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Subzero: Improve register availability peephole for function return values. · deb5a825Jim Stichnoth authored
Originally, a call instruction was lowered like this: // %result = call @foo(...) %t1:eax = call foo %result = %t1:eax Because t1 is pre-colored, it is not available as a substitution if the following instruction uses %result as a source operand. To improve this, we copy it through an intermediate temporary: // %result = call @foo(...) %t1:eax = call foo %t2 = %t1:eax %result = %t2 BUG= none R=eholk@chromium.org Review URL: https://codereview.chromium.org/2064073005 .
deb5a825
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