rs6000.h (TARGET_EFFICIENT_OVERLAPPING_UNALIGNED): Add macro to say we can efficiently handle overlapping unaligned loads.
2016-10-09 Aaron Sawdey <acsawdey@linux.vnet.ibm.com> * config/rs6000/rs6000.h (TARGET_EFFICIENT_OVERLAPPING_UNALIGNED): Add macro to say we can efficiently handle overlapping unaligned loads. * config/rs6000/rs6000.c (expand_block_compare): Avoid generating poor code for processors older than p8. From-SVN: r240908
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2016-10-09 Aaron Sawdey <acsawdey@linux.vnet.ibm.com>
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* config/rs6000/rs6000.h (TARGET_EFFICIENT_OVERLAPPING_UNALIGNED):
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Add macro to say we can efficiently handle overlapping unaligned
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loads.
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* config/rs6000/rs6000.c (expand_block_compare): Avoid generating
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poor code for processors older than p8.
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2016-10-09 Eric Botcazou <ebotcazou@adacore.com>
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* gen-pass-instances.awk: Remove GNUism.
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@ -18771,6 +18771,14 @@ expand_block_compare (rtx operands[])
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if (bytes <= 0)
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return true;
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/* The code generated for p7 and older is not faster than glibc
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memcmp if alignment is small and length is not short, so bail
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out to avoid those conditions. */
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if (!TARGET_EFFICIENT_OVERLAPPING_UNALIGNED
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&& ((base_align == 1 && bytes > 16)
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|| (base_align == 2 && bytes > 32)))
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return false;
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rtx tmp_reg_src1 = gen_reg_rtx (word_mode);
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rtx tmp_reg_src2 = gen_reg_rtx (word_mode);
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@ -18820,13 +18828,18 @@ expand_block_compare (rtx operands[])
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while (bytes > 0)
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{
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int align = compute_current_alignment (base_align, offset);
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load_mode = select_block_compare_mode(offset, bytes, align, word_mode_ok);
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if (TARGET_EFFICIENT_OVERLAPPING_UNALIGNED)
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load_mode = select_block_compare_mode (offset, bytes, align,
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word_mode_ok);
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else
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load_mode = select_block_compare_mode (0, bytes, align, word_mode_ok);
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load_mode_size = GET_MODE_SIZE (load_mode);
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if (bytes >= load_mode_size)
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cmp_bytes = load_mode_size;
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else
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else if (TARGET_EFFICIENT_OVERLAPPING_UNALIGNED)
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{
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/* Move this load back so it doesn't go past the end. */
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/* Move this load back so it doesn't go past the end.
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P8/P9 can do this efficiently. */
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int extra_bytes = load_mode_size - bytes;
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cmp_bytes = bytes;
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if (extra_bytes < offset)
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@ -18836,6 +18849,11 @@ expand_block_compare (rtx operands[])
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bytes = cmp_bytes;
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}
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}
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else
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/* P7 and earlier can't do the overlapping load trick fast,
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so this forces a non-overlapping load and a shift to get
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rid of the extra bytes. */
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cmp_bytes = bytes;
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src1 = adjust_address (orig_src1, load_mode, offset);
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src2 = adjust_address (orig_src2, load_mode, offset);
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@ -607,6 +607,9 @@ extern int rs6000_vector_align[];
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&& TARGET_POWERPC64)
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#define TARGET_VEXTRACTUB (TARGET_P9_VECTOR && TARGET_DIRECT_MOVE \
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&& TARGET_UPPER_REGS_DI && TARGET_POWERPC64)
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/* This wants to be set for p8 and newer. On p7, overlapping unaligned
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loads are slow. */
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#define TARGET_EFFICIENT_OVERLAPPING_UNALIGNED TARGET_EFFICIENT_UNALIGNED_VSX
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/* Byte/char syncs were added as phased in for ISA 2.06B, but are not present
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in power7, so conditionalize them on p8 features. TImode syncs need quad
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