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compiler: add 'align' attribute to runtime.alloc calls

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This adds something like 'align 4' to the runtime.alloc calls, so that
the compiler knows the alignment of the allocation and can optimize
accordingly.

The optimization is very small, only 0.01% in my small test. However, my
plan is to read the value in the heap-to-stack transform pass to make it
more correct and let it produce slightly more optimal code.
This commit is contained in:
Ayke van Laethem
2024-06-27 20:25:33 +02:00
committed by Ron Evans
parent 9cb263479c
commit 571447c7c1
6 changed files with 36 additions and 30 deletions
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compiler/testdata/slice.ll
Vendored
+6 -6
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@@ -48,7 +48,7 @@ declare void @runtime.lookupPanic(ptr) #1
define hidden { ptr, i32, i32 } @main.sliceAppendValues(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #2 {
entry:
%stackalloc = alloca i8, align 1
%varargs = call dereferenceable(12) ptr @runtime.alloc(i32 12, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%varargs = call align 4 dereferenceable(12) ptr @runtime.alloc(i32 12, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %varargs, ptr nonnull %stackalloc, ptr undef) #3
store i32 1, ptr %varargs, align 4
%0 = getelementptr inbounds [3 x i32], ptr %varargs, i32 0, i32 1
@@ -100,7 +100,7 @@ entry:
br i1 %slice.maxcap, label %slice.throw, label %slice.next
slice.next: ; preds = %entry
%makeslice.buf = call ptr @runtime.alloc(i32 %len, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%makeslice.buf = call align 1 ptr @runtime.alloc(i32 %len, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
@@ -123,7 +123,7 @@ entry:
slice.next: ; preds = %entry
%makeslice.cap = shl nuw i32 %len, 1
%makeslice.buf = call ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%makeslice.buf = call align 2 ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
@@ -144,7 +144,7 @@ entry:
slice.next: ; preds = %entry
%makeslice.cap = mul i32 %len, 3
%makeslice.buf = call ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%makeslice.buf = call align 1 ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
@@ -165,7 +165,7 @@ entry:
slice.next: ; preds = %entry
%makeslice.cap = shl nuw i32 %len, 2
%makeslice.buf = call ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%makeslice.buf = call align 4 ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
@@ -216,7 +216,7 @@ declare void @runtime.sliceToArrayPointerPanic(ptr) #1
define hidden ptr @main.SliceToArrayConst(ptr %context) unnamed_addr #2 {
entry:
%stackalloc = alloca i8, align 1
%makeslice = call dereferenceable(24) ptr @runtime.alloc(i32 24, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
%makeslice = call align 4 dereferenceable(24) ptr @runtime.alloc(i32 24, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %makeslice, ptr nonnull %stackalloc, ptr undef) #3
br i1 false, label %slicetoarray.throw, label %slicetoarray.next