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aarch64: Fix BE SVE mode punning involving floats 

The patterns used by aarch64_split_sve_subreg_move only support
integer modes, so if the widest mode is a float, we should get
its integer equivalent.

Fixes gcc.target/aarch64/sel_3.c for big-endian targets.

2020-01-16  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/aarch64.c (aarch64_split_sve_subreg_move): Apply
	aarch64_sve_int_mode to each mode.
This commit is contained in:
Richard Sandiford 2020-01-15 16:52:04 +00:00
parent c35a304624
commit 5c06093ce9
2 changed files with 7 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2020-01-16 Richard Sandiford <richard.sandiford@arm.com>
* config/aarch64/aarch64.c (aarch64_split_sve_subreg_move): Apply
aarch64_sve_int_mode to each mode.
2020-01-15 David Malcolm <dmalcolm@redhat.com>
* doc/analyzer.texi (Overview): Add note about

4
gcc/config/aarch64/aarch64.c
View File

@ -4827,8 +4827,8 @@ aarch64_split_sve_subreg_move (rtx dest, rtx ptrue, rtx src)
/* Decide which REV operation we need. The mode with wider elements
determines the mode of the operands and the mode with the narrower
elements determines the reverse width. */
machine_mode mode_with_wider_elts = GET_MODE (dest);
machine_mode mode_with_narrower_elts = GET_MODE (src);
machine_mode mode_with_wider_elts = aarch64_sve_int_mode (GET_MODE (dest));
machine_mode mode_with_narrower_elts = aarch64_sve_int_mode (GET_MODE (src));
if (GET_MODE_UNIT_SIZE (mode_with_wider_elts)
< GET_MODE_UNIT_SIZE (mode_with_narrower_elts))
std::swap (mode_with_wider_elts, mode_with_narrower_elts);