158d72d728
Set the writable and dead_on_unwind attributes for sret arguments. These indicate that the argument points to writable memory (and it's legal to introduce spurious writes to it on entry to the function) and that the argument memory will not be used if the call unwinds. This enables additional MemCpyOpt/DSE/LICM optimizations.
31 lines
978 B
C
31 lines
978 B
C
// RUN: %clang_cc1 -triple arm64_32-apple-ios7.0 -emit-llvm -o - %s | FileCheck %s
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struct Foo {
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char a;
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int b : 1;
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};
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int BitfieldOffset = sizeof(struct Foo);
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// CHECK: @BitfieldOffset ={{.*}} global i32 2
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int PointerSize = sizeof(void *);
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// CHECK: @PointerSize ={{.*}} global i32 4
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int PointerAlign = __alignof(void *);
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// CHECK: @PointerAlign ={{.*}} global i32 4
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int LongSize = sizeof(long);
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// CHECK: @LongSize ={{.*}} global i32 4
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int LongAlign = __alignof(long);
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// CHECK: @LongAlign ={{.*}} global i32 4
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// Not expected to change, but it's a difference between AAPCS and DarwinPCS
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// that we need to be preserved for compatibility with ARMv7k.
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long double LongDoubleVar = 0.0;
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// CHECK: @LongDoubleVar ={{.*}} global double
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typedef float __attribute__((ext_vector_type(16))) v16f32;
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v16f32 func(v16f32 in) { return in; }
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// CHECK: define{{.*}} void @func(ptr dead_on_unwind noalias writable sret(<16 x float>) align 16 {{%.*}}, <16 x float> noundef {{%.*}})
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