066ba54346
A `%[name]` that references a symbol ("s") operand without an explicit
modifier now lowers to `${N:c}` (LLVM 'bare constant — no punctuation')
instead of `${N}`. This makes `bl %[fn]` / `call %[fn]` portable across
targets with no per-arch knowledge: x86 would otherwise render `$cb`
(an invalid call target, requiring a hand-written `:P`); aarch64 is
unaffected. Verified `:c` is equivalent to `:P` for x86-64 calls (both
emit R_X86_64_PLT32), and correct for branch targets, RIP-relative
addressing, and `$`-prefixed absolute immediates.
renderAsmTemplate injects `:c` only for symbol operands lacking an
explicit modifier (asmNamedIsSymbol helper); an explicit `%[name:X]`
still wins (escape hatch). x86 example 1659 drops its `:P` for the same
plain `%[fn]` as aarch64 1656. Snapshots regen to `${N:c}`. zig build
test green (668 corpus, 446 unit).
29 lines
789 B
Plaintext
29 lines
789 B
Plaintext
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; Function Attrs: nounwind
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define i64 @cb(i64 %0) #0 {
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entry:
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%alloca = alloca i64, align 8
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store i64 %0, ptr %alloca, align 8
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%load = load i64, ptr %alloca, align 8
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%add = add i64 %load, 1
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ret i64 %add
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}
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; Function Attrs: nounwind
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define internal i64 @tramp(i64 %0) #0 {
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entry:
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%alloca = alloca i64, align 8
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store i64 %0, ptr %alloca, align 8
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%load = load i64, ptr %alloca, align 8
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%asm = call i64 asm sideeffect " stp x29, x30, [sp, #-16]!\0A mov x0, ${1}\0A bl ${2:c}\0A mov ${0}, x0\0A ldp x29, x30, [sp], #16\0A", "=r,r,s,~{x0},~{x30},~{memory}"(i64 %load, ptr @cb)
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ret i64 %asm
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}
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; Function Attrs: nounwind
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define i32 @main() #0 {
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entry:
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%call = call i64 @tramp(i64 41)
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%ca.tr = trunc i64 %call to i32
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ret i32 %ca.tr
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}
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