1 files changed, 37 insertions, 0 deletions
diff --git a/test/CodeGen/X86/fastisel-gep-promote-before-add.ll b/test/CodeGen/X86/fastisel-gep-promote-before-add.ll
new file mode 100644
index 0000000000000..f87a34c4abde1
--- /dev/null
+++ b/test/CodeGen/X86/fastisel-gep-promote-before-add.ll
@@ -0,0 +1,37 @@
+; fastisel should not fold add with non-pointer bitwidth
+; sext(a) + sext(b) != sext(a + b)
+; RUN: llc -mtriple=x86_64-apple-darwin %s -O0 -o - | FileCheck %s
+
+define zeroext i8 @gep_promotion(i8* %ptr) nounwind uwtable ssp {
+entry:
+  %ptr.addr = alloca i8*, align 8
+  %add = add i8 64, 64 ; 0x40 + 0x40
+  %0 = load i8** %ptr.addr, align 8
+
+  ; CHECK-LABEL: _gep_promotion:
+  ; CHECK: movzbl ({{.*}})
+  %arrayidx = getelementptr inbounds i8* %0, i8 %add
+
+  %1 = load i8* %arrayidx, align 1
+  ret i8 %1
+}
+
+define zeroext i8 @gep_promotion_nonconst(i8 %i, i8* %ptr) nounwind uwtable ssp {
+entry:
+  %i.addr = alloca i8, align 4
+  %ptr.addr = alloca i8*, align 8
+  store i8 %i, i8* %i.addr, align 4
+  store i8* %ptr, i8** %ptr.addr, align 8
+  %0 = load i8* %i.addr, align 4
+  ; CHECK-LABEL: _gep_promotion_nonconst:
+  ; CHECK: movzbl ({{.*}})
+  %xor = xor i8 %0, -128   ; %0   ^ 0x80
+  %add = add i8 %xor, -127 ; %xor + 0x81
+  %1 = load i8** %ptr.addr, align 8
+
+  %arrayidx = getelementptr inbounds i8* %1, i8 %add
+
+  %2 = load i8* %arrayidx, align 1
+  ret i8 %2
+}
+