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cranelift: Rework block instructions to use BlockCall (#5464)

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Add a new type BlockCall that represents the pair of a block name with arguments to be passed to it. (The mnemonic here is that it looks a bit like a function call.) Rework the implementation of jump, brz, and brnz to use BlockCall instead of storing the block arguments as varargs in the instruction's ValueList.

To ensure that we're processing block arguments from BlockCall values in instructions, three new functions have been introduced on DataFlowGraph that both sets of arguments:

inst_values - returns an iterator that traverses values in the instruction and block arguments
map_inst_values - applies a function to each value in the instruction and block arguments
overwrite_inst_values - overwrite all values in an instruction and block arguments with values from the iterator

Co-authored-by: Jamey Sharp <jamey@minilop.net>
This commit is contained in:
Trevor Elliott
2023-01-17 16:31:15 -08:00
committed by GitHub
parent 3a2ca67570
commit 1e6c13d83e
32 changed files with 475 additions and 422 deletions
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6
cranelift/codegen/src/isa/s390x/lower.isle
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@@ -3714,7 +3714,7 @@
;; Unconditional branch. The target is found as first (and only) element in
;; the list of the current block's branch targets passed as `targets`.
(rule (lower_branch (jump _ _) targets)
(rule (lower_branch (jump _) targets)
(emit_side_effect (jump_impl (vec_element targets 0))))
@@ -3755,7 +3755,7 @@
;; Two-way conditional branch on zero. `targets` contains:
;; - element 0: target if the condition is true (i.e. value is zero)
;; - element 1: target if the condition is false (i.e. value is nonzero)
(rule (lower_branch (brz val_cond _ _) targets)
(rule (lower_branch (brz val_cond _) targets)
(emit_side_effect (cond_br_bool (invert_bool (value_nonzero val_cond))
(vec_element targets 0)
(vec_element targets 1))))
@@ -3766,7 +3766,7 @@
;; Two-way conditional branch on nonzero. `targets` contains:
;; - element 0: target if the condition is true (i.e. value is nonzero)
;; - element 1: target if the condition is false (i.e. value is zero)
(rule (lower_branch (brnz val_cond _ _) targets)
(rule (lower_branch (brnz val_cond _) targets)
(emit_side_effect (cond_br_bool (value_nonzero val_cond)
(vec_element targets 0)
(vec_element targets 1))))