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ab6e2bc3d0
Today it's just `sub` <https://rust.godbolt.org/z/8EzEPnMr5>; with this PR it's `sub nsw`.
35 lines
1.1 KiB
Rust
35 lines
1.1 KiB
Rust
// compile-flags: -O -Z merge-functions=disabled
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// ignore-debug (the extra assertions get in the way)
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#![crate_type = "lib"]
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// CHECK-LABEL: ptr @i32_add(
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// CHECK-SAME: [[WORD:i[0-9]+]] noundef %n)
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#[no_mangle]
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pub unsafe fn i32_add(p: *const i32, n: usize) -> *const i32 {
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// CHECK: %[[TEMP:.+]] = getelementptr inbounds i32, ptr %p, [[WORD]] %n
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// CHECK: ret ptr %[[TEMP]]
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p.add(n)
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}
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// Ensure we tell LLVM that the negation in `sub` can't overflow.
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// CHECK-LABEL: ptr @i32_sub(
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// CHECK-SAME: [[WORD:i[0-9]+]] noundef %n)
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#[no_mangle]
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pub unsafe fn i32_sub(p: *const i32, n: usize) -> *const i32 {
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// CHECK: %[[DELTA:.+]] = sub nsw [[WORD]] 0, %n
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// CHECK: %[[TEMP:.+]] = getelementptr inbounds i32, ptr %p, [[WORD]] %[[DELTA]]
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// CHECK: ret ptr %[[TEMP]]
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p.sub(n)
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}
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// CHECK-LABEL: ptr @i32_offset(
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// CHECK-SAME: [[WORD:i[0-9]+]] noundef %d)
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#[no_mangle]
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pub unsafe fn i32_offset(p: *const i32, d: isize) -> *const i32 {
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// CHECK: %[[TEMP:.+]] = getelementptr inbounds i32, ptr %p, [[WORD]] %d
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// CHECK: ret ptr %[[TEMP]]
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p.offset(d)
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}
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