combine.c (expand_field_assignment): Do not discard SUBREGs while computing nonzero_bits.

* combine.c (expand_field_assignment): Do not discard SUBREGs while computing nonzero_bits. From-SVN: r31304

combine.c (expand_field_assignment): Do not discard SUBREGs while computing nonzero_bits.
* combine.c (expand_field_assignment): Do not discard SUBREGs while computing nonzero_bits. From-SVN: r31304
b1e9c8a9 · Alexandre Oliva · Alexandre Oliva · 93e1dce9 · b1e9c8a9 · b1e9c8a9
Commit b1e9c8a9 authored Jan 10, 2000 by Alexandre Oliva Committed by Alexandre Oliva Jan 10, 2000
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gcc/combine.c
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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+2000-01-10  Alexandre Oliva  <oliva@lsd.ic.unicamp.br>
+
+	* combine.c (expand_field_assignment): Do not discard SUBREGs
+	while computing nonzero_bits.
+
 2000-01-09  Nick Clifton  <nickc@cygnus.com>

 	* config/arm/arm.c: Fix compile time warnings about signed vs

--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -5656,6 +5656,8 @@ expand_field_assignment (x)
      /* A SUBREG between two modes that occupy the same numbers of words
 	 can be done by moving the SUBREG to the source.  */
      else if (GET_CODE (SET_DEST (x)) == SUBREG
+	       /* We need SUBREGs to compute nonzero_bits properly.  */
+	       && nonzero_sign_valid
 	       && (((GET_MODE_SIZE (GET_MODE (SET_DEST (x)))
 		     + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)
 		   == ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (SET_DEST (x))))