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re PR rtl-optimization/42475 (ICE at -O1 and above: internal compiler error: in simplify_subreg, at simplify-rtx.c:4954) 

PR rtl-optimization/42475
	* combine.c (make_compound_operation) <case SUBREG>: Use mode of
	SUBREG_REG (x) instead of tem's mode.

	* gcc.dg/pr42475.c: New test.

From-SVN: r155431
This commit is contained in:
Jakub Jelinek 2009-12-23 18:07:04 +01:00 committed by Jakub Jelinek
parent e9ede1fe85
commit 37d00b277c
4 changed files with 42 additions and 4 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2009-12-23 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/42475
* combine.c (make_compound_operation) <case SUBREG>: Use mode of
SUBREG_REG (x) instead of tem's mode.
2009-12-21 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/42429

7
gcc/combine.c
View File

@ -7039,15 +7039,14 @@ make_compound_operation (rtx x, enum rtx_code in_code)
tem = make_compound_operation (SUBREG_REG (x), in_code);
{
rtx simplified;
simplified = simplify_subreg (GET_MODE (x), tem, GET_MODE (tem),
SUBREG_BYTE (x));
rtx simplified = simplify_subreg (mode, tem, GET_MODE (SUBREG_REG (x)),
SUBREG_BYTE (x));
if (simplified)
tem = simplified;
if (GET_CODE (tem) != GET_CODE (SUBREG_REG (x))
&& GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (tem))
&& GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))
&& subreg_lowpart_p (x))
{
rtx newer = force_to_mode (tem, mode, ~(HOST_WIDE_INT) 0,

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2009-12-23 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/42475
* gcc.dg/pr42475.c: New test.
2009-12-22 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline:

28
gcc/testsuite/gcc.dg/pr42475.c Normal file
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@ -0,0 +1,28 @@
/* PR rtl-optimization/42475 */
/* { dg-do compile } */
/* { dg-options "-O2" } */
typedef struct { float x, y; } B;
typedef struct { float z; } C;
typedef struct { B b; C c; } D;
B
foo (float x, float y)
{
B b = { .x = x, .y = y };
return b;
}
B
bar (B b, B y)
{
return foo (y.x + b.x, b.y);
}
B
baz (D p)
{
D d = { };
B y = bar (foo (0, (p.c.z) / 2), d.b);
return y;
}