Gabe Black has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/42033 )
Change subject: base: Add a macro to expand parameter pack expressions in
order.
......................................................................
base: Add a macro to expand parameter pack expressions in order.
This wraps up the strange compiler goop necessary to evaluate
expressions based on parameter pack expansions in order.
Change-Id: I16fbd53d22492a8c20524e3ef8bb8ff5e5d59b14
---
M src/base/compiler.hh
1 file changed, 10 insertions(+), 0 deletions(-)
diff --git a/src/base/compiler.hh b/src/base/compiler.hh
index 643352c..9830e74 100644
--- a/src/base/compiler.hh
+++ b/src/base/compiler.hh
@@ -112,6 +112,16 @@
// we can't do that with direct substitution.
# define M5_LIKELY(cond) __builtin_expect(!!(cond), 1)
# define M5_UNLIKELY(cond) __builtin_expect(!!(cond), 0)
+
+// Evaluate an expanded parameter pack in order. Multiple arguments can be
+// passed in which be evaluated in order relative to each other as a group.
+// The argument(s) must include a parameter pack to expand. This works
because
+// the elements of a brace inclosed initializer list are evaluated in
order,
+// as are the arguments to the comma operator, which evaluates to the later
+// value. This is compiler specific because it uses variadic templates.
+#define M5_EXPAND_IN_ORDER(...) \
+do { M5_VAR_USED int dummy[] = { 0, (__VA_ARGS__, 0)... }; } while (false)
+
#else
# error "Don't know what to do for your compiler."
#endif
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I16fbd53d22492a8c20524e3ef8bb8ff5e5d59b14
Gerrit-Change-Number: 42033
Gerrit-PatchSet: 1
Gerrit-Owner: Gabe Black <[email protected]>
Gerrit-MessageType: newchange
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