name); + break; + } + } else x86_print_call_or_nop (file, mcount_name); } diff --git a/gcc/testsuite/gcc.target/i386/pr98482-1.c b/gcc/testsuite/gcc.target/i386/pr98482-1.c new file mode 100644 index 00000000000..72d5ccb269c --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr98482-1.c @@ -0,0 +1,9 @@ +/* { dg-do compile { target { *-*-linux* && { ! ia32 } } } } */ +/* { dg-require-effective-target mfentry } */ +/* { dg-options "-fprofile -mfentry -O2 -mcmodel=large" } */ +/* { dg-final { scan-assembler "movabsq\t\\\$__fentry__, %r10\n\tcall\t\\*%r10" } } */ + +void +func (void) +{ +} diff --git a/gcc/testsuite/gcc.target/i386/pr98482-2.c b/gcc/testsuite/gcc.target/i386/pr98482-2.c new file mode 100644 index 00000000000..aed3ca4b6ff --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr98482-2.c @@ -0,0 +1,9 @@ +/* { dg-do compile { target { *-*-linux* && { ! ia32 } } } } */ +/* { dg-require-effective-target mfentry } */ +/* { dg-require-effective-target fpic } */ +/* { dg-options "-fpic -fprofile -mfentry -O2 -mcmodel=large" } */ + +void +func (void) +{ +} /* { dg-message "sorry, unimplemented: profiling '-mcmodel=large' with PIC is not supported" } */ -- 2.30.2