handle as best we can surprising types for legalized bitcasts. fixes #701

2 files changed, 27 insertions, 0 deletions

diff --git a/src/analyzer.js b/src/analyzer.js
index fa8aee59..c09739e9 100644
--- a/src/analyzer.js
+++ b/src/analyzer.js
@@ -467,6 +467,12 @@ function analyzer(data, sidePass) {
                       break;
                     }
                     case 'bitcast': {
+                      if (!sourceBits) {
+                        // we can be asked to bitcast doubles or such to integers, handle that as best we can (if it's a double that
+                        // was an x86_fp80, this code will likely break when called)
+                        sourceBits = targetBits = Runtime.getNativeTypeSize(value.params[0].type);
+                        warn('legalizing non-integer bitcast on ll #' + item.lineNum);
+                      }
                       break;
                     }
                     case 'select': {
diff --git a/tests/cases/fp80.ll b/tests/cases/fp80.ll
new file mode 100644
index 00000000..7fc0db4a
--- /dev/null
+++ b/tests/cases/fp80.ll
@@ -0,0 +1,21 @@
+; ModuleID = 'src.cpp.o'
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
+target triple = "i386-pc-linux-gnu"
+
+@.str = private unnamed_addr constant [15 x i8] c"hello, world!\0A\00" ; [#uses=1]
+
+; [#uses=0]
+define i32 @main() {
+entry:
+  %x = zext i32 0 to x86_fp80
+  %1 = bitcast x86_fp80 %x to i80
+  %2 = trunc i80 %1 to i32
+  %retval = alloca i32, align 4                   ; [#uses=1]
+  store i32 0, i32* %retval
+  %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([15 x i8]* @.str, i32 0, i32 0)) ; [#uses=0]
+  ret i32 0
+}
+
+; [#uses=1]
+declare i32 @printf(i8*, ...)
+