SpeculativeExecution: Allow speculating fp ops

[arsenm]

Merge with other patch

lib/Transforms/Scalar/SpeculativeExecution.cpp

switch (Operator::getOpcode(I)) {
     case Instruction::IntToPtr:
     case Instruction::AddrSpaceCast:
     case Instruction::FPToUI:
     case Instruction::FPToSI:
     case Instruction::UIToFP:
     case Instruction::SIToFP:
     case Instruction::FPExt:
     case Instruction::FPTrunc:
+    case Instruction::FAdd:
+    case Instruction::FSub:
+    case Instruction::FMul:
+    case Instruction::FDiv:
+    case Instruction::FRem:
       return TTI.getUserCost(I);
 
     default:
       return UINT_MAX; // Disallow anything not whitelisted.
   }
 }
 
 bool SpeculativeExecutionPass::considerHoistingFromTo(

test/Transforms/SpeculativeExecution/spec-fp.ll

+; RUN: opt < %s -S -speculative-execution \
+; RUN:   -spec-exec-max-speculation-cost 4 -spec-exec-max-not-hoisted 3 \
+; RUN:   | FileCheck %s
+
+; CHECK-LABEL: @ifThen_fadd(
+; CHECK: fadd
+; CHECK: br i1 true
+define void @ifThen_fadd() {
+  br i1 true, label %a, label %b
+
+a:
+  %x = fadd float undef, undef
+  br label %b
+
+b:
+  ret void
+}
+
+; CHECK-LABEL: @ifThen_fsub(
+; CHECK: fsub
+; CHECK: br i1 true
+define void @ifThen_fsub() {
+  br i1 true, label %a, label %b
+
+a:
+  %x = fsub float undef, undef
+  br label %b
+
+b:
+  ret void
+}
+
+; CHECK-LABEL: @ifThen_fneg(
+; CHECK: fsub float -0.0
+; CHECK: br i1 true
+define void @ifThen_fneg() {
+  br i1 true, label %a, label %b
+
+a:
+  %x = fsub float -0.0, undef
+  br label %b
+
+b:
+  ret void
+}
+
+; CHECK-LABEL: @ifThen_fmul(
+; CHECK: fmul
+; CHECK: br i1 true
+define void @ifThen_fmul() {
+  br i1 true, label %a, label %b
+
+a:
+  %x = fmul float undef, undef
+  br label %b
+
+b:
+  ret void
+}
+
+; CHECK-LABEL: @ifThen_fdiv(
+; CHECK: fdiv
+; CHECK: br i1 true
+define void @ifThen_fdiv() {
+  br i1 true, label %a, label %b
+
+a:
+  %x = fdiv float undef, undef
+  br label %b
+
+b:
+  ret void
+}
+
+; CHECK-LABEL: @ifThen_frem(
+; CHECK: frem
+; CHECK: br i1 true
+define void @ifThen_frem() {
+  br i1 true, label %a, label %b
+
+a:
+  %x = frem float undef, undef
+  br label %b
+
+b:
+  ret void
+}