diff options
| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2018-07-06 00:12:40 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2018-07-23 13:11:20 +0200 |
| commit | 99b428918d696386fd72ea21a132a2baeb350169 (patch) | |
| tree | 342830b71a1bf146fa851c9adee0c06812762cdc | |
| parent | 5da4e09b47011d11c3ed8e1915a316ec8cf8897f (diff) | |
| download | sparse-dev-99b428918d696386fd72ea21a132a2baeb350169.tar.gz | |
cast: simplify SEXT(SEXT(x,N),N')
A sign-extension following another sign-extension can always
be simplified into a single sign-extension.
Simplify away such instructions.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 5 | ||||
| -rw-r--r-- | validation/optim/sext-sext.c | 1 |
2 files changed, 5 insertions, 1 deletions
@@ -1090,6 +1090,11 @@ static int simplify_cast(struct instruction *insn) insn->orig_type = def->orig_type; return replace_pseudo(insn, &insn->src, def->src); } + switch (insn->opcode) { + case OP_SEXT: + insn->orig_type = def->orig_type; + return replace_pseudo(insn, &insn->src, def->src); + } break; } diff --git a/validation/optim/sext-sext.c b/validation/optim/sext-sext.c index 3f7a0efc..604a7dd4 100644 --- a/validation/optim/sext-sext.c +++ b/validation/optim/sext-sext.c @@ -6,7 +6,6 @@ int foo(signed char offset) /* * check-name: sext-sext * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-pattern(1): sext\\. |