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compiler: insert basic blocks at an appropriate location

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For example, this commit moves the 'throw' branch of an assertion (nil
check, slice index check, etc) to the end of the function while
inserting the "continue" branch right after the insert location. This
makes the resulting IR easier to follow.

For some reason, this also reduces code size a bit on average. The
TinyGo smoke tests saw a reduction of 0.22%, mainly from WebAssembly.
The drivers repo saw little average change in code size (-0.01%).

This commit also adds a few compiler tests for the defer keyword.
This commit is contained in:
Ayke van Laethem
2021-11-29 14:51:49 +01:00
committed by Ron Evans
parent 2fb5174910
commit 79ba6a50c3
13 changed files with 272 additions and 89 deletions
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compiler/testdata/basic.ll
Vendored
+16 -16
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@@ -36,10 +36,6 @@ entry:
%0 = icmp eq i32 %y, 0
br i1 %0, label %divbyzero.throw, label %divbyzero.next
divbyzero.throw: ; preds = %entry
call void @runtime.divideByZeroPanic(i8* undef) #0
unreachable
divbyzero.next: ; preds = %entry
%1 = icmp eq i32 %y, -1
%2 = icmp eq i32 %x, -2147483648
@@ -47,6 +43,10 @@ divbyzero.next: ; preds = %entry
%4 = select i1 %3, i32 1, i32 %y
%5 = sdiv i32 %x, %4
ret i32 %5
divbyzero.throw: ; preds = %entry
call void @runtime.divideByZeroPanic(i8* undef) #0
unreachable
}
declare void @runtime.divideByZeroPanic(i8*)
@@ -57,13 +57,13 @@ entry:
%0 = icmp eq i32 %y, 0
br i1 %0, label %divbyzero.throw, label %divbyzero.next
divbyzero.throw: ; preds = %entry
call void @runtime.divideByZeroPanic(i8* undef) #0
unreachable
divbyzero.next: ; preds = %entry
%1 = udiv i32 %x, %y
ret i32 %1
divbyzero.throw: ; preds = %entry
call void @runtime.divideByZeroPanic(i8* undef) #0
unreachable
}
; Function Attrs: nounwind
@@ -72,10 +72,6 @@ entry:
%0 = icmp eq i32 %y, 0
br i1 %0, label %divbyzero.throw, label %divbyzero.next
divbyzero.throw: ; preds = %entry
call void @runtime.divideByZeroPanic(i8* undef) #0
unreachable
divbyzero.next: ; preds = %entry
%1 = icmp eq i32 %y, -1
%2 = icmp eq i32 %x, -2147483648
@@ -83,6 +79,10 @@ divbyzero.next: ; preds = %entry
%4 = select i1 %3, i32 1, i32 %y
%5 = srem i32 %x, %4
ret i32 %5
divbyzero.throw: ; preds = %entry
call void @runtime.divideByZeroPanic(i8* undef) #0
unreachable
}
; Function Attrs: nounwind
@@ -91,13 +91,13 @@ entry:
%0 = icmp eq i32 %y, 0
br i1 %0, label %divbyzero.throw, label %divbyzero.next
divbyzero.throw: ; preds = %entry
call void @runtime.divideByZeroPanic(i8* undef) #0
unreachable
divbyzero.next: ; preds = %entry
%1 = urem i32 %x, %y
ret i32 %1
divbyzero.throw: ; preds = %entry
call void @runtime.divideByZeroPanic(i8* undef) #0
unreachable
}
; Function Attrs: nounwind