diff options
| -rw-r--r-- | gcc/config/i386/i386.c | 12 | ||||
| -rw-r--r-- | gcc/config/i386/i386.h | 2 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/pr95740.c | 26 |
3 files changed, 38 insertions, 2 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index ccb57af..52547b0 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -19214,9 +19214,17 @@ ix86_preferred_reload_class (rtx x, reg_class_t regclass) return NO_REGS; } - /* Prefer SSE regs only, if we can use them for math. */ + /* Prefer SSE if we can use them for math. Also allow integer regs + when moves between register units are cheap. */ if (SSE_FLOAT_MODE_P (mode) && TARGET_SSE_MATH) - return SSE_CLASS_P (regclass) ? regclass : NO_REGS; + { + if (TARGET_INTER_UNIT_MOVES_FROM_VEC + && TARGET_INTER_UNIT_MOVES_TO_VEC + && GET_MODE_SIZE (mode) <= GET_MODE_SIZE (word_mode)) + return INT_SSE_CLASS_P (regclass) ? regclass : NO_REGS; + else + return SSE_CLASS_P (regclass) ? regclass : NO_REGS; + } /* Generally when we see PLUS here, it's the function invariant (plus soft-fp const_int). Which can only be computed into general diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h index 4f70085..46fdd6e 100644 --- a/gcc/config/i386/i386.h +++ b/gcc/config/i386/i386.h @@ -1279,6 +1279,8 @@ enum reg_class reg_class_subset_p ((CLASS), FLOAT_REGS) #define SSE_CLASS_P(CLASS) \ reg_class_subset_p ((CLASS), ALL_SSE_REGS) +#define INT_SSE_CLASS_P(CLASS) \ + reg_class_subset_p ((CLASS), INT_SSE_REGS) #define MMX_CLASS_P(CLASS) \ ((CLASS) == MMX_REGS) #define MASK_CLASS_P(CLASS) \ diff --git a/gcc/testsuite/gcc.target/i386/pr95740.c b/gcc/testsuite/gcc.target/i386/pr95740.c new file mode 100644 index 0000000..7ecd71b --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr95740.c @@ -0,0 +1,26 @@ +/* { dg-do compile { target { ! ia32 } } } */ +/* { dg-options "-msse2 -O2 -mtune=generic -mtune-ctrl=use_incdec -masm=att -mfpmath=sse" } */ +/* { dg-final { scan-assembler-times {(?n)movd[\t ]*%xmm0.*%eax} 1 } } */ +/* { dg-final { scan-assembler-times {(?n)incl[\t ]*%eax} 1 } } */ +/* { dg-final { scan-assembler-times {(?n)movq[\t ]*%xmm0.*%rax} 1 } } */ +/* { dg-final { scan-assembler-times {(?n)incq[\t ]*%rax} 1 } } */ + +int +foo (float a) +{ + union{ + int b; + float a;}u; + u.a = a; + return u.b + 1; +} + +long long +foo1 (double a) +{ + union{ + long long b; + double a;}u; + u.a = a; + return u.b + 1; +} |