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| author | qing zhao <qinzhao@gcc.gnu.org> | 2020-11-05 15:57:46 +0100 |
|---|---|---|
| committer | qing zhao <qinzhao@gcc.gnu.org> | 2020-11-05 15:57:46 +0100 |
| commit | cc32e81cdbb7696cd571bdb5ffe52f228f125df5 (patch) | |
| tree | dd80526f8e3f10c246b2eda160fb18daae2a46a4 /gcc | |
| parent | 54cbdb528df16686290ad26e2130a1896915639d (diff) | |
| download | gcc-cc32e81cdbb7696cd571bdb5ffe52f228f125df5.zip gcc-cc32e81cdbb7696cd571bdb5ffe52f228f125df5.tar.gz gcc-cc32e81cdbb7696cd571bdb5ffe52f228f125df5.tar.bz2 | |
i386: Fix PR97715
This change fixes a bug in the i386 backend when adding
-fzero-call-used-regs=all on a target that has no x87
registers.
When there is no x87 registers available, we should not
zero stack registers.
gcc/ChangeLog:
PR target/97715
* config/i386/i386.c (zero_all_st_registers): Return
earlier when the FPU is disabled.
gcc/testsuite/ChangeLog:
PR target/97715
* gcc.target/i386/zero-scratch-regs-32.c: New test.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/i386/i386.c | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/zero-scratch-regs-32.c | 11 |
2 files changed, 16 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 6fc6228..789ef72 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -3640,6 +3640,11 @@ zero_all_vector_registers (HARD_REG_SET need_zeroed_hardregs) static bool zero_all_st_registers (HARD_REG_SET need_zeroed_hardregs) { + + /* If the FPU is disabled, no need to zero all st registers. */ + if (! (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387)) + return false; + unsigned int num_of_st = 0; for (unsigned int regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) if ((STACK_REGNO_P (regno) || MMX_REGNO_P (regno)) diff --git a/gcc/testsuite/gcc.target/i386/zero-scratch-regs-32.c b/gcc/testsuite/gcc.target/i386/zero-scratch-regs-32.c new file mode 100644 index 0000000..ca3261f --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/zero-scratch-regs-32.c @@ -0,0 +1,11 @@ +/* { dg-do compile { target *-*-linux* } } */ +/* { dg-options "-O2 -fzero-call-used-regs=all -mno-80387" } */ + +int +foo (int x) +{ + return (x + 1); +} + +/* { dg-final { scan-assembler-not "fldz" } } */ + |