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[ConstantTime][WebAssembly] Add comprehensive tests for ct.select #166709

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376 changes: 376 additions & 0 deletions llvm/test/CodeGen/WebAssembly/ctselect-fallback-edge-cases.ll
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=wasm32-unknown-unknown -O3 -filetype=asm | FileCheck %s --check-prefix=W32
; RUN: llc < %s -mtriple=wasm64-unknown-unknown -O3 -filetype=asm | FileCheck %s --check-prefix=W64

; Test with small integer types
define i1 @test_ctselect_i1(i1 %cond, i1 %a, i1 %b) {
; W32-LABEL: test_ctselect_i1:
; W32: .functype test_ctselect_i1 (i32, i32, i32) -> (i32)
; W32-NEXT: # %bb.0:
; W32-NEXT: local.get 0
; W32-NEXT: local.get 1
; W32-NEXT: i32.and
; W32-NEXT: local.get 0
; W32-NEXT: i32.const 1
; W32-NEXT: i32.xor
; W32-NEXT: local.get 2
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: # fallthrough-return
;
; W64-LABEL: test_ctselect_i1:
; W64: .functype test_ctselect_i1 (i32, i32, i32) -> (i32)
; W64-NEXT: # %bb.0:
; W64-NEXT: local.get 0
; W64-NEXT: local.get 1
; W64-NEXT: i32.and
; W64-NEXT: local.get 0
; W64-NEXT: i32.const 1
; W64-NEXT: i32.xor
; W64-NEXT: local.get 2
; W64-NEXT: i32.and
; W64-NEXT: i32.or
; W64-NEXT: # fallthrough-return
%result = call i1 @llvm.ct.select.i1(i1 %cond, i1 %a, i1 %b)
ret i1 %result
}

; Test with extremal values
define i32 @test_ctselect_extremal_values(i1 %cond) {
; W32-LABEL: test_ctselect_extremal_values:
; W32: .functype test_ctselect_extremal_values (i32) -> (i32)
; W32-NEXT: # %bb.0:
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 0
; W32-NEXT: i32.const 1
; W32-NEXT: i32.and
; W32-NEXT: local.tee 0
; W32-NEXT: i32.sub
; W32-NEXT: i32.const 2147483647
; W32-NEXT: i32.and
; W32-NEXT: local.get 0
; W32-NEXT: i32.const -1
; W32-NEXT: i32.add
; W32-NEXT: i32.const -2147483648
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: # fallthrough-return
;
; W64-LABEL: test_ctselect_extremal_values:
; W64: .functype test_ctselect_extremal_values (i32) -> (i32)
; W64-NEXT: # %bb.0:
; W64-NEXT: i32.const 0
; W64-NEXT: local.get 0
; W64-NEXT: i32.const 1
; W64-NEXT: i32.and
; W64-NEXT: local.tee 0
; W64-NEXT: i32.sub
; W64-NEXT: i32.const 2147483647
; W64-NEXT: i32.and
; W64-NEXT: local.get 0
; W64-NEXT: i32.const -1
; W64-NEXT: i32.add
; W64-NEXT: i32.const -2147483648
; W64-NEXT: i32.and
; W64-NEXT: i32.or
; W64-NEXT: # fallthrough-return
%result = call i32 @llvm.ct.select.i32(i1 %cond, i32 2147483647, i32 -2147483648)
ret i32 %result
}

; Test with null pointers
define ptr @test_ctselect_null_ptr(i1 %cond, ptr %ptr) {
; W32-LABEL: test_ctselect_null_ptr:
; W32: .functype test_ctselect_null_ptr (i32, i32) -> (i32)
; W32-NEXT: # %bb.0:
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 0
; W32-NEXT: i32.const 1
; W32-NEXT: i32.and
; W32-NEXT: i32.sub
; W32-NEXT: local.get 1
; W32-NEXT: i32.and
; W32-NEXT: # fallthrough-return
;
; W64-LABEL: test_ctselect_null_ptr:
; W64: .functype test_ctselect_null_ptr (i32, i64) -> (i64)
; W64-NEXT: # %bb.0:
; W64-NEXT: i64.const 0
; W64-NEXT: local.get 0
; W64-NEXT: i64.extend_i32_u
; W64-NEXT: i64.const 1
; W64-NEXT: i64.and
; W64-NEXT: i64.sub
; W64-NEXT: local.get 1
; W64-NEXT: i64.and
; W64-NEXT: # fallthrough-return
%result = call ptr @llvm.ct.select.p0(i1 %cond, ptr %ptr, ptr null)
ret ptr %result
}

