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.
40 lines
1.7 KiB
C
40 lines
1.7 KiB
C
// REQUIRES: powerpc-registered-target
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// RUN: %clang_cc1 -triple powerpc-unknown-aix -emit-llvm -o - %s | \
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// RUN: FileCheck %s --check-prefixes=AIX,AIX32
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// RUN: %clang_cc1 -triple powerpc64-unknown-aix -emit-llvm -o - %s | \
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// RUN: FileCheck %s --check-prefixes=AIX,AIX64
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// AIX: @d = global double 0.000000e+00, align 8
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double d;
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typedef struct {
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double d;
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int i;
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} StructDouble;
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// AIX: @d1 = global %struct.StructDouble zeroinitializer, align 8
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StructDouble d1;
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// AIX: double @retDouble(double noundef %x)
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// AIX: %x.addr = alloca double, align 8
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// AIX: store double %x, ptr %x.addr, align 8
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// AIX: load double, ptr %x.addr, align 8
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// AIX: ret double %0
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double retDouble(double x) { return x; }
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// AIX32: define void @bar(ptr dead_on_unwind noalias writable sret(%struct.StructDouble) align 4 %agg.result, ptr noundef byval(%struct.StructDouble) align 4 %x)
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// AIX64: define void @bar(ptr dead_on_unwind noalias writable sret(%struct.StructDouble) align 4 %agg.result, ptr noundef byval(%struct.StructDouble) align 8 %x)
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// AIX32: call void @llvm.memcpy.p0.p0.i32(ptr align 4 %agg.result, ptr align 4 %x, i32 16, i1 false)
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// AIX64: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %agg.result, ptr align 8 %x, i64 16, i1 false)
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StructDouble bar(StructDouble x) { return x; }
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// AIX: define void @foo(ptr noundef %out, ptr noundef %in)
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// AIX32: %0 = load ptr, ptr %in.addr, align 4
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// AIX64: %0 = load ptr, ptr %in.addr, align 8
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// AIX: %1 = load double, ptr %0, align 4
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// AIX: %mul = fmul double %1, 2.000000e+00
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// AIX32: %2 = load ptr, ptr %out.addr, align 4
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// AIX64: %2 = load ptr, ptr %out.addr, align 8
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// AIX: store double %mul, ptr %2, align 4
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void foo(double *out, double *in) { *out = *in * 2; }
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