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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.
62 lines
3.0 KiB
C
62 lines
3.0 KiB
C
// RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -o - %s \
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// RUN: | FileCheck %s --check-prefix=GNU32
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// RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -o - %s -mms-bitfields \
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// RUN: | FileCheck %s --check-prefix=GNU32
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// RUN: %clang_cc1 -triple x86_64-windows-gnu -emit-llvm -o - %s \
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// RUN: | FileCheck %s --check-prefix=GNU64
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// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -o - %s \
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// RUN: | FileCheck %s --check-prefix=MSC64
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struct {
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char c;
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long double ldb;
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} agggregate_LD = {};
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// GNU32: %struct.anon = type { i8, x86_fp80 }
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// GNU32: @agggregate_LD = dso_local global %struct.anon zeroinitializer, align 4
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// GNU64: %struct.anon = type { i8, x86_fp80 }
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// GNU64: @agggregate_LD = dso_local global %struct.anon zeroinitializer, align 16
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// MSC64: %struct.anon = type { i8, double }
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// MSC64: @agggregate_LD = dso_local global %struct.anon zeroinitializer, align 8
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long double dataLD = 1.0L;
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// GNU32: @dataLD = dso_local global x86_fp80 0xK3FFF8000000000000000, align 4
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// GNU64: @dataLD = dso_local global x86_fp80 0xK3FFF8000000000000000, align 16
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// MSC64: @dataLD = dso_local global double 1.000000e+00, align 8
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long double _Complex dataLDC = {1.0L, 1.0L};
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// GNU32: @dataLDC = dso_local global { x86_fp80, x86_fp80 } { x86_fp80 0xK3FFF8000000000000000, x86_fp80 0xK3FFF8000000000000000 }, align 4
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// GNU64: @dataLDC = dso_local global { x86_fp80, x86_fp80 } { x86_fp80 0xK3FFF8000000000000000, x86_fp80 0xK3FFF8000000000000000 }, align 16
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// MSC64: @dataLDC = dso_local global { double, double } { double 1.000000e+00, double 1.000000e+00 }, align 8
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long double TestLD(long double x) {
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return x * x;
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}
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// GNU32: define dso_local x86_fp80 @TestLD(x86_fp80 noundef %x)
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// GNU64: define dso_local void @TestLD(ptr dead_on_unwind noalias writable sret(x86_fp80) align 16 %agg.result, ptr noundef %0)
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// MSC64: define dso_local double @TestLD(double noundef %x)
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long double _Complex TestLDC(long double _Complex x) {
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return x * x;
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}
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// GNU32: define dso_local void @TestLDC(ptr dead_on_unwind noalias writable sret({ x86_fp80, x86_fp80 }) align 4 %agg.result, ptr noundef byval({ x86_fp80, x86_fp80 }) align 4 %x)
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// GNU64: define dso_local void @TestLDC(ptr dead_on_unwind noalias writable sret({ x86_fp80, x86_fp80 }) align 16 %agg.result, ptr noundef %x)
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// MSC64: define dso_local void @TestLDC(ptr dead_on_unwind noalias writable sret({ double, double }) align 8 %agg.result, ptr noundef %x)
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// GNU32: declare dso_local void @__mulxc3
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// GNU64: declare dso_local void @__mulxc3
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// MSC64: declare dso_local void @__muldc3
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void VarArgLD(int a, ...) {
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// GNU32-LABEL: define{{.*}} void @VarArgLD
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// GNU64-LABEL: define{{.*}} void @VarArgLD
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// MSC64-LABEL: define{{.*}} void @VarArgLD
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__builtin_va_list ap;
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__builtin_va_start(ap, a);
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long double LD = __builtin_va_arg(ap, long double);
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// GNU32: load x86_fp80, ptr %argp.cur
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// GNU64: [[P:%.*]] = load ptr, ptr %argp.cur
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// GNU64: load x86_fp80, ptr [[P]]
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// MSC64: load double, ptr %argp.cur
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__builtin_va_end(ap);
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}
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