[llvm] Add numerical sanitizer (PR #85916)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,148 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -mtriple=x86_64-linux-gnu -passes=nsan -nsan-shadow-type-mapping=dqq -S %s | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+
+; Tests for invoke instructions that require special handling of the phis.
+
+declare float @may_throw()
+
+declare void @personalityFn()
+
+define float @invoke1() sanitize_numericalstability personality void ()* @personalityFn {
+; CHECK-LABEL: @invoke1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[C:%.*]] = invoke float @may_throw()
+; CHECK-NEXT:    to label [[TMP0:%.*]] unwind label [[LAND:%.*]]
+; CHECK:       0:
+; CHECK-NEXT:    [[TMP1:%.*]] = load i64, ptr @__nsan_shadow_ret_tag, align 8
+; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i64 [[TMP1]], ptrtoint (ptr @may_throw to i64)
+; CHECK-NEXT:    [[TMP3:%.*]] = load double, ptr @__nsan_shadow_ret_ptr, align 8
+; CHECK-NEXT:    [[TMP4:%.*]] = fpext float [[C]] to double
+; CHECK-NEXT:    [[TMP5:%.*]] = select i1 [[TMP2]], double [[TMP3]], double [[TMP4]]
+; CHECK-NEXT:    br label [[CONTINUE:%.*]]
+; CHECK:       continue:
+; CHECK-NEXT:    br label [[EXIT:%.*]]
+; CHECK:       land:
+; CHECK-NEXT:    [[RES:%.*]] = landingpad { ptr, i32 }
+; CHECK-NEXT:    cleanup
+; CHECK-NEXT:    [[LV:%.*]] = uitofp i32 1 to float
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    [[R:%.*]] = phi float [ [[LV]], [[LAND]] ], [ [[C]], [[CONTINUE]] ]
+; CHECK-NEXT:    [[TMP6:%.*]] = phi double [ 1.000000e+00, [[LAND]] ], [ [[TMP5]], [[CONTINUE]] ]
+; CHECK-NEXT:    [[TMP7:%.*]] = call i32 @__nsan_internal_check_float_d(float [[R]], double [[TMP6]], i32 1, i64 0)
+; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i32 [[TMP7]], 1
+; CHECK-NEXT:    [[TMP9:%.*]] = fpext float [[R]] to double
+; CHECK-NEXT:    [[TMP10:%.*]] = select i1 [[TMP8]], double [[TMP9]], double [[TMP6]]
+; CHECK-NEXT:    store i64 ptrtoint (ptr @invoke1 to i64), ptr @__nsan_shadow_ret_tag, align 8
+; CHECK-NEXT:    store double [[TMP10]], ptr @__nsan_shadow_ret_ptr, align 8
+; CHECK-NEXT:    ret float [[R]]
+;
+
+entry:
+  %c = invoke float @may_throw() to label %continue unwind label %land
+
+continue:
+  br label %exit
+
+land:
+  %res = landingpad { i8*, i32 } cleanup
----------------
arsenm wrote:

Needs to use opaque pointers 

https://github.com/llvm/llvm-project/pull/85916