Gabe Black has submitted this change. (
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
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42033
Reviewed-by: Gabe Black <gabe.bl...@gmail.com>
Maintainer: Gabe Black <gabe.bl...@gmail.com>
Tested-by: kokoro <noreply+kok...@google.com>
---
M src/base/compiler.hh
1 file changed, 10 insertions(+), 0 deletions(-)
Approvals:
Gabe Black: Looks good to me, approved; Looks good to me, approved
kokoro: Regressions pass
diff --git a/src/base/compiler.hh b/src/base/compiler.hh
index 643352c..c003bfa 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 last
+// value. This is compiler specific because it uses variadic macros.
+#define M5_FOR_EACH_IN_PACK(...) \
+do { M5_VAR_USED int i[] = { 0, ((void)(__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: 4
Gerrit-Owner: Gabe Black <gabe.bl...@gmail.com>
Gerrit-Reviewer: Bobby R. Bruce <bbr...@ucdavis.edu>
Gerrit-Reviewer: Daniel Carvalho <oda...@yahoo.com.br>
Gerrit-Reviewer: Gabe Black <gabe.bl...@gmail.com>
Gerrit-Reviewer: Jason Lowe-Power <ja...@lowepower.com>
Gerrit-Reviewer: Jason Lowe-Power <power...@gmail.com>
Gerrit-Reviewer: kokoro <noreply+kok...@google.com>
Gerrit-MessageType: merged
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