I had thought extract_bit_field bitpos argument was the shifted position
and not the bitposition like BIT_FIELD_REF so I had removed the code which
would use the correct bitposition for BYTES_BIG_ENDIAN.
Committed as obvious; I checked big-endian MIPS to make sure we are now
producing the correct code.
gcc/ChangeLog:
* expr.cc (expand_single_bit_test): Correct bitpos for big-endian.
---
gcc/expr.cc | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/gcc/expr.cc b/gcc/expr.cc
index 02f24c00148..050efcd0b00 100644
--- a/gcc/expr.cc
+++ b/gcc/expr.cc
@@ -12958,7 +12958,14 @@ expand_single_bit_test (location_t loc, enum tree_code
code,
rtx inner0 = expand_expr (inner, NULL_RTX, VOIDmode, EXPAND_NORMAL);
- inner0 = extract_bit_field (inner0, 1, bitnum, 1, target,
+ int bitpos = bitnum;
+
+ scalar_int_mode imode = as_a <scalar_int_mode>(GET_MODE (inner0));
+
+ if (BYTES_BIG_ENDIAN)
+ bitpos = GET_MODE_BITSIZE (imode) - 1 - bitpos;
+
+ inner0 = extract_bit_field (inner0, 1, bitpos, 1, target,
operand_mode, mode, 0, NULL);
if (code == EQ_EXPR)
--
2.31.1
