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testcase for 2-2 combine

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gcc/testsuite/
	PR rtl-optimization/85160
	* gcc.target/powerpc/combine-2-2.c: New testcase.

From-SVN: r263072
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Segher Boessenkool 2018-07-30 18:11:44 +02:00 committed by Segher Boessenkool
parent fd5d859302
commit 81bdfc1e29
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gcc/testsuite/ChangeLog
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2018-07-30 Segher Boessenkool <segher@kernel.crashing.org>
PR rtl-optimization/85160
* gcc.target/powerpc/combine-2-2.c: New testcase.
2018-07-27 Martin Sebor <msebor@redhat.com>
PR tree-optimization/86696

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gcc/testsuite/gcc.target/powerpc/combine-2-2.c Normal file
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/* { dg-options "-O2" } */
/* PR85160 */
/* Originally, the "x >> 14" are CSEd away (eventually becoming a srawi
instruction), and the two ANDs remain separate instructions because
combine cannot deal with this.
Now that combine knows how to combine two RTL insns into two, it manages
to make this just the sum of two rlwinm instructions. */
int f(int x)
{
return ((x >> 14) & 6) + ((x >> 14) & 4);
}
/* { dg-final { scan-assembler-not {\msrawi\M} } } */