; Test with function pointers
define ptr @test_ctselect_function_ptr(i1 %cond, ptr %func1, ptr %func2) {
; W32-LABEL: test_ctselect_function_ptr:
; W32: .functype test_ctselect_function_ptr (i32, i32, i32) -> (i32)
; W32-NEXT: # %bb.0:
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 0
; W32-NEXT: i32.const 1
; W32-NEXT: i32.and
; W32-NEXT: local.tee 0
; W32-NEXT: i32.sub
; W32-NEXT: local.get 1
; W32-NEXT: i32.and
; W32-NEXT: local.get 0
; W32-NEXT: i32.const -1
; W32-NEXT: i32.add
; W32-NEXT: local.get 2
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: # fallthrough-return
;
; W64-LABEL: test_ctselect_function_ptr:
; W64: .functype test_ctselect_function_ptr (i32, i64, i64) -> (i64)
; W64-NEXT: .local i64
; W64-NEXT: # %bb.0:
; W64-NEXT: i64.const 0
; W64-NEXT: local.get 0
; W64-NEXT: i64.extend_i32_u
; W64-NEXT: i64.const 1
; W64-NEXT: i64.and
; W64-NEXT: local.tee 3
; W64-NEXT: i64.sub
; W64-NEXT: local.get 1
; W64-NEXT: i64.and
; W64-NEXT: local.get 3
; W64-NEXT: i64.const -1
; W64-NEXT: i64.add
; W64-NEXT: local.get 2
; W64-NEXT: i64.and
; W64-NEXT: i64.or
; W64-NEXT: # fallthrough-return
%result = call ptr @llvm.ct.select.p0(i1 %cond, ptr %func1, ptr %func2)
ret ptr %result
}

; Test with condition from icmp on pointers
define ptr @test_ctselect_ptr_cmp(ptr %p1, ptr %p2, ptr %a, ptr %b) {
; W32-LABEL: test_ctselect_ptr_cmp:
; W32: .functype test_ctselect_ptr_cmp (i32, i32, i32, i32) -> (i32)
; W32-NEXT: # %bb.0:
; W32-NEXT: i32.const -1
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 0
; W32-NEXT: local.get 1
; W32-NEXT: i32.eq
; W32-NEXT: i32.select
; W32-NEXT: local.tee 1
; W32-NEXT: local.get 2
; W32-NEXT: i32.and
; W32-NEXT: local.get 1
; W32-NEXT: i32.const -1
; W32-NEXT: i32.xor
; W32-NEXT: local.get 3
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: # fallthrough-return
;
; W64-LABEL: test_ctselect_ptr_cmp:
; W64: .functype test_ctselect_ptr_cmp (i64, i64, i64, i64) -> (i64)
; W64-NEXT: # %bb.0:
; W64-NEXT: i64.const -1
; W64-NEXT: i64.const 0
; W64-NEXT: local.get 0
; W64-NEXT: local.get 1
; W64-NEXT: i64.eq
; W64-NEXT: i64.select
; W64-NEXT: local.tee 1
; W64-NEXT: local.get 2
; W64-NEXT: i64.and
; W64-NEXT: local.get 1
; W64-NEXT: i64.const -1
; W64-NEXT: i64.xor
; W64-NEXT: local.get 3
; W64-NEXT: i64.and
; W64-NEXT: i64.or
; W64-NEXT: # fallthrough-return
%cmp = icmp eq ptr %p1, %p2
%result = call ptr @llvm.ct.select.p0(i1 %cmp, ptr %a, ptr %b)
ret ptr %result
}

; Test with struct pointer types
%struct.pair = type { i32, i32 }

define ptr @test_ctselect_struct_ptr(i1 %cond, ptr %a, ptr %b) {
; W32-LABEL: test_ctselect_struct_ptr:
; W32: .functype test_ctselect_struct_ptr (i32, i32, i32) -> (i32)
; W32-NEXT: # %bb.0:
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 0
; W32-NEXT: i32.const 1
; W32-NEXT: i32.and
; W32-NEXT: local.tee 0
; W32-NEXT: i32.sub
; W32-NEXT: local.get 1
; W32-NEXT: i32.and
; W32-NEXT: local.get 0
; W32-NEXT: i32.const -1
; W32-NEXT: i32.add
; W32-NEXT: local.get 2
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: # fallthrough-return
;
; W64-LABEL: test_ctselect_struct_ptr:
; W64: .functype test_ctselect_struct_ptr (i32, i64, i64) -> (i64)
; W64-NEXT: .local i64
; W64-NEXT: # %bb.0:
; W64-NEXT: i64.const 0
; W64-NEXT: local.get 0
; W64-NEXT: i64.extend_i32_u
; W64-NEXT: i64.const 1
; W64-NEXT: i64.and
; W64-NEXT: local.tee 3
; W64-NEXT: i64.sub
; W64-NEXT: local.get 1
; W64-NEXT: i64.and
; W64-NEXT: local.get 3
; W64-NEXT: i64.const -1
; W64-NEXT: i64.add
; W64-NEXT: local.get 2
; W64-NEXT: i64.and
; W64-NEXT: i64.or
; W64-NEXT: # fallthrough-return
%result = call ptr @llvm.ct.select.p0(i1 %cond, ptr %a, ptr %b)
ret ptr %result
}

