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interp: simplify pointer arithmetic in getLLVMValue

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Instead of doing lots of complicated calculations to get the shortest
GEP, I'll just cast it to i8*, do the GEP, and optionally cast to the
requested type.

This currently produces ugly constant expressions, but once LLVM
switches to opaque pointer types all of this shouldn't matter anymore.
This commit is contained in:
Ayke van Laethem
2021-10-30 20:04:20 +02:00
committed by Ron Evans
parent 27cbb53538
commit 54dd75f7b3
2 changed files with 26 additions and 77 deletions
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interp/testdata/basic.out.ll
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+1 -1
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@@ -21,7 +21,7 @@ entry:
store i64 %value1, i64* getelementptr inbounds ([4 x i64], [4 x i64]* @main.nonConst1, i32 0, i32 0), align 8
%value2 = load i64, i64* getelementptr inbounds ([4 x i64], [4 x i64]* @main.nonConst1, i32 0, i32 0), align 8
store i64 %value2, i64* @main.nonConst2, align 8
call void @modifyExternal(i32* getelementptr inbounds ([8 x { i16, i32 }], [8 x { i16, i32 }]* @main.someArray, i32 0, i32 3, i32 1))
call void @modifyExternal(i32* bitcast (i8* getelementptr inbounds (i8, i8* bitcast ([8 x { i16, i32 }]* @main.someArray to i8*), i32 28) to i32*))
call void @modifyExternal(i32* bitcast ([1 x i16*]* @main.exportedValue to i32*))
store i16 5, i16* @main.exposedValue1, align 2
call void @modifyExternal(i32* bitcast (void ()* @willModifyGlobal to i32*))