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| author | Richard Earnshaw <erich@gnu.org> | 1994-06-06 13:14:03 +0000 |
|---|---|---|
| committer | Richard Earnshaw <erich@gnu.org> | 1994-06-06 13:14:03 +0000 |
| commit | 9c8728721e9f5bb6c95061409a85e9cbb0b3a585 (patch) | |
| tree | 8db5bfe854584e6ca190f444e15fbc2ab4349973 /gcc | |
| parent | 88e70606744ffae9b4e2da6bc610c01548efde48 (diff) | |
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(PROMOTE_MODE): Promote HImode integers as signed.
(BYTES_BIG_ENDIAN): Allow target description to override default.
(LOAD_EXTEND_OP): When big-endian, HImode loads are sign extended.
From-SVN: r7447
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/arm/arm.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h index bf5e8d1..2898ad3 100644 --- a/gcc/config/arm/arm.h +++ b/gcc/config/arm/arm.h @@ -168,6 +168,8 @@ extern enum processor_type arm_cpu; { \ if (MODE == QImode) \ UNSIGNEDP = 1; \ + else if (MODE == HImode) \ + UNSIGNEDP = 0; \ (MODE) = SImode; \ } @@ -197,8 +199,13 @@ extern enum processor_type arm_cpu; in instructions that operate on numbered bit-fields. */ #define BITS_BIG_ENDIAN 0 -/* Define this if most significant byte of a word is the lowest numbered. */ +/* Define this if most significant byte of a word is the lowest numbered. + Most ARM processors are run in little endian mode, but it should now be + possible to build the compiler to support big endian code. (Note: This + is currently a compiler-build-time option, not a run-time one. */ +#ifndef BYTES_BIG_ENDIAN #define BYTES_BIG_ENDIAN 0 +#endif /* Define this if most significant word of a multiword number is the lowest numbered. */ @@ -1129,8 +1136,9 @@ do \ will either zero-extend or sign-extend. The value of this macro should be the code that says which one of the two operations is implicitly done, NIL if none. */ -#define LOAD_EXTEND_OP(MODE) \ - ((MODE) == QImode ? ZERO_EXTEND : NIL) +#define LOAD_EXTEND_OP(MODE) \ + ((MODE) == QImode ? ZERO_EXTEND \ + : ((BYTES_BIG_ENDIAN && (MODE) == HImode) ? SIGN_EXTEND : NIL)) /* Define this if zero-extension is slow (more than one real instruction). On the ARM, it is more than one instruction only if not fetching from |