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compiler: mark string parameters as readonly

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Strings are readonly, but the compiler doesn't always know this. Marking
them as readonly in the frontend allows the compiler to optimize based
on this knowledge.

This provides some small code size benefits. I didn't measure running
speed.
This commit is contained in:
Ayke van Laethem
2025-10-10 14:17:34 +02:00
committed by Ron Evans
parent 3be7100e89
commit 7460734522
5 changed files with 25 additions and 12 deletions
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compiler/testdata/go1.21.ll
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+3 -3
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@@ -77,7 +77,7 @@ entry:
}
; Function Attrs: nounwind
define hidden %runtime._string @main.minString(ptr %a.data, i32 %a.len, ptr %b.data, i32 %b.len, ptr %context) unnamed_addr #2 {
define hidden %runtime._string @main.minString(ptr readonly %a.data, i32 %a.len, ptr readonly %b.data, i32 %b.len, ptr %context) unnamed_addr #2 {
entry:
%0 = insertvalue %runtime._string zeroinitializer, ptr %a.data, 0
%1 = insertvalue %runtime._string %0, i32 %a.len, 1
@@ -91,7 +91,7 @@ entry:
ret %runtime._string %5
}
declare i1 @runtime.stringLess(ptr, i32, ptr, i32, ptr) #1
declare i1 @runtime.stringLess(ptr readonly, i32, ptr readonly, i32, ptr) #1
; Function Attrs: nounwind
define hidden i32 @main.maxInt(i32 %a, i32 %b, ptr %context) unnamed_addr #2 {
@@ -116,7 +116,7 @@ entry:
}
; Function Attrs: nounwind
define hidden %runtime._string @main.maxString(ptr %a.data, i32 %a.len, ptr %b.data, i32 %b.len, ptr %context) unnamed_addr #2 {
define hidden %runtime._string @main.maxString(ptr readonly %a.data, i32 %a.len, ptr readonly %b.data, i32 %b.len, ptr %context) unnamed_addr #2 {
entry:
%0 = insertvalue %runtime._string zeroinitializer, ptr %a.data, 0
%1 = insertvalue %runtime._string %0, i32 %a.len, 1