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42 lines
1.0 KiB
42 lines
1.0 KiB
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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