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re PR rtl-optimization/79593 (Poor/Worse code generation for FPU on versions after 6) 

PR target/79593
	* config/i386/i386.md (standard_x87sse_constant_load splitter):
	Use nonimmediate_operand instead of memory_operand for operand 1.
	(float-extend standard_x87sse_constant_load splitter): Ditto.

testsuite/ChangeLog:

	PR target/79593
	* gcc.target/i386/pr79593.c: New test.

From-SVN: r245640
This commit is contained in:
Uros Bizjak 2017-02-21 19:29:57 +01:00
parent b7280ac270
commit a2b48844ed
2 changed files with 19 additions and 2 deletions
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4
gcc/config/i386/i386.md
View File

@ -3660,7 +3660,7 @@
(define_split
[(set (match_operand 0 "any_fp_register_operand")
(match_operand 1 "memory_operand"))]
(match_operand 1 "nonimmediate_operand"))]
"reload_completed
&& (GET_MODE (operands[0]) == TFmode
|| GET_MODE (operands[0]) == XFmode
@ -3672,7 +3672,7 @@
(define_split
[(set (match_operand 0 "any_fp_register_operand")
(float_extend (match_operand 1 "memory_operand")))]
(float_extend (match_operand 1 "nonimmediate_operand")))]
"reload_completed
&& (GET_MODE (operands[0]) == TFmode
|| GET_MODE (operands[0]) == XFmode

17
gcc/testsuite/gcc.target/i386/pr79593.c Normal file
View File

@ -0,0 +1,17 @@
/* PR target/79593 */
/* { dg-do compile } */
/* { dg-options "-Ofast -mfpmath=387" } */
extern float global_data[1024];
static long double MIN (long double a, long double b) { return a < b ? a : b; }
static long double MAX (long double a, long double b) { return a > b ? a : b; }
float bar (void)
{
long double delta = (global_data[0]);
return (MIN (MAX (delta, 0.0l), 1.0l));
}
/* { dg-final { scan-assembler-not "fld\[ \t\]+%st" } } */