Subzero: Decorate the text asm output with register availability info.
The -asm-verbose flag adds comments to the text asm output about register availability. Specifically, it prints the registers in use at the beginning and end of each block, and it prints which registers' live ranges end at each instruction.
This is extremely helpful when studying the output to find opportunities to improve the code quality.
BUG= none
R=jvoung@chromium.org
Review URL: https://codereview.chromium.org/682983004
diff --git a/src/IceTargetLowering.h b/src/IceTargetLowering.h
index 7aa2483..4bfe4b4 100644
--- a/src/IceTargetLowering.h
+++ b/src/IceTargetLowering.h
@@ -153,6 +153,7 @@
return false;
}
+ virtual SizeT getNumRegisters() const = 0;
// Returns a variable pre-colored to the specified physical
// register. This is generally used to get very direct access to
// the register such as in the prolog or epilog or for marking