Blame SOURCES/gcc48-pr78378.patch
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2017-05-30 Jakub Jelinek <jakub@redhat.com>
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Backported from mainline
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2016-11-16 Jakub Jelinek <jakub@redhat.com>
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PR rtl-optimization/78378
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* combine.c (make_extraction): Use force_to_mode for non-{REG,MEM}
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inner only if pos is 0.
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* gcc.c-torture/execute/pr78378.c: New test.
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--- gcc/combine.c
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+++ gcc/combine.c
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@@ -7342,6 +7342,7 @@ make_extraction (machine_mode mode, rtx inner, HOST_WIDE_INT pos,
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if (tmode != BLKmode
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&& ((pos_rtx == 0 && (pos % BITS_PER_WORD) == 0
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&& !MEM_P (inner)
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+ && (pos == 0 || REG_P (inner))
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&& (inner_mode == tmode
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|| !REG_P (inner)
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|| TRULY_NOOP_TRUNCATION_MODES_P (tmode, inner_mode)
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--- /dev/null
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+++ gcc/testsuite/gcc.c-torture/execute/pr78378.c
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@@ -0,0 +1,18 @@
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+/* PR rtl-optimization/78378 */
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+
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+unsigned long long __attribute__ ((noinline, noclone))
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+foo (unsigned long long x)
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+{
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+ x <<= 41;
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+ x /= 232;
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+ return 1 + (unsigned short) x;
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+}
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+
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+int
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+main ()
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+{
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+ unsigned long long x = foo (1);
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+ if (x != 0x2c24)
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+ __builtin_abort();
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+ return 0;
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+}
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