[llvm] [WebAssembly] Legalize i128 to v16i8 for setcc (PR #149461)

[Jasmine Tang via llvm-commits]

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@@ -0,0 +1,89 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s  -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -mattr=+simd128 | FileCheck %s
+
+target triple = "wasm32-unknown-unknown"
+
+declare i32 @memcmp(ptr, ptr, i32)
+
+define i1 @setcc_load(ptr %a, ptr %b) {
+; CHECK-LABEL: setcc_load:
+; CHECK:         .functype setcc_load (i32, i32) -> (i32)
+; CHECK-NEXT:  # %bb.0:
+; CHECK-NEXT:    v128.load $push1=, 0($0):p2align=0
+; CHECK-NEXT:    v128.load $push0=, 0($1):p2align=0
+; CHECK-NEXT:    i8x16.eq $push2=, $pop1, $pop0
+; CHECK-NEXT:    i8x16.all_true $push3=, $pop2
+; CHECK-NEXT:    i32.eqz $push4=, $pop3
+; CHECK-NEXT:    return $pop4
+  %cmp_16 = call i32 @memcmp(ptr %a, ptr %b, i32 16)
+  %res = icmp eq i32 %cmp_16, 0
+  ret i1 %res
+}
+
+; INFO: Negative test: noimplicitfloat disables simd
+define i1 @setcc_load_should_not_vectorize(ptr %a, ptr %b) noimplicitfloat {
+; CHECK-LABEL: setcc_load_should_not_vectorize:
+; CHECK:         .functype setcc_load_should_not_vectorize (i32, i32) -> (i32)
+; CHECK-NEXT:  # %bb.0:
+; CHECK-NEXT:    i64.load $push4=, 0($0):p2align=0
+; CHECK-NEXT:    i64.load $push3=, 0($1):p2align=0
+; CHECK-NEXT:    i64.xor $push5=, $pop4, $pop3
+; CHECK-NEXT:    i64.load $push1=, 8($0):p2align=0
+; CHECK-NEXT:    i64.load $push0=, 8($1):p2align=0
+; CHECK-NEXT:    i64.xor $push2=, $pop1, $pop0
+; CHECK-NEXT:    i64.or $push6=, $pop5, $pop2
+; CHECK-NEXT:    i64.eqz $push7=, $pop6
+; CHECK-NEXT:    return $pop7
+  %cmp_16 = call i32 @memcmp(ptr %a, ptr %b, i32 16)
+  %res = icmp eq i32 %cmp_16, 0
+  ret i1 %res
+}
+
+define i1 @setcc_eq_const_i128(ptr %ptr) {
+; CHECK-LABEL: setcc_eq_const_i128:
+; CHECK:         .functype setcc_eq_const_i128 (i32) -> (i32)
+; CHECK-NEXT:  # %bb.0:
+; CHECK-NEXT:    v128.load $push0=, 0($0)
+; CHECK-NEXT:    v128.const $push1=, 6, 0
+; CHECK-NEXT:    i8x16.eq $push2=, $pop0, $pop1
+; CHECK-NEXT:    i8x16.all_true $push3=, $pop2
+; CHECK-NEXT:    i32.eqz $push4=, $pop3
+; CHECK-NEXT:    return $pop4
+  %l = load i128, ptr %ptr
+  %res = icmp eq i128 %l, 6
+  ret i1 %res
+}
+
+define i1 @setcc_ne_const_i128(ptr %ptr) {
+; CHECK-LABEL: setcc_ne_const_i128:
+; CHECK:         .functype setcc_ne_const_i128 (i32) -> (i32)
+; CHECK-NEXT:  # %bb.0:
+; CHECK-NEXT:    v128.load $push0=, 0($0)
+; CHECK-NEXT:    v128.const $push1=, 16, 0
+; CHECK-NEXT:    i8x16.ne $push2=, $pop0, $pop1
+; CHECK-NEXT:    i8x16.all_true $push3=, $pop2
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badumbatish wrote:

ah yes, ty for the catch Luke!

https://github.com/llvm/llvm-project/pull/149461