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Fix for PR 91333 - suboptimal register allocation for inline asm

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2020-01-31  Vladimir Makarov  <vmakarov@redhat.com>

            PR rtl-optimization/91333
            * ira-color.c (bucket_allocno_compare_func): Move conflict hard
            reg preferences comparison up.

    2020-01-31  Vladimir Makarov  <vmakarov@redhat.com>

            PR rtl-optimization/91333
            * gcc.target/i386/pr91333.c: New.
This commit is contained in:
Vladimir N. Makarov 2020-01-31 14:26:26 -05:00
parent f1c807e887
commit 2a07345c4f
4 changed files with 30 additions and 5 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2020-01-31 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/91333
* ira-color.c (bucket_allocno_compare_func): Move conflict hard
reg preferences comparison up.
2020-01-31 Richard Sandiford <richard.sandiford@arm.com>
* config/aarch64/aarch64.h (TARGET_SVE_BF16): New macro.

10
gcc/ira-color.c
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@ -2251,6 +2251,11 @@ bucket_allocno_compare_func (const void *v1p, const void *v2p)
ira_allocno_t t2 = ALLOCNO_COLOR_DATA (a2)->first_thread_allocno;
int cl1 = ALLOCNO_CLASS (a1), cl2 = ALLOCNO_CLASS (a2);
/* Push allocnos with minimal conflict_allocno_hard_prefs first. */
pref1 = ALLOCNO_COLOR_DATA (a1)->conflict_allocno_hard_prefs;
pref2 = ALLOCNO_COLOR_DATA (a2)->conflict_allocno_hard_prefs;
if ((diff = pref1 - pref2) != 0)
return diff;
freq1 = ALLOCNO_COLOR_DATA (t1)->thread_freq;
freq2 = ALLOCNO_COLOR_DATA (t2)->thread_freq;
if ((diff = freq1 - freq2) != 0)
@ -2276,11 +2281,6 @@ bucket_allocno_compare_func (const void *v1p, const void *v2p)
a2_num = ALLOCNO_COLOR_DATA (a2)->available_regs_num;
if ((diff = a2_num - a1_num) != 0)
return diff;
/* Push allocnos with minimal conflict_allocno_hard_prefs first. */
pref1 = ALLOCNO_COLOR_DATA (a1)->conflict_allocno_hard_prefs;
pref2 = ALLOCNO_COLOR_DATA (a2)->conflict_allocno_hard_prefs;
if ((diff = pref1 - pref2) != 0)
return diff;
return ALLOCNO_NUM (a2) - ALLOCNO_NUM (a1);
}

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2020-01-31 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/91333
* gcc.target/i386/pr91333.c: New.
2020-01-31 David Malcolm <dmalcolm@redhat.com>
PR analyzer/93379

14
gcc/testsuite/gcc.target/i386/pr91333.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile { target x86_64-*-* } } */
/* { dg-options "-O2 -mavx" } */
/* { dg-final { scan-assembler-times "vmovapd" 2 } } */
static inline double g (double x){
asm volatile ("" : "+x" (x));
return x;
}
static inline double f (double a, double b){
return g (g (a) + g (b));
}
double h (double a, double b){
return f (f (a, a), f (b, b));
}