; Test with deeply nested conditions
define i32 @test_ctselect_deeply_nested(i1 %c1, i1 %c2, i1 %c3, i1 %c4, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
; W32-LABEL: test_ctselect_deeply_nested:
; W32: .functype test_ctselect_deeply_nested (i32, i32, i32, i32, i32, i32, i32, i32, i32) -> (i32)
; W32-NEXT: # %bb.0:
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 3
; W32-NEXT: i32.const 1
; W32-NEXT: i32.and
; W32-NEXT: local.tee 3
; W32-NEXT: i32.sub
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 2
; W32-NEXT: i32.const 1
; W32-NEXT: i32.and
; W32-NEXT: local.tee 2
; W32-NEXT: i32.sub
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 1
; W32-NEXT: i32.const 1
; W32-NEXT: i32.and
; W32-NEXT: local.tee 1
; W32-NEXT: i32.sub
; W32-NEXT: i32.const 0
; W32-NEXT: local.get 0
; W32-NEXT: i32.const 1
; W32-NEXT: i32.and
; W32-NEXT: local.tee 0
; W32-NEXT: i32.sub
; W32-NEXT: local.get 4
; W32-NEXT: i32.and
; W32-NEXT: local.get 0
; W32-NEXT: i32.const -1
; W32-NEXT: i32.add
; W32-NEXT: local.get 5
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: i32.and
; W32-NEXT: local.get 1
; W32-NEXT: i32.const -1
; W32-NEXT: i32.add
; W32-NEXT: local.get 6
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: i32.and
; W32-NEXT: local.get 2
; W32-NEXT: i32.const -1
; W32-NEXT: i32.add
; W32-NEXT: local.get 7
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: i32.and
; W32-NEXT: local.get 3
; W32-NEXT: i32.const -1
; W32-NEXT: i32.add
; W32-NEXT: local.get 8
; W32-NEXT: i32.and
; W32-NEXT: i32.or
; W32-NEXT: # fallthrough-return
;
; W64-LABEL: test_ctselect_deeply_nested:
; W64: .functype test_ctselect_deeply_nested (i32, i32, i32, i32, i32, i32, i32, i32, i32) -> (i32)
; W64-NEXT: # %bb.0:
; W64-NEXT: i32.const 0
; W64-NEXT: local.get 3
; W64-NEXT: i32.const 1
; W64-NEXT: i32.and
; W64-NEXT: local.tee 3
; W64-NEXT: i32.sub
; W64-NEXT: i32.const 0
; W64-NEXT: local.get 2
; W64-NEXT: i32.const 1
; W64-NEXT: i32.and
; W64-NEXT: local.tee 2
; W64-NEXT: i32.sub
; W64-NEXT: i32.const 0
; W64-NEXT: local.get 1
; W64-NEXT: i32.const 1
; W64-NEXT: i32.and
; W64-NEXT: local.tee 1
; W64-NEXT: i32.sub
; W64-NEXT: i32.const 0
; W64-NEXT: local.get 0
; W64-NEXT: i32.const 1
; W64-NEXT: i32.and
; W64-NEXT: local.tee 0
; W64-NEXT: i32.sub
; W64-NEXT: local.get 4
; W64-NEXT: i32.and
; W64-NEXT: local.get 0
; W64-NEXT: i32.const -1
; W64-NEXT: i32.add
; W64-NEXT: local.get 5
; W64-NEXT: i32.and
; W64-NEXT: i32.or
; W64-NEXT: i32.and
; W64-NEXT: local.get 1
; W64-NEXT: i32.const -1
; W64-NEXT: i32.add
; W64-NEXT: local.get 6
; W64-NEXT: i32.and
; W64-NEXT: i32.or
; W64-NEXT: i32.and
; W64-NEXT: local.get 2
; W64-NEXT: i32.const -1
; W64-NEXT: i32.add
; W64-NEXT: local.get 7
; W64-NEXT: i32.and
; W64-NEXT: i32.or
; W64-NEXT: i32.and
; W64-NEXT: local.get 3
; W64-NEXT: i32.const -1
; W64-NEXT: i32.add
; W64-NEXT: local.get 8
; W64-NEXT: i32.and
; W64-NEXT: i32.or
; W64-NEXT: # fallthrough-return
%sel1 = call i32 @llvm.ct.select.i32(i1 %c1, i32 %a, i32 %b)
%sel2 = call i32 @llvm.ct.select.i32(i1 %c2, i32 %sel1, i32 %c)
%sel3 = call i32 @llvm.ct.select.i32(i1 %c3, i32 %sel2, i32 %d)
%sel4 = call i32 @llvm.ct.select.i32(i1 %c4, i32 %sel3, i32 %e)
ret i32 %sel4
}

; Declare the intrinsics
declare i1 @llvm.ct.select.i1(i1, i1, i1)
declare i32 @llvm.ct.select.i32(i1, i32, i32)
declare ptr @llvm.ct.select.p0(i1, ptr, ptr)